Ruzhong Zuo

Hefei University of Technology, Luchow, Anhui Sheng, China

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Publications (139)313.53 Total impact

  • Tianwen Zhang, Ruzhong Zuo, Chen Zhang
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    ABSTRACT: In this work, the (1 − x)Li3(Mg0.92Zn0.08)2NbO6–xBa3(VO4)2 (x = 0.1–0.35) ceramics were prepared via a conventional solid state reaction route. The phase composition, microstructure and microwave dielectric properties were investigated by an X-ray diffractometer (XRD), a scanning electron microscope and a network analyzer. The XRD results indicated that the Li3(Mg0.92Zn0.08)2NbO6 and Ba3(VO4)2 phases could well coexist without forming any secondary phases. The dielectric constant (ϵr) and quality factor (Q × f) values of the Li3(Mg0.92Zn0.08)2NbO6 ceramic decreased with the addition of Ba3(VO4)2 phase, however its temperature coefficient of resonant frequency (τf) value was improved significantly. Excellent microwave dielectric properties of ϵr ∼ 16.3, Q × f ∼ 50,084 GHz (at 8.64 GHz) and τf ∼ 1.5 ppm/°C were achieved for the x = 0.3 sample when sintered at 950 °C for 4 h. The chemical compatibility with Ag electrode indicated that the 0.7Li3(Mg0.92Zn0.08)2NbO6–0.3Ba3(VO4)2 composite ceramic would be a promising material for the low temperature cofired ceramic applications.
    Materials Research Bulletin 08/2015; 68. DOI:10.1016/j.materresbull.2015.03.022 · 1.97 Impact Factor
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    ABSTRACT: The influence of the addition of low-melting point Li2O-B2O3-SiO2 (LBS) on the sintering behavior and microwave dielectric properties of commercial 0.95MgTiO3-0.05CaTiO3 (95MCT) was systematically investigated by means of an X-ray diffractometer, a scanning electron microscope and a network analyzer. The results revealed that the addition of an appropriate amount of LBS enables the 95MCT composite ceramic to sinter in an obviously low sintering temperature, simultaneously leading to a more uniform and compact microstructure. Furthermore, favorable microwave dielectric properties of εr = 18.2, Qxf = 67,000 GHz (7.9 GHz), τf = −5.2 ppm/°C) were yielded in the 10 wt% LBS-doped 95MCT sample when sintered at 1025 °C for 4 h, indicating that LBS is an effective ternary firing agent when employed in 95MCT system. The relatively low sintering temperature together with acceptable microwave dielectric properties enable the composite ceramic to be a more potential alternative for the present patch antennas.
    Journal of Materials Science Materials in Electronics 01/2015; DOI:10.1007/s10854-015-3008-1 · 1.97 Impact Factor
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    Wanli Zhao, Ruzhong Zuo, Jian Fu
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    ABSTRACT: Large electrostrains (∼0.4% at 7 kV/mm) of the new (0.7 − x)Bi(Mg1/2Ti1/2)O3–xPb(Mg1/3Nb2/3)O3–0.3PbTiO3 ((0.7 − x)BMT–xPMN–0.3PT) ceramics with x = 0.0–0.7 near the morphotropic phase boundary of the BMT–PT–PMN ternary system were found to be associated with the evolution of the compositionally modulated dielectric relaxor behavior. As disclosed by in situ high-resolution synchrotron X-ray diffraction, more intermediate phases of different symmetries induced by external fields largely contribute to smaller strain hysteresis (∼23%) of PMN-rich compositions than BMT-rich ones. Particularly, the x = 0.2 sample exhibits temperature-insensitive electrostrains of ∼0.3% at 5 kV/mm varying less than 10% from room temperature up to 160 °C, which is mainly attributed to the coexistence of two kinds of relaxor states in a broad temperature range owing to special static domain structures typical for BMT-rich compositions. These findings provide a new approach toward an appropriate compositional design for low-hysteresis temperature-insensitive large electrostrains in BMT-based relaxor ferroelectrics.
