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首页> 外文期刊>Physical review >Temperature-dependent elasticity of Pb[(Mg_(0.33)Nb_(0.67))i_(1-x)Ti_x]O_3
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Temperature-dependent elasticity of Pb[(Mg_(0.33)Nb_(0.67))i_(1-x)Ti_x]O_3

机译：Pb [（Mg_（0.33）Nb_（0.67））i_（1-x）Ti_x] O_3的温度依赖性弹性

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摘要

Relaxor ferroelectric materials, such as Pb[(Mg_(0.33)Nb_(0.67))i_(1-x)Ti_x]O_3 (PMN-PT) with generic stoichiometry, undergo a ferroelectric-to-paraelectric phase transition as a function of temperature. The exact transition characterized by Curie temperature (T_c) varies as a function of chemistry (x), i.e., the concentration of Ti. In this study, we investigated the structural phase transition by exploring the temperature dependence of the single-crystal elastic properties of Pb[(Mg_(0.33)Nb_(0.67))i_(1-x)Ti_x]O_3, i.e., x ≈ 0.3. We used resonant ultrasound spectroscopy to determine the elasticity at elevated temperatures, from which T_c = 398 ± 5 K for PMN-PT (x ≈ 0.3) was determined. We report the full elastic constant tensor (C_(ij) = {C_(11), C_(12), C_(44)}), acoustic attenuation (Q~(-1)), longitudinal (V_P) and shear (V_s) sound velocities, and elastic anisotropy of PMN-PT as a function of temperature for 400 < T < 871 K. Temperature trends of the elastic constants C_(11), C_(44) and bulk modulus indicate that at T > T_c the material first stiffens and reaches maxima in the vicinity of the Burns temperature (T_b ~ 673 K), followed by a more typical gradual softening of the elastic constants. Similar temperature-dependent anomalies are also observed with anisotropy and Q~(-1) with minima in the vicinity of T_b. We used the temperature dependence of C_(ij), Q~(-1), V_p, V_s, and anisotropy to infer the evolution of polar nanoregions as the material evolved from T > T_c.
机译：弛豫铁电材料，例如具有一般化学计量比的Pb [（Mg_（0.33）Nb_（0.67））i_（1-x）Ti_x] O_3（PMN-PT），会随温度发生铁电-顺电相变。以居里温度（T_c）为特征的精确转变随化学性质（x）（即Ti的浓度）的变化而变化。在这项研究中，我们通过探索Pb [（Mg_（0.33）Nb_（0.67））i_（1-x）Ti_x] O_3的单晶弹性特性的温度依赖性来研究结构相变，即x≈0.3 。我们使用共振超声光谱法确定了高温下的弹性，由此确定了PMN-PT（x≈0.3）的T_c = 398±5K。我们报告了全弹性常数张量（C_（ij）= {C_（11），C_（12），C_（44）}），声衰减（Q〜（-1）），纵向（V_P）和切变（V_s ）的声速和PMN-PT在400 T_c时首先变硬并在烧伤温度（T_b〜673 K）附近达到最大值，然后是弹性常数的更典型的逐渐软化。在T_b附近，各向异性和Q〜（-1）的最小值也有相似的温度相关异常。我们使用C_（ij），Q〜（-1），V_p，V_s和各向异性的温度依赖性推断材料从T> T_c演化时极性纳米区域的演化。

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  • 来源
    《Physical review》 |2017年第13期|134108.1-134108.9|共9页
  • 作者

    Sumudu Tennakoon; Joseph Gladden; Mainak Mookherjee; Tiglet Besara; Theo Siegrist;

  • 作者单位

    Earth Materials Laboratory, Department of Earth, Ocean and Atmospheric Sciences, Florida State University,Tallahassee, Florida 32306, USA;

    Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA,National Center for Physical Acoustics, University of Mississippi, University, Mississippi 38677, USA;

    Earth Materials Laboratory, Department of Earth, Ocean and Atmospheric Sciences, Florida State University,Tallahassee, Florida 32306, USA;

    National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA;

    National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA,FAMU-FSU College of Engineering, Tallahassee, Florida 32310, USA;

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