The Experts below are selected from a list of 815181 Experts worldwide ranked by ideXlab platform

Dingquan Xiao - One of the best experts on this subject based on the ideXlab platform.

  • Phase Structure and piezoelectric properties of 1 x k0 48na0 52nb0 95sb0 05o3 x bi0 5na0 5 0 9 li0 5ce0 5 0 1zro3 lead free piezoelectric ceramics
    Journal of Applied Physics, 2016
    Co-Authors: Jie Xing, Jiagang Wu, Laiming Jiang, Qiang Chen, Wen Zhang, Dingquan Xiao
    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 piezoelectric properties 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 piezoelectric properties 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 piezoelectric properties.

  • Phase Structure and electrical properties of k0 5na0 5 nbo3 bi0 5na0 5 zro3 lead free ceramics with a sintering aid of zno
    Ceramics International, 2014
    Co-Authors: Fangxu Li, Jiagang Wu, Dingquan Xiao, Zhuo Wang
    Abstract:

    Abstract 0.95(K 0.5 Na 0.5 )NbO 3 –0.05(Bi 0.5 Na 0.5 )ZrO 3 – x ZnO (KNN–BNZ– x ZnO) lead-free piezoceramics were prepared by the conventional solid-state method, and effects of ZnO content on their Phase Structure, microStructure, and electrical properties were studied. The ceramics with x =0.01 possess the mixture of both rhombohedral–orthorhombic and orthorhombic–tetragonal Phase boundaries. Their grain size becomes more homogenous and much smaller with the addition of ZnO. Enhanced dielectric and piezoelectric properties (e.g., d 33 =320 pC/N, k p =0.484, T C =320 °C) were observed in the ceramic with x =0.01. These results show that such a material system belongs to be a promising lead-free piezoelectric material.

  • effects of k na ratio on the Phase Structure and electrical properties of kxna0 96 xli0 04 nb0 91ta0 05sb0 04 o3 lead free ceramics
    Applied Physics Letters, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (KxNa0.96−xLi0.04)(Nb0.91Ta0.05Sb0.04)O3 (x=0.32–0.56) lead-free piezoelectric ceramics were prepared by conventional sintering. The effects of K∕Na ratio on the Phase Structure and electrical properties of the ceramics were studied. These results indicate that the Phase Structure undergoes a transition from orthorhombic to tetragonal Phase with increase of x. The ceramics with x=0.38 exhibit enhanced electrical properties (d33∼306pC∕N; kp∼48%; kt∼49%; Tc∼337°C; ϵr∼1327; tanδ∼2.5%; Pr∼34.9μC∕cm2; Ec∼11.3kV∕cm). Enhanced electrical properties of the ceramics should be attributed to the polymorphic Phase transition near room temperature. These results show that the ceramic with x=0.38 is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Ping Yu, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is ...

Yihang Jiang - One of the best experts on this subject based on the ideXlab platform.

  • effects of k na ratio on the Phase Structure and electrical properties of kxna0 96 xli0 04 nb0 91ta0 05sb0 04 o3 lead free ceramics
    Applied Physics Letters, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (KxNa0.96−xLi0.04)(Nb0.91Ta0.05Sb0.04)O3 (x=0.32–0.56) lead-free piezoelectric ceramics were prepared by conventional sintering. The effects of K∕Na ratio on the Phase Structure and electrical properties of the ceramics were studied. These results indicate that the Phase Structure undergoes a transition from orthorhombic to tetragonal Phase with increase of x. The ceramics with x=0.38 exhibit enhanced electrical properties (d33∼306pC∕N; kp∼48%; kt∼49%; Tc∼337°C; ϵr∼1327; tanδ∼2.5%; Pr∼34.9μC∕cm2; Ec∼11.3kV∕cm). Enhanced electrical properties of the ceramics should be attributed to the polymorphic Phase transition near room temperature. These results show that the ceramic with x=0.38 is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Ping Yu, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is ...

Xianming Liu - One of the best experts on this subject based on the ideXlab platform.