    Journal of the European Ceramic Society 12/2014; 34(16):4235–4245. DOI:10.1016/j.jeurceramsoc.2014.07.017 · 2.31 Impact Factor
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    ABSTRACT: We report a series of ReVO4 (Re = La, Ce) microwave dielectric ceramics fabricated by a standard solid-state reaction method. X-ray diffraction and scanning electron microscopy measurements were performed to explore the phase purity, sintering behavior, and microstructure. The analysis revealed that pure and dense monoclinic LaVO4 ceramics with a monazite structure and tetragonal CeVO4 ceramics with a zircon structure could be obtained in their respective sintering temperature range. Furthermore, LaVO4 and CeVO4 ceramics sintered at 850°C and 950°C for 4 h possessed out-bound microwave dielectric properties: εr = 14.2, Q × f = 48197 GHz, τf = −37.9 ppm/°C, and εr = 12.3, Q × f = 41 460 GHz, τf = −34.4 ppm/°C, respectively. The overall results suggest that the ReVO4 ceramics could be promising materials for low-temperature-cofired ceramic technology.
    Journal of the American Ceramic Society 12/2014; DOI:10.1111/jace.13378 · 2.43 Impact Factor
  • Tianwen Zhang, Ruzhong Zuo
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    ABSTRACT: The effect of Zn2+ substitution on the structure and microwave dielectric properties of Li3Mg2NbO6 ceramic was investigated. The compositions of Li3(Mg1−xZnx)2NbO6 (0≤x≤0.1) ceramics were prepared by the solid-state reaction method. The phase structure, microstructure and microwave dielectric properties of Li3(Mg1−xZnx)2NbO6 ceramics were analyzed via an X-ray diffraction, a scanning electron microscope as well as a network analyzer. All samples sintered at 1080-1240 °C for 4 h remained a single orthorhombic structure, which could be indexed according to the Li3Mg2NbO6 phase (JCPDS-PDF #86-0346). The microwave dielectric properties of Li3(Mg1−xZnx)2NbO6 ceramics exhibited significant dependence on the sintering condition, microstructure and composition. Excellent microwave dielectric properties (εr~17.2, Q×f~142,331 GHz, τf~−23.2 ppm/°C) were obtained in the x=0.08 sample sintered at 1120 °C for 4 h in air. In addition, the 0.17Li2O-0.83V2O5 composition was added as a sintering aid to lower the sintering temperature. The 0.5 wt% 0.17Li2O-0.83V2O5 added Li3(Mg0.92Zn0.08)2NbO6 ceramic showed fairly good microwave dielectric properties of εr~14, Q×f~83,395 GHz, τf~−37.2 ppm/°C when sintered at 925 °C for 2 h. Furthermore, there was no chemical reaction between Ag electrode and the sintering aid added sample, which further demonstrates that the Li3(Mg0.92Zn0.08)2NbO6 ceramic modified with 0.17Li2O-0.83V2O5 would be a promising candidate material for low-temperature cofired ceramic (LTCC) applications.
    Ceramics International 12/2014; 40(10):15677-15684. DOI:10.1016/j.ceramint.2014.07.090 · 2.09 Impact Factor
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    ABSTRACT: The crystal structure, microstructure, and microwave dielectric properties of forsterite-based (Mg1–xNix)2SiO4 (x = 0.02–0.20) ceramics were systematically investigated. All samples present a single forsterite phase of an orthorhombic structure with a space group Pbnm except for a little MgSiO3 secondary phase as x > 0.08. Lattice parameters in all axes decrease linearly with increasing Ni content due to the smaller ionic radius of Ni2+ compared to Mg2+. The substitution of an appropriate amount of Ni2+ could greatly improve the sintering behavior and produce a uniform and closely packed microstructure of the Mg2SiO4 ceramics such that a superior Q × f value (152 300 GHz) can be achieved as x = 0.05. The τf value was found to increase with increasing A-site ionic bond valences. In addition, various additives were used as sintering aids to lower the sintering temperature from 1500°C to the middle sintering temperature range. Excellent microwave dielectric properties of εr~6.9, Q × f~99800 GHz and τf~−50 ppm/°C can be obtained for 12 wt% Li2CO3-V2O5-doped (Mg0.95Ni0.05)2SiO4 ceramics sintered at 1150°C for 4 h.
