Ruzhong Zuo

Hefei University of Technology, Hefei, Anhui Sheng, China

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Publications (127)202.05 Total impact

  • 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. · 2.36 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; · 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; · 2.43 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.
    J. Mater. Chem. A. 05/2014; 2(22).
  • 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. · 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; · 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. · 2.50 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; · 2.43 Impact Factor
  • 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 01/2014; 34(10):2299–2309. · 2.36 Impact Factor
  • Source
    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)O3-50(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)O3-50(Ba0.7Ca0.3)TiO3 piezoceramics.
    Applied Physics Letters 01/2014; 105(3):032903-032903-4. · 3.52 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). · 2.43 Impact Factor
  • Yi Liu, Ruzhong Zuo
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    ABSTRACT: Submicron-sized Bi2Fe4O9 crystals were successfully synthesized via the hydrothermal method, while micron-sized Bi2Fe4O9 crystals with rod-like morphologies were obtained in the presence of the mineralizer KNO3. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were employed to characterize the products. According to a series of time-dependent experiments, it was concluded that the likeliest formation mechanism for the microrods was the Ostwald ripening process. It was proposed that the blocking effect of NO3− contributed to the formation of the rod-like powders. Moreover, the optical absorption of the prepared Bi2Fe4O9 crystals was measured using an UV–vis spectrophotometer, indicating that Bi2Fe4O9 powders can be used as effective photocatalysts under visible light.
    Particuology 10/2013; 11(5):581–587. · 1.42 Impact Factor
  • Yang Lv, Ruzhong Zuo, Zhenxing Yue
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    ABSTRACT: Microwave dielectric ceramic composites with compositions of (1 − y)Ba3(VO4)2–yZn2−xSiO4−x (y = 0.4–0.6, x = 0.13) have been prepared by firing mixtures of Ba3(VO4)2 and Zn1.87SiO3.87. The X-ray diffraction (XRD) analysis revealed that Zn2SiO4 with a willemite phase can be obtained by appropriately controlling the ZnO deficiency. The starting Zn1.87SiO3.87 powder should be thus composed of the ZnSiO4 crystal phase and redundant SiO2 amorphous phase at room temperature. The scanning electron microscopy studies demonstrated the coexistence of Zn2SiO4 and Ba3(VO4)2 phases in the sintered bodies, as further confirmed by the XRD and Raman results. 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. The existence of a slight amount of secondary phases, element interdiffusion and non-stoichiometry such as Zn deficiency altogether made the predicted property values deviate from the experimentally measured ones. The composite ceramics with 40 wt% Zn1.87SiO3.87 sintered at 1100 °C exhibited desirable microwave dielectric properties of the quality factor Q × f ∼ 23,000 GHz, dielectric constant ɛr ∼ 9.3, and τf ∼ 0.4 ppm/°C.
    Materials Research Bulletin. 06/2013; 48(6):2011–2017.
  • Jian Fu, Ruzhong Zuo
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    ABSTRACT: Extremely enhanced electrostrains (up to 0.39%) were surprisingly observed in (0.67 − x)Bi(Mg0.5Ti0.5)O3–xPbZrO3–0.33PbTiO3 (BMT–xPZ–PT) ternary solid solutions, possibly resulting in BMT–xPZ–PT ceramics having great potential for large-displacement actuator applications. The generation of giant strains was found to be closely associated with the evolution of a weak relaxor behavior from diffuse-type BMT–PT binary ferroelectrics, during which the domain switching is actively facilitated owing to a change in the dynamics of the polar nanoregions from a static state to a dynamic state. It can be also attributed to a ferroelectric nature of the evolved relaxors in PZ substituted BMT–PT ceramics instead of a dipole glass freezing state. These judgements were reasonably supported by a couple of measurements, including strains vs. electric field, Raman scattering, dielectric spectroscopy and the time- and electric-field-dependent polarization. The present study can provide a general approach towards an appropriate compositional design for large electrostrains in BMT-based and related systems.
    Acta Materialia. 06/2013; 61(10):3687–3694.
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    ABSTRACT: Lead-free thin films of (Ba0.9Ca0.1)(Ti0.9Zr0.1)O3 (BCZT) were prepared on Pt/Ti/SiO2/Si substrates by using sol–gel under three different annealing processes. Under the complex annealing process (CAP), the thin film is composed of a single phase with no trace of secondary phases, well crystallized and has a preferred orientation of (1 0 0). The thin film exhibits homogeneous polycrystalline grains without cracks and pores. The surface of the thin film has smooth surface with a root-mean-square (RMS) roughness of 5.67 nm. The interface between the thin film and the substrate is clear and smooth. The dielectric constant and the remnant polarization of the thin film prepared under CAP are greater than those prepared under the other annealing processes. But the dielectric loss and the coercive field are smaller. These results indicate that, among the three annealing processes, CAP is the best for preparing thin film of BCZT with good properties.
