Dingquan Xiao

Sichuan University, Hua-yang, Sichuan, China

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Publications (321)697.71 Total impact

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    ABSTRACT: (1−x)K0.48Na0.52Nb0.95Sb0.05O3-x(Bi0.5Na0.5)0.9(Li0.5Ce0.5)0.1ZrO3 [(1−x)KNNS-xBNLCZ] lead-free piezoceramics were prepared by the conventional solid state sintering method. The effects of BNLCZ contents on their phase structure, microstructure, and piezoelectricproperties were investigated. All the samples show a pure perovskite structure, and no secondary phases were formed in the detected range. The rhombohedral and tetragonal phases of (1−x)KNNS-xBNLCZ coexist in the composition range of 0.0325 ≤ x ≤ 0.0425 at room temperature. A remarkably strong piezoelectricity was obtained by the addition of appropriate BNLCZ contents. The excellent piezoelectricproperties of the ceramics with x = 0.04 were obtained: d33 ∼ 485 pC/N, kp ∼ 48%, and TC ∼ 227 °C. All the results show that the introduction of (Bi0.5Na0.5)0.9(Li0.5Ce0.5)0.1ZrO3 is a very effective way to form the rhombohedral and tetragonal phase coexistence of potassium-sodium niobate-based ceramics, which can improve its piezoelectricproperties.
    No preview · Article · Jan 2016 · Journal of Applied Physics
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    ABSTRACT: (1 − x)K0.48Na0.52Nb0.95Sb0.05O3–xBi0.5Na0.5Zr0.95Ce0.05O3 [(1 − x)KNNS–xBNZC] lead-free piezoelectric ceramics, with doping ratio of x ranging from 0 to 0.05, were synthesized by the conventional solid state sintering method. The phase transition behavior, microstructure and piezoelectric properties of (1 − x)KNNS–xBNZC ceramics were systematically investigated using XRD, SEM, and other devices with different doping amounts of BNZC. It was found that the piezoelectric properties of (1 − x)KNNS–xBNZC ceramics were improved obviously by adding the proper doping amount, 0.03 < x < 0.04, due to the coexistence of rhombohedral and tetragonal phases in the ceramics near room temperature. The piezoelectric constant d33 of the ceramics first increased and then decreased when increasing the doping amount. A remarkably strong piezoelectricity was obtained in ceramics with a ∼441 pC N−1 peak d33 value. The excellent piezoelectric properties of (1 − x)KNNS–xBNZC ceramics with x = 0.034 were obtained: d33 = 441 pC N−1, kp = 0.44, Qm = 31, εr = 2447, tanδ = 0.037, TC = 215 °C, Pr = 15.7 μC cm−2 and EC = 8.2 kV cm−1. With the annealing temperature reaching 250 °C, the d33 values of the ceramics were still greater than 330 pC N−1, which represents good temperature stability for the piezoelectric property. It is believed that such a material system is a very promising candidate for lead-free piezoelectric ceramics.
    No preview · Article · Jan 2016 · RSC Advances
  • Zhenwei Li · Jiagang Wu · Dingquan Xiao · Jianguo Zhu · Wenjuan Wu
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    ABSTRACT: Colossal permittivity (CP) materials continue to attract significant interest for their applications in high-performance capacitors and scaling advances in electronic devices. However, the unbalanced developments of their dielectric constants, dielectric losses, and stabilities still hinder practical applications. In this study, we attained a colossal permittivity (εr = 104∼105, 1 kHz) in a series of new titanium dioxide (i.e., (A0.5Ta0.5)xTi1-xO2, where A = Al, Sm, Bi, Fe, In, Dy, Ga, Gd, Yb, or Sc) ceramics containing Ta and trivalent elements that is comparable or superior to the previously reported results in In and Nb co-doped ceramics. In addition, a low dielectric loss (tan δ∼5.4%, 1 kHz) was achieved in the ceramics by tailoring the types of trivalent elements used; such a ceramic also shows relatively good dielectric properties with regard to frequency (102∼106 Hz) and temperature (-150-200 °C) stabilities. The formation of defect-dipole clusters (e.g., Al3+VO••Ti3+ and Ta5+Ti3+ATi (A = Ti3+/Al3+/Ti4+)) induced by Ta and trivalent elements should be responsible for the observed enhancements in dielectric properties. We believe that TiO2-based ceramics are one of the most promising candidates in the field of electronic and energy-storage devices.