    Journal of the American Ceramic Society 11/2014; 98(3). DOI:10.1111/jace.13347 · 2.43 Impact Factor
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    ABSTRACT: New lead-free perovskite solid solution ceramics of (1 − x)(Bi1/2Na1/2)TiO3–xBa(Ni1/2Nb1/2)O3[(1−x)BNT–xBNN,x = 0.02–0.06) were prepared and their dielectric, ferroelectric, piezoelectric, and electromechanical properties were investigated as a function of the BNN content. The X-ray diffraction results indicated that the addition of BNN has induced a morphotropic phase transformation from rhombohedral to pseudocubic symmetry approximately at x = 0.045, accompanying an evolution of dielectric relaxor behavior as characterized by enhanced dielectric diffuseness and frequency dispersion. In the proximity of the ferroelectric rhombohedral and pseudocubic phase coexistence zone, the x = 0.045 ceramics exhibited optimal piezoelectric and electromechanical coupling properties of d33~121 pC/N and kp~0.27 owing to decreased energy barriers for polarization switching. However, further addition of BNN could cause a decrease in freezing temperatures of polar nanoregions till the coexistence of nonergodic and ergodic relaxor phases occurred near room temperature, especially for the x = 0.05 sample which has negligible negative strains and thus show the maximum electrostrain of 0.3% under an external electric field of 7 kV/mm, but almost vanished piezoelectric properties. This was attributed to the fact that the induced long-range ferroelectric order could reversibly switch back to its original ergodic state upon removal of external electric fields.
    Journal of the American Ceramic Society 11/2014; 98(3). DOI:10.1111/jace.13363 · 2.43 Impact Factor
  • Shengbo Lu, Zhengkui Xu, Ruzhong Zuo
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    ABSTRACT: The effect of domain structures on the piezoelectric properties of three typical lead-free piezoelectric ceramics, (1-x)Bi0.5Na0.5TiO3-xBa-TiO3 (Na0.52K0.48-x)(Nb0.95-xTa0.05)O-3-xLiSbO(3) and 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3, have been studied by transmission electron microscopy. By adding BaTiO3 in single phase Bi0.5Na0.5TiO3, domain structure changed from irregular domains into submicron lamellar domains and polar nano-regions. While in the later two system, regular submicron domains with nanodomains inside formed, which is an important feature of these two systems. It is suggested that the changes in domain structures in these systems have a dominant effect in the enhancement of the piezoelectric properties, comparing with single phase Bi0.5Na0.5TiO3, Na0.5K0.5NbO3 and BaTiO3.
    Ceramics International 09/2014; 40(8):13565-13571. DOI:10.1016/j.ceramint.2014.05.070 · 2.09 Impact Factor
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    Wanli Zhao, Ruzhong Zuo, Jian Fu, Min Shi
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    ABSTRACT: A composition-induced pseudocubic–tetragonal structural transition was found to be accompanied by a relaxor phase transformation in xBi(Mg0.5Ti0.5)O3–(0.75 − x)PbTiO3–0.25(Bi0.5Na0.5)TiO3 ternary solid solutions. Dielectric and ferroelectric measurements suggest the coexistence of ergodic and nonergodic relaxor phases within a single pseudocubic phase zone for samples with 0.50 < x < 0.51 where large electromechanical strains of up to 0.43% (Smax/Emax = 621 pm/V) can be generated. The mechanism was mainly ascribed to the accumulated effects of field-modulated continuous and reversible transformations from a pseudocubic ergodic phase to a rhombohedral short-range ordered phase (but not nonergodic polar phase), and finally to a long-range ordered ferroelectric tetragonal phase. These procedures were found to be strongly dependent on the applied field magnitudes. These findings were reasonably approved by a couple of measurements such as dielectric–temperature–frequency spectrum, ferroelectric polarization/strain hysteresis loops, polarization current density curves and particularly ex situ Raman spectrum and in situ high-resolution synchrotron X-ray diffraction.
    Journal of the European Ceramic Society 09/2014; 34(10):2299–2309. DOI:10.1016/j.jeurceramsoc.2014.01.040 · 2.31 Impact Factor
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    ABSTRACT: This paper reports the experimental determination of the uniaxial viscosity for ceramic tapes made of three commercially available low-temperature cofired ceramic (LTCC), DuPont 951 (glass-ceramic), Ferro A6M (glass) and Yinfeng 8.5 (glass) by utilizing a novel vertical sintering in an optical dilatometer. The green tapes were vertically sintered at different isothermal temperatures ranging from 760 °C to 820 °C under their own weights. The densification behavior was systematically investigated through the measured sintering strains and the uniaxial viscosity was determined as a function of relative density based on a theoretical equation developed for ceramic tapes. The calculated uniaxial viscosities were compared with a previously reported model and good agreements were achieved. The activation energy for the uniaxial viscosity was found to be independent of the relative density and showed an average value of 290±47 kJ/mol for the DuPont tapes but was not accessible currently for the other glass-based LTCC tapes.
    Ceramics International 08/2014; 40(7):9367-9375. DOI:10.1016/j.ceramint.2014.02.004 · 2.09 Impact Factor
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    ABSTRACT: 2-2 Type layered CFO/PZT (CoFe2O4/Pb(Zr0.52Ti0.48)O3) magnetoelectric composite films with four different structures were prepared on Pt/Ti/SiO2/Si substrates via a sol-gel method. These films annealed at 700 °C contain PZT and CFO phase without impurity phases. The prepared composite films exhibit 2-2 type layered structures with obvious interfaces and no diffusions exist between CFO and PZT films. Ferromagnetic and ferroelectric responses were simultaneously observed in the composite films. These composite films exhibit good magnetoelectric coupling effects and the magnetoelectric voltage coefficients (αE) increase with increasing the volume contents of CFO films in composite films. The αE value of composite film (2PZT/4CFO/2PZT/4CFO/2PZT) reaches a maximum (227 mV cm−1 Oe−1) among all the prepared composite films.
    Ceramics International 08/2014; 40(7):9249-9256. DOI:10.1016/j.ceramint.2014.01.146 · 2.09 Impact Factor
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    Shengbo Lu, Zhengkui Xu, Shi Su, Ruzhong Zuo
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    ABSTRACT: Hierarchical micro- and nanoscale domain structures in Pb-free Ba(Zr0.2Ti0.8)O-3-50(Ba0.7Ca0.3)TiO3 piezoceramics were investigated by transmission electron microscopy. In situ heating and cooling studies of domain structure evolution reveal an irreversible domain transformation from a wedge-shaped rhombohedral nanodomain structure to a lamellar tetragonal domain structure, which could be associated with strong piezoelectricity in Ba(Zr0.2Ti0.8)O-3-50(Ba0.7Ca0.3)TiO3 piezoceramics. (c) 2014 AIP Publishing LLC.
    Applied Physics Letters 07/2014; 105(3):032903-032903-4. DOI:10.1063/1.4891756 · 3.52 Impact Factor
  • Feng Li, Ruzhong Zuo
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    ABSTRACT: The 1–3 piezocomposites based on 0.96Bi0.5(Na0.84K0.16)0.5TiO3–0.04SrTiO3 (BNKT–ST) were fabricated by a modified dice-fill method. Electro-mechanical properties of the composites as a function of the ceramic volume fraction (v) were measured and compared with theoretical values as well as with those of monolithic ceramics. The as-prepared piezocomposite with v = 0.276 showed a clear single thickness mode with a relatively high resonance frequency of more than 2 MHz, together with a relatively high piezoelectric strain constant (d 33 ~ 104 pC/N), a high thickness coupling coefficient (k t ~ 0.547), low acoustic impedance (Z ~ 9 Mrayls) and a large piezoelectric voltage coefficient (g 33 ~ 91.5 × 10−3 m2/C). From the practical application point of view, these promising results indicate that the BNKT–ST ceramic/epoxy 1–3 composite has great potential to be used in biomedical ultrasonic transducers as well as nondestructive evaluations.
    Journal of Materials Science Materials in Electronics 06/2014; 25(6):2730-2736. DOI:10.1007/s10854-014-1936-9 · 1.97 Impact Factor
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    ABSTRACT: In this paper, we report a novel nanocomposite of graphene nanocluster decorated Nb2O5 nanofibers. With the structural modification, the photocatalytically active region of Nb2O5 has been significantly extended from the UV region to the UV-Vis region (from 380 nm to 800 nm in the adsorption edge); and hence, the visible light photocatalytic performance has been greatly improved. Detailed structural analysis revealed that the enhanced photocatalytic activity of the graphene nanocluster decorated Nb2O5 nanofibers could be mainly attributed to the modification of the bandgaps by the clusters and the unique orientation of graphene layers (nearly perpendicular to the Nb2O5/C interface, which is quite different from classical “core–shell” composites). We believe that the findings suggest a potential candidate for visible-light photocatalytic applications and would inspire further studies.