    Journal of Alloys and Compounds 06/2013; 562:116–122. · 2.73 Impact Factor
  • Journal of Materials Science 06/2013; 48(11):4143-4150. · 2.31 Impact Factor
  • Source
    Longdong Liu, Ruzhong Zuo, Qi Liang
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    ABSTRACT: High Curie-temperature 0.63Bi(Mg1/2Ti1/2)O3–0.37PbTiO3 (BMT–PT) films were fabricated on Pt(111)/Ti/SiO2/Si substrates by the sol–gel spin-coating method. The oriented growth behavior of thin films was controlled by introducing a PT seed layer onto the platinum electrode surface. The effect of the annealing method of the PT seed layer on the orientation behavior and electrical properties of BMT–PT films was investigated. It was found that BMT–PT thin film exhibits higher (100) orientation degree when the PT seed layer was treated by rapid thermal annealing. The dielectric permittivity increases while the remanent polarization and coercive field decrease with increasing the (100) orientation degree. These results were explained according to the relationship between the preferential orientation and the spontaneous polarization directions of the films.
    Ceramics International. 05/2013; 39(4):3865–3871.
  • Yang Lv, Ruzhong Zuo
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    ABSTRACT: The effect of the B2O3 addition on the low-temperature sintering, microstructure and microwave dielectric properties of the Ba3(VO4)2–Zn1.87SiO3.87 composite ceramics was investigated. The results indicate that the addition of B2O3 can effectively promote the densification and further improve the microwave dielectric properties of the composite. The low-temperature sintering mechanism was ascribed to the formation of the liquid phase owing to the reaction between the additive B2O3 and the residual SiO2 in the composite. B2O3–SiO2 liquid phases can not only lower the sintering temperature, but also speed up the grain growth of the composite ceramics. The rapid grain growth occurs as the B2O3 content is more than 6 wt%. The 3 wt% B2O3 doped 0.5Ba3(VO4)2–0.5Zn1.87SiO3.87 ceramics can be well sintered at 925 °C and exhibit excellent microwave dielectric properties of Q×f∼40,800 GHz, εr∼10 and τf∼0.5 ppm/°C.
    Ceramics International. 04/2013; 39(3):2545–2550.
  • Jian Fu, Ruzhong Zuo
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    ABSTRACT: Synchrotron x-ray diffraction and absorption fine structure and Raman spectra on (Na,K)(Nb,Sb)O3-LiTaO3 ceramics suggested that the compositionally induced orthorhombic to tetragonal (O-T) ferroelectric phase transition is dominantly driven by A-site Li+ ions with a large [001] off centering, while B-site Nb atoms are only localized near their average positions of the NbO6 octahedra between O and T phases. The Nb-O octahedra distort over the phase transition by adjusting their positions and orientations. The continuous change of lattice constants bo and at across the phase boundary would facilitate the O-T phase transition through a jump of polar axis from pseudocubic [101] to [001].
    Applied Physics Letters 03/2013; 102(12). · 3.52 Impact Factor
  • Shishun Qi, Ruzhong Zuo, Yi Liu, Yu Wang
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    ABSTRACT: Niobium oxide (Nb2O5) nanofibers have been synthesized by sol–gel based electrospinning technique. Pure hexagonal phase (H-Nb2O5) and orthorhombic phase (O-Nb2O5) nanofibers were obtained by thermally annealing the electrospun Nb2O5/polyvinylpyrrolidone composite fibers in air at 500 °C and 700 °C, respectively. The fibers were characterized using the X-ray diffraction, scanning electron microscopy, specific surface area analyzer and UV–vis diffuse reflectance spectroscopy. Photocatalytic activities of the obtained nanofibers were evaluated depending on the degradation of methyl orange. The results indicate that the heat-treatment temperature, the crystalline structure and the morphology affected the physical and chemical properties of the as-prepared Nb2O5 nanofibers. The H-Nb2O5 nanofibers obtained at lower temperature showed better potential for the application as a promising photocatalyst.
    Materials Research Bulletin. 03/2013; 48(3):1213–1217.

Publication Stats

503 Citations
202.05 Total Impact Points

Institutions

  • 2007–2011
    • Hefei University of Technology
      • School of Materials Science and Engineering
      Hefei, Anhui Sheng, China
  • 2000–2009
    • Tsinghua University
      • School of Materials Science and Engineering
      Beijing, Beijing Shi, China
  • 2003–2008
    • Technical University Darmstadt
      • Research Area of Materials Science
      Darmstadt, Hesse, Germany