  • Phase Structure of the born infeld anti de sitter black holes probed by non local observables
    arXiv: High Energy Physics - Theory, 2016
    Co-Authors: Xiaoxiong Zeng, Xianming Liu
    Abstract:

    With the non-local observables such as two point correlation function and holographic entanglement entropy, we probe the Phase Structure of the Born-Infeld-anti-de Sitter black holes. We find for the case $bQ>0.5$, the Phase Structure is similar to that of the Reissner-Nordstrom-AdS black hole, namely the black hole undergoes a Hawking-Page Phase transition, a first order Phase transition, and a second order Phase transition. While for the case $bQ<0.5$, we find there is a new branch for the infinitesimally small black hole so that a pseudo Phase transition emerges besides the original first order Phase transition. For the first order Phase transition and the pseudo Phase transition, the equal area law is checked, and for the second order Phase transition, the critical exponent of the analogous heat capacity is obtained in the neighborhood of the critical points. All the results show that the Phase Structure of the non-local observables is the same as that of the thermal entropy regardless of the size of the boundary region in the field theory.

  • Phase Structure of the born infeld anti de sitter black holes probed by non local observables
    European Physical Journal C, 2016
    Co-Authors: Xiaoxiong Zeng, Xianming Liu
    Abstract:

    With the non-local observables such as two point correlation function and holographic entanglement entropy, we probe the Phase Structure of the Born–Infeld–anti-de Sitter black holes. For the case \(bQ>0.5\), where b is the Born–Infeld parameter and Q is the charge of the black hole, the Phase Structure is found to be similar to that of the Van der Waals Phase transition, namely the black hole undergoes a first order Phase transition and a second order Phase transition before it reaches a stable Phase. While for the case \(bQ<0.5\), a new Phase branch emerges besides the Van der Waals Phase transition. For the first order Phase transition, the equal area law is checked, and for the second order Phase transition, the critical exponent of the heat capacity is obtained. All these results are found to be the same as that observed in the entropy–temperature plane.

Jiagang Wu - One of the best experts on this subject based on the ideXlab platform.

  • Phase Structure and piezoelectric properties of 1 x k0 48na0 52nb0 95sb0 05o3 x bi0 5na0 5 0 9 li0 5ce0 5 0 1zro3 lead free piezoelectric ceramics
    Journal of Applied Physics, 2016
    Co-Authors: Jie Xing, Jiagang Wu, Laiming Jiang, Qiang Chen, Wen Zhang, Dingquan Xiao
    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 piezoelectric properties 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 piezoelectric properties 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 piezoelectric properties.

  • Phase Structure and electrical properties of k0 5na0 5 nbo3 bi0 5na0 5 zro3 lead free ceramics with a sintering aid of zno
    Ceramics International, 2014
    Co-Authors: Fangxu Li, Jiagang Wu, Dingquan Xiao, Zhuo Wang
    Abstract:

    Abstract 0.95(K 0.5 Na 0.5 )NbO 3 –0.05(Bi 0.5 Na 0.5 )ZrO 3 – x ZnO (KNN–BNZ– x ZnO) lead-free piezoceramics were prepared by the conventional solid-state method, and effects of ZnO content on their Phase Structure, microStructure, and electrical properties were studied. The ceramics with x =0.01 possess the mixture of both rhombohedral–orthorhombic and orthorhombic–tetragonal Phase boundaries. Their grain size becomes more homogenous and much smaller with the addition of ZnO. Enhanced dielectric and piezoelectric properties (e.g., d 33 =320 pC/N, k p =0.484, T C =320 °C) were observed in the ceramic with x =0.01. These results show that such a material system belongs to be a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Ping Yu, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is ...