    05/2014; 2(22). DOI:10.1039/C4TA00365A
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    Wanli Zhao, Ruzhong Zuo, Feng Li, Longtu Li
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    ABSTRACT: The structural, dielectric, ferroelectric, strain properties of (0.89 − x)Bi(Mg0.5Ti0.5)O3–xPbTiO3–0.11CaZrO3 ceramics (x = 0.45–0.55) were investigated. A morphotropic phase boundary between rhombohedral relaxor and tetragonal normal ferroelectric phases was identified in the composition range of 0.49 < x < 0.51. Moreover, a phase transition from ergodic to nonergodic relaxor states was noticed in the composition range of 0.45 < x < 0.51 with increasing the PbTiO3 content, during which a giant electric field induced strain (∼0.32%, d33*∼640pm/V) was observed in the proximity of x = 0.48. Such a giant strain is believed to originate from the field induced reversible phase transformation between ergodic relaxor and the long-range ferroelectric phase and this was further confirmed by the measurements of the temperature-dependent ferroelectric polarization/strain loops.
    Journal of Alloys and Compounds 04/2014; 591:218–223. DOI:10.1016/j.jallcom.2013.12.229 · 2.73 Impact Factor
  • Haifeng Yi, Ruzhong Zuo
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    ABSTRACT: Perovskite-type xBi(Mg1/2Ti1/2)O3–(0.56 − x)PbZrO3–0.44PbTiO3 (xBMT–PZ–PT) ternary solid solution ceramics were synthesized via a conventional solid-state reaction method. The phase transition behaviors, dielectric, ferroelectric, and piezoelectric properties were investigated as a function of the BMT content. The X-ray diffraction analysis showed that the tetragonality of xBMT–PZ–PT was enhanced with increasing the BMT content, and a morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases was identified approximately in the composition of x = 0.08. In addition, the dielectric diffuseness and frequency dispersion behavior were induced with the addition of BMT and a normal-relaxor-diffuse ferroelectric transformation was observed from the PZ-rich side to the BMT-rich side. The electrical properties of xBMT–PZ–PT ceramics exhibit obviously compositional dependence. The x = 0.08 composition not only possessed the optimum properties with εT33/ε0 = 1450, Qm = 69, d33 = 390 pC/N, kp = 0.46, Pr = 30 μC/cm2, Ec = 1.4 kV/mm, Tc = 325°C, and a strain of 0.174% (d33* = 436 pm/V) under an electric field of 4 kV/mm as a result of the coexistence of two ferroelectric phases near the MPB, but also owned a good thermal-depolarization behavior with a d33 value of >315 pC/N up to 290°C and a frequency-insensitive strain behavior.
    Journal of the American Ceramic Society 03/2014; 97(6). DOI:10.1111/jace.12874 · 2.43 Impact Factor
  • Yi Liu, Ruzhong Zuo, Shishun Qi
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    ABSTRACT: Bi2Fe4O9 powders with different morphology and particle size have been prepared via surfactant-free solvothermal route with water and water–ethanol mixed solvents. The as-synthesized samples were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and UV–vis spectroscopy. The effect of the solvent on the morphology of Bi2Fe4O9 crystals and the formation process of rod-like microrods and defective crystals were investigated. Rod-like and cubic shape Bi2Fe4O9 crystals could be easily obtained by changing the volume ratios of H2O/EtOH. The results indicate that the rod-like Bi2Fe4O9 crystals could be formed in the more ionic solvent, and the anisotropic nature of the crystal structure may be responsible for the formation of rod-shape. In addition, the optical properties and photocatalytic activity of the Bi2Fe4O9 samples were investigated. The lower photocatalytic activity of Bi2Fe4O9 microrods could be attributed to their larger particle size, smaller specific surface areas and smaller bandgap.