    No preview · Article · Jan 2016 · Acta Materialia
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    ABSTRACT: Very recently, we invented a series of new lead-free piezoelectric ceramics (1-x)(K,Na)NbO3-x(Bi0.5Na0.5)(Zr,Ti)O3. The microstructure and electrical properties of the KNN ceramics with different BNZT content were studied in detail. (1-x)(K0.46Na0.54)NbO3-x(Bi0.5Na0.5)(Zr0.85Ti0.15)O3 (x = 0, 0.02, 0.04, and 0.06) [(1-x)KNN-xBNZT] were synthesized by conventional solid sintering method. It was found that the orthorhombic-tetragonal (O−T) phase boundary appears in the (1-x)KNN-xBNZT ceramics with x = 0.04, and the ceramics with x = 0.04 show very good electric properties: d33 = 277 pC/N, kp = 34%, Tc = 340 °C, Pr∼20.4 μC/cm2, and Ec∼13.7 kV/cm.
    No preview · Article · Nov 2015 · Ferroelectrics
  • Tao Huang · Dingquan Xiao · Jiagang Wu · Bo Wu · And Jianguo Zhu
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    ABSTRACT: (0.977-x)(K0.5Na0.5)NbO3-0.023Bi0.5(Na0.9K0.1)0.5TiO3-xSrZrO3 (KNN-BNKT-xSZ) ceramics were prepared by solid-state reaction conventional technique, and the effects of the substitution of SZ on the phase structure and piezoelectric properties of the ceramics were investigated. No secondary phase was identified by X-ray diffrcation analysis, indicating that SZ has completely diffused into the lattice and formed the solid solutions. With the increase of x, the orthorhombic-tetragonal phase transition temperature of the ceramics shifted slightly toward lower temperature. The piezoelectric properties were improved by adding a small amount of SZ, and the optimum piezoelectric performances of d33 = 315 pC/N and kp = 43% were obtained at x = 0.05.
    No preview · Article · Nov 2015 · Ferroelectrics
  • Bo Wu · Dingquan Xiao · Jiagang Wu · Qian Gou · Dandan Mazhao · Jianguo Zhu
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    ABSTRACT: In order to investigate the effect of sintering parameters on the microstructure and electrical properties of (Ba0.98Ca0.02)(Ti0.94Sn0.06)O3 (BCTS) lead-free piezoelectric ceramics, different sets of the sintering parameters were tested, and the effects of sintering parameters on the microstructure and the electrical properties of BCTS ceramics were investigated. An optimum electrical behavior (d33412 pC/N, kp49%) was demonstrated in such a BCTS ceramic sintered at 1450°C for a dwell time of 3 h. As a result, it is an effective way to optimize the electrical properties of BCTS ceramics by choosing an optimum sintering parameter.
    No preview · Article · Nov 2015 · Ferroelectrics
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    ABSTRACT: (Li, Ce) and Mn modified CaBi4Ti4O15 (CBT) based ceramics were prepared by the solid state route, and were substituted by the equimolar ions of Nb5+, Ta5+ and W6+ in the B-site. The variations of crystalline structure, microstructure, piezoelectric properties and dielectric properties were investigated. The XRD patterns indicated that all compositions formed a single bismuth layered-structural phase with m = 4. The additions of Nb2O5, Ta2O5 and WO3 into CBT-based ceramics were found to affect the electrical properties and temperature stability of the ceramics. Compared with Ta2O5 and WO3, the Nb-substitued ceramics exhibited the optimum piezoelectric property and dielectric property (d 33 ~ 19.6 pC/N, ε r ~ 123.7 and tanδ ~ 0.1 %) among all of these samples, together with a high Curie-temperature (T C ~ 767.6 °C). Thermally activated depolarization behavior also demonstrated that the Nb5+ doped CBT-based ceramics possess outstanding thermal stability of piezoelectric properties. These results indicated that Nb2O5 has a substantial effect on the structure and properties of CBT-based ceramics compared to Ta2O5 and WO3.
    No preview · Article · Oct 2015 · Journal of Materials Science Materials in Electronics
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    ABSTRACT: The piezoelectricity of (K,Na)NbO3 ceramics strongly depends on the phase boundary types as well as the doped compositions. Here we systematically studied the relationships between the compositions and phase boundaries types in (K,Na)(Nb,Sb)O3-Bi0.5Na0.5AO3 (KNNS-BNA, A= Hf, Zr, Ti, Sn) ceramics, and then their piezoelectricity can be readily modified. Their phase boundaries types are determined by the doped elements. A rhombohedral-tetragonal (R-T) phase boundary can be driven in the compositions range of 0.035≤BNH≤0.040 and 0.035≤BNZ≤0.045, an orthorhombic-tetragonal (O-T) phase boundary is formed in the composition range of 0.005≤BNT≤0.02, and a pure O phase can be only observed regardless of BNS content (≤0.01). In addition, the phase boundaries types strongly affect their corresponding piezoelectricity. A larger d33 (~440-450 pC/N) and a higher d33* (~742-834 pm/V) can be attained in KNNS-BNA (A=Zr and Hf) ceramics due to the involvement of R-T phase boundary, and unfortunately KNNS-BNA (A=Sn and Ti) ceramics possess a relatively poor piezoelectricity (d33≤200 and d33*<600 pm/V) due to the involvement of other phase structures (O-T or O). In addition, the underlying physical mechanisms for the relationships between piezoelectricity and phase boundaries types were also discussed. We believe that the comprehensive researches can design more excellent ceramic system concerning potassium-sodium niobate.
    Full-text · Article · Aug 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: 0.97(K0.48Na0.52)(Mo2/3Bi1/3)xNb0.97−xSb0.03O3–0.03Bi0.5Na0.5ZrO3 lead-free piezoceramics were prepared by a conventional solid-state reaction route, and the effects of (Mo2/3Bi1/3)5+ on their phase structures, microstructures, and piezoelectric properties were studied. All the samples possess a pure perovskite structure. The coexistence of rhombohedral-orthorhombic-tetragonal phases was observed in all the ceramics. With the increase of x, their TO–T gradually decreases and diffuses and their TR–O slightly increases, while their TC almost keeps unchanged. The ceramics with x=0.004 show the enhanced piezoelectric properties (d33 ~389 pC/N, kp ~0.43, and TC ~285 °C). We believe that the addition of (Mo2/3Bi1/3)5+ is an effective way to enhance the piezoelectric properties of KNN-based ceramics.
    No preview · Article · Aug 2015 · Ceramics International
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    ABSTRACT: The growing environment concerns are pushing the development of lead-free piezoceramics with both outstanding piezoelectric properties and reasonable thermal stability. Herein, we have realized a large piezoelectric coefficient d33 of 430 pC N-1 in 0.96(K0.4Na0.6)(Nb0.96Sb0.04)O3-0.04Bi0.5K0.5Zr0.85Sn0.15O3 (KNNS-BKZS) polycrystals by constructing a rhombohedral-tetragonal (R-T) phase boundary. Investigations of in situ thermal stability of piezoelectric properties at multiple scales reveal that the micro-scale piezoelectric response is much more stable compared to macro-scale, indicating the significant role of extrinsic contributions from domain wall movements. These findings demonstrate the relationship between multi-scale properties and domain structures, reveal that the high piezoelectricity is attributed to nano-domains at R-T phase boundary.