  • effects of ag content on the Phase Structure and piezoelectric properties of k0 44 xna0 52li0 04agx nb0 91ta0 05sb0 04 o3 lead free ceramics
    Applied Physics Letters, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Zhaohui Pu
    Abstract:

    (K0.44−xNa0.52Li0.04Agx)(Nb0.91Ta0.05Sb0.04)O3 lead-free piezoelectric ceramics were prepared by normal sintering. The effects of Ag content on the Phase Structure and piezoelectric properties of the ceramics were mainly studied. These results show that the Phase Structure undergoes a transition from orthorhombic to tetragonal Phase with increasing x from 0.00 to 0.06. The optimum Ag content enhances the piezoelectric properties, and the Curie temperature increases with increasing x. The ceramics with x=0.02 exhibit enhanced electrical properties (d33∼263pC∕N, kp∼45.3%, TC∼353°C, er∼1478, and tanδ∼2.3%) and good aging characteristics. These results show that the ceramic with x=0.02 is a promising lead-free piezoelectric material.

Yuanyu Wang - One of the best experts on this subject based on the ideXlab platform.

  • effects of k na ratio on the Phase Structure and electrical properties of kxna0 96 xli0 04 nb0 91ta0 05sb0 04 o3 lead free ceramics
    Applied Physics Letters, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (KxNa0.96−xLi0.04)(Nb0.91Ta0.05Sb0.04)O3 (x=0.32–0.56) lead-free piezoelectric ceramics were prepared by conventional sintering. The effects of K∕Na ratio on the Phase Structure and electrical properties of the ceramics were studied. These results indicate that the Phase Structure undergoes a transition from orthorhombic to tetragonal Phase with increase of x. The ceramics with x=0.38 exhibit enhanced electrical properties (d33∼306pC∕N; kp∼48%; kt∼49%; Tc∼337°C; ϵr∼1327; tanδ∼2.5%; Pr∼34.9μC∕cm2; Ec∼11.3kV∕cm). Enhanced electrical properties of the ceramics should be attributed to the polymorphic Phase transition near room temperature. These results show that the ceramic with x=0.38 is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Dingquan Xiao, Jianguo Zhu, Yuanyu Wang, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is a promising lead-free piezoelectric material.

  • compositional dependence of Phase Structure and electrical properties in k0 42na0 58 nbo3 lisbo3 lead free ceramics
    Journal of Applied Physics, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Ping Yu, Yihang Jiang
    Abstract:

    (1−x)(K0.42Na0.58)NbO3-xLiSbO3 [(1−x)KNN-xLS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the Phase Structure and the electrical properties of the ceramics were studied. A morphotropic Phase boundary (MPB) between the orthorhombic and tetragonal Phases was identified in the composition range of 0.04piezoelectric properties. The ceramics with 5 mol. % LS exhibit enhanced electrical properties (d33∼270 pC/N, kp∼47.2%, Tc∼364 °C , To-t=35 °C, er∼1412, tan δ∼2.8%, and Pr∼25.7 μC/cm2; Ec∼11.1 kV/cm) and possess low dielectric loss (<2%) at 10 and 100 kHz at high temperature (250–400 °C). The low dielectric loss at high temperature is very important for high-temperature application of the ceramics. The related mechanism of the enhanced electrical properties of the ceramics was also discussed. These results show that (1−x)KNN-xLS (x=0.05) ceramic is ...

  • effects of ag content on the Phase Structure and piezoelectric properties of k0 44 xna0 52li0 04agx nb0 91ta0 05sb0 04 o3 lead free ceramics
    Applied Physics Letters, 2007
    Co-Authors: Jiagang Wu, Dingquan Xiao, Yuanyu Wang, Zhaohui Pu
    Abstract:

    (K0.44−xNa0.52Li0.04Agx)(Nb0.91Ta0.05Sb0.04)O3 lead-free piezoelectric ceramics were prepared by normal sintering. The effects of Ag content on the Phase Structure and piezoelectric properties of the ceramics were mainly studied. These results show that the Phase Structure undergoes a transition from orthorhombic to tetragonal Phase with increasing x from 0.00 to 0.06. The optimum Ag content enhances the piezoelectric properties, and the Curie temperature increases with increasing x. The ceramics with x=0.02 exhibit enhanced electrical properties (d33∼263pC∕N, kp∼45.3%, TC∼353°C, er∼1478, and tanδ∼2.3%) and good aging characteristics. These results show that the ceramic with x=0.02 is a promising lead-free piezoelectric material.