    Powder Technology 03/2014; 254:30–35. DOI:10.1016/j.powtec.2014.01.013 · 2.27 Impact Factor
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    ABSTRACT: The 0.45Bi(Mg0.5Ti0.5)O3–(0.55 − x)PbTiO3–x(Bi0.5Na0.5)TiO3 (BMT–PT–xBNT) ternary solid solution ceramics were prepared via a conventional solid-state reaction method; the evolution of dielectric relaxor behavior and the electrostrain features were investigated. The XRD and dielectric measurements showed that all studied compositions own a single pseudocubic perovskite structure and undergo a diffuse-to-relaxor phase transition owing to the evolution of the domain from a frozen state to a dynamic state. The formation of the above dielectric relaxor behavior was further confirmed by a couple of measurements such as polarization loops, polarization current density curves, as well as bipolar strain loops. A large strain value of ~0.41% at a driving field of 7 kV/mm (normalized strain d33* of ~590 pm/V) was obtained at room temperature for the composition with x = 0.32, which is located near the boundary between ergodic and nonergodic relaxor. Moreover, this electric field-induced large strain was found to own a frequency-insensitive characteristic.
    Journal of the American Ceramic Society 02/2014; 97(6). DOI:10.1111/jace.12841 · 2.43 Impact Factor
  • Yang Lv, Ruzhong Zuo, Ying Cheng, Chen Zhang
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    ABSTRACT: The novel low-temperature sinterable (1 − x)Ba3(VO4)2–xLiMg0.9Zn0.1PO4 microwave dielectric ceramics were prepared by cofiring the mixtures of pure-phase Ba3(VO4)2 and LiMg0.9Zn0.1PO4. The phase structure and grain morphology of the ceramics were evaluated using X-ray diffraction, Raman spectra, and scanning electron microscopy. The results indicated that Ba3(VO4)2 and LiMg0.9Zn0.1PO4 phases can well coexist in the sintered body. Nevertheless, a small amount of LiZnPO4 and some vanadate phases with low melting points were observed, which not only can influence the microwave dielectric properties of the ceramic but also can obviously improve the densification behavior at a relatively low sintering temperature. The near-zero temperature coefficients of the resonant frequency (τf) could be achieved by adjusting the relative content of the two phases owing to their opposite τf values and simultaneously a desirable quality factor Q × f value can be maintained. No chemical reaction between the matrix ceramic phase and Ag took place after sintering at 800°C for 4 h. The ceramics with 45 vol% LiMg0.9Zn0.1PO4 can be well sintered at only 800°C and exhibit excellent microwave dielectric properties of εr ~ 10, Q × f ~ 64 500 GHz, and τf ~ −2.1 ppm/°C, thus showing a great potential as a low-permittivity low-temperature cofired microwave dielectric material.
    Journal of the American Ceramic Society 12/2013; 96(12). DOI:10.1111/jace.12613 · 2.43 Impact Factor
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    Wanli Zhao, Ruzhong Zuo
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    ABSTRACT: Lead-free relaxor ferroelectric ceramics (1−x)(K 0.5 Bi 0.5)TiO 3 –xBi(Ni 0.5 Ti 0.5)O 3 were prepared by a conventional solid-state route, the phase transition behavior and corresponding electrical properties were investigated. A typical morphotropic phase boundary (MPB) between rhombohedral and tetragonal ferroelectric phases was identified to be in the range of 0.05 ox o 0.07 where the optimum piezoelectric and electromechanical properties of d 33 ¼126 pC/N and k P ¼ 18% were achieved. Most importantly, a high Curie temperature 320 1C, around which the material shows a typical relaxor ferroelectric behavior characterized by the presence of diffuse phase transition and frequency dispersion, was obtained in MPB compositions, significantly higher than those of some existing MPB lead-free titanate systems. These results demonstrate a tremendous potential of the studied system for device applications. &
    Ceramics International 12/2013; 39:9121-9124. DOI:10.1016/j.ceramint.2013.05.009 · 2.09 Impact Factor

Publication Stats

1k Citations
313.53 Total Impact Points

Institutions

  • 2007–2014
    • Hefei University of Technology
      • School of Materials Science and Engineering
      Luchow, Anhui Sheng, China
  • 2003–2008
    • Technical University Darmstadt
      • Research Area of Materials Science
      Darmstadt, Hesse, Germany
  • 2000
    • Tsinghua University
      • State Key Laboratory of New Ceramics and Fine Processing
      Peping, Beijing, China