    Full-text · Article · Jul 2015
  • Dandan Mazhao · Dingquan Xiao · Jiagang Wu · Jianguo Zhu
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    ABSTRACT: Lead-free 0.965(K0.45Na0.55)0.95Ag0.05(Nb1−x Sb x )O3–0.035Bi0.5(Na0.5Li0.5)0.5ZrO3 (KNANS x –BNLZ) ceramics were synthesized using the conventional solid-state reaction method, and the effects of Sb5+ content on the phase structure and electrical properties of the samples were investigated. The results showed that the samples endure a phase transition from orthorhombic–tetragonal to rhombohedral–tetragonal (R–T) phases with increasing Sb content. The R–T phase boundary was observed in the composition range of 0.03 ≤ x ≤ 0.05, and then the enhanced electrical properties of d 33 = 345 pC/N and k p = 38.5 % were obtained in the ceramics with x = 0.04, which is mainly ascribed to the involved R–T phase boundary together with a dense microstructure.
    No preview · Article · Jul 2015 · Journal of Materials Science Materials in Electronics
  • Xuedong Li · Hong Liu · Jiagang Wu · Dingquan Xiao · Jianguo Zhu
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    ABSTRACT: 0.9Pb(Sc0.5Ta0.5)O3-0.1PbTiO3 (PSTT10) thin films were deposited on Si(1 0 0) substrate with a LaNiO3 buffer layer by RF magnetron sputtering technique and post annealed by a two-steps rapid thermal annealing method. Dielectric, ferroelectric behaviors and surface morphology of the films were analyzed. The films show good ferroelectric and dielectric properties which is similar to the PSTT5 thin films. The leakage current behavior of the films is according with Ohm law in a low electric field region, while it satisfies a space-charge limited conduction in a medium electric field region. With the increasing of frequency, the dielectric constant decrease and the dielectric loss increase, which shows a typical relaxor behavior. The dielectric constant of the films in low frequency band can be explained as Rayleigh law. The films exhibits crack free and uniform surface, with roughness of about 17 nm.
    No preview · Article · May 2015 · Ferroelectrics
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    ABSTRACT: Traditional solid state reaction method was adopted to synthesize ternary piezoelectric ceramics 0.55Pb(Ni1/3Nb2/3)O3-0.45Pb(Zr0.3Ti0.7)O3 (abbreviated as PNN-PZT) with MnO2 additive (0−3.5% in molar ratio) in order to develop composition ceramics for low dielectric loss multilayer piezoelectric electroacoustic device. Effect of MnO2 doping on electric properties of PNN-PZT ceramics was systematically investigated. The results show that MnO2 doping significantly reduces dielectric loss (tgδ), increases phase transition temperature (Tmax) at a maximum value of relative permittivity, and weakens ferroelectricity. The 1.0 mol% MnO2 doped PNN-PZT ceramics have optimal piezoelectric, dielectric and ferroelectric properties with d33=710 pC/N, kp=0.595, Qm=176, εr=3092 (1 kHz), tgδ=0.0149 (1 kHz), Pr=15.45 μC/cm2, and Ec=4.98 kV/cm. A modified Curie-Weiss law revealed the behavior of diffuse relaxor phase transition of the ceramics. All these results (high d33, high kp, and low tgδ) make the modified PNN-PZT ceramics promising candidates for electromechanical devices. The mechanism of effect of MnO2 doping on electric properties was discussed.
    No preview · Article · May 2015 · Ceramics International
  • Jiagang Wu · Dingquan Xiao · Jianguo Zhu
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    ABSTRACT: Potassium-sodium niobate lead-free piezoceramics have received considerable attention for replacing lead-based ones in some practical applications. This review covers the fundamental aspects of potassium-sodium niobate lead-free piezoelectrics in terms of the relationships between new phase boundaries and high piezoelectric activity. The enhancement in its piezoelectric response is primarily concerned for piezoelectric devices. For a potassium-sodium niobate material, the phase boundaries modifications are important to achieve a high piezoelectric activity. In addition, the compositions concerning phase boundaries have a significant impact on the intensities of piezoelectric properties. Correct evaluation of piezoelectric properties is becoming more important in enabling an accurate comparison of a number of studies based on different systems. In the latter part, our recent advances in its piezoelectric properties are presented with a focus on potassium-sodium niobate to give an overview of the various problems and solutions.
    No preview · Article · Apr 2015 · Journal of Materials Science Materials in Electronics
  • Yinjuan Ren · Xiaohong Zhu · Jiliang Zhu · Jianguo Zhu · Dingquan Xiao
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    ABSTRACT: BiFeO3 (BFO) thin films doped differently with 5 mol% Mn3+ and 5 mol% Mn2+ were prepared on (111)Pt/Ti/SiO2/Si substrates by a sol-gel method with rapid thermal annealing. Systematic analyses about the two different doping effects and their underlying mechanisms were performed. Pure and doped BFO films were well crystallized in perovskite structure, whilst doping of Mn3+ and Mn2+ resulted in slight distortion in the lattice structure. After doping, smaller grain size, diminished structural defects and denser microstructure were confirmed. Both Mn3+ and Mn2+ dopants could reduce the concentration of oxygen vacancies in BFO films, whereas Mn3+doping exhibited better ability. As a result, the Mn3+ doped film showed the highest dielectric permittivity among those three samples, εr=105 at 100 kHz; meanwhile, the Mn3+ doped film showed a superior 2Pr value of 79.5 µC/cm2, compared to 63.2 µC/cm2 for the Mn2+ doped film and unachievable intrinsic ferroelectric polarizations in the undoped BFO film because of high leakage contribution. The leakage current density in medium/high electric field region was dramatically decreased by Mn doping, accompanied with a change of conduction mechanism from the space charge limited conduction to the Schottky mechanism.
    No preview · Article · Apr 2015 · Ceramics International
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    ABSTRACT: Ca0.92(Li,Ce)0.04Bi2Nb2−x Wx O9 (x = 0.01–0.06) high-temperature piezoceramics were prepared by a conventional solid-state sintered method, and effects of W content on their piezoelectric properties were studied. All samples possess a pure Aurivillius-type structure, showing that Li, Ce, and W dopants have well diffused into the CaBi2Nb2O9 lattice to form a solid solution. The doping with W slightly decreases the Curie temperature (T C) of the ceramics. In addition, the excellent electrical properties (e.g., d 33 ~ 16.1 pC/N, k p ~ 9.58 %, Q m ~ 4,767) and a high Curie temperature (e.g., T c ~ 925 °C) are simultaneously obtained in the ceramics with x = 0.04, together with an enhanced thermal stability of <900 °C. As a result, the investigated material system provides the promising potential applications in ultra-high-temperature environments.
    No preview · Article · Apr 2015 · Applied Physics A
  • Bo Wu · Dingquan Xiao · Jiagang Wu · Qian Gou · Jianguo Zhu
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    ABSTRACT: Lead-free piezoelectric ceramics of (Ba0.98Ca0.02)(Ti0.94Sn0.06)O3–x wt% ZnO (BCTS–xZnO) were synthesized by the conventional solid-state method. The microstructures and the electrical properties of BCTS–xZnO ceramics were systematically studied in the composition range of 0 ≤ x ≤ 0.20. It was found that the sintering temperature of BCTS ceramics was gradually decrease using ZnO as a sintering aid, and the addition of ZnO did not change the tetragonal phase structure of the ceramics. The BCTS–xZnO ceramics with x = 0.10 sintered at a lower temperature of ~1,350 °C for 3 h demonstrated an optimum electrical behavior: d 33 ~ 428 pC/N, k p ~ 53.3 %, 2P r ~ 24 μC/cm2, and 2E c ~ 3.0 kV/mm. As a result, the BCTS–xZnO ceramic is a promising candidate for lead-free piezoelectric ceramics.
    No preview · Article · Apr 2015 · Journal of Materials Science Materials in Electronics
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    ABSTRACT: Lead free piezoelectric ceramics (Na0.5K0.5)NbO3 modified by 4% mol. K4CuNb8O23 (abbreviated NKN:4KCN hereinafter) contain moderate piezoelectric constant d 33 ∼ 100 pC N−1 and large mechanical quality factor Q m > 1000, showing possible replacement of the lead-based ones (Chen et al., J Appl. Phys. 102, 104109 (2007)). In terms of practical use, however, the temperature stability of NKN:4KCN is not clear to date. We made a systematic investigation on the properties versus temperature of NKN:4KCN to evaluate whether it can be practically used. In the range from room temperature (RT ∼ 25 °C) to 100 °C, the ferroelectricity of poled NKN:4KCN material is nearly temperature independent, remanent polarization P r is about 27.6 ± 1 μC cm−2. When the as-studied NKN:4KCN ceramics were thermal depolarized in temperature range from RT to 450 °C, piezoelectric constant d 33 changed little, retaining about 99 pC N−1, 77 ± 3 pC N−1, from RT to 150 °C, 200 °C to 350 °C, respectively. The poled NKN:4KCN material showed higher orthorhombic to tetragonal phase transition temperature (T O−T ∼ 200 °C) compared to unpoled sample (T O−T ∼ 194 °C). Moreover, this kind of lead free material displayed negative temperature coefficient of frequency (TCF) and positive TCF in orthorhombic and tetragonal phase state, respectively. The TCF was about −360 ppm K−1 in the range from RT to 125 °C, close to some lead-based commercial ones. The significance of this work lies in evaluating whether such a material can be practically used or not. We believe such a material might be the most promising candidate for replacing lead-based ones in some areas in the future.
    No preview · Article · Mar 2015 · Journal of Applied Physics
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    ABSTRACT: Lead-free piezoelectric ceramics have attracted considerable attention owing to their environmental friendliness and good electrical properties. Here the new (1-x)K0.5Na0.5NbO3–x(0.15Bi0.5Na0.5TiO3–0.85Bi0.5Na0.5ZrO3) [(1-x)KNN–x(BNT–BNZ)] ternary lead-free piezoelectric ceramics synthesized by conventional solid sintering method were reported. The microstructure and electrical properties of (1-x)KNN–x(BNT–BNZ) ternary ceramics were systematically investigated, and the ceramics with x=0.06 possess the enhanced piezoelectric properties and a high TC (e.g., d33~318 pC/N, kp~0.43, and TC~326 oC), which are mainly ascribed to the involved R-T phase boundary. It is believed that such a ceramic system is one of the promising candidates in the field of lead-free piezoelectric ceramics.
    No preview · Article · Mar 2015 · RSC Advances
  • Jiagang Wu · Dingquan Xiao · Jianguo Zhu
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    ABSTRACT: High-performance lead-free piezoceramics have become an international research frontier in the fields of high technology and new materials. (K,Na)NbO3 (KNN) has become one of the most extensively investigated piezoelectric systems. Researchers have reviewed the advances o f KNN-based materials from d ifferent viewpoints, greatly accelerating research progress. Rodel and co-researchers reviewed the phase structure and electrical properties of KNN-based materials by analyzing different processing techniques and chemical modifications. Panda reviewed the effects of additives on the electrical properties of KNN-based materials. In 2009, Xiao et al. reviewed the composition design and property modification of KNN- and BNT-based ceramics by considering their recent publications. Enhanced piezoelectric activity was observed in PZT materials with a Zr/Ti ratio of 52:48 owing to the structural changes going from tetragonal to rhombohedral via an intermediary monoclinic phase. Researchers have confirmed that potassium-sodium niobate lead-free piezoceramics will be a promising lead-free materials for actuator applications.
    No preview · Article · Mar 2015 · Chemical Reviews