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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Mechanical and thermal transitions in morphotropic PZN-PT and PMN-PT single crystals and their implication for sound projectors
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Mechanical and thermal transitions in morphotropic PZN-PT and PMN-PT single crystals and their implication for sound projectors

机译：同晶PZN-PT和PMN-PT单晶的机械和热转变及其对声音投影仪的影响

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摘要

Isothermal compression experiments on multidomain [001] oriented and poled ferroelectric rhombohedral PZN-0.07PT and PMN-0.30PT single crystals revealed elastic instabilities corresponding to zero field ferroelectric-ferroelectric phase transition under mechanical compression. The application of an appropriate dc bias field doubled the stability range of the ferroelectric rhombohedral state under uniaxial compression for both crystals and maintained a linear elastic response. Young''s modulus as derived from the quasistatic, zero field stress-strain linear response agreed well with that derived from small signal resonance for the ferroelectric rhombohedral FR state of both PZN-PT and PMN-PT. Elastic compliances S33 E as determined from high temperature resonance revealed a monotonically decreasing Young''s modulus as a function of temperature in the ferroelectric rhombohedral state with a sudden stiffening near the ferroelectric rhombohedral (FR)-ferroelectric tetragonal (FT) transition. The reversible ferroelectric-ferroelectric transition of morphotropic PZN-PT and PMN-PT single crystals as accessed by mechanical compression is discussed in terms of strain calculations from Devonshire''s theory, domain unfolding, and morphotropic phase boundary shift with mechanical stress. The mechanically-induced and thermally-induced ferroelectric-ferroelectric transition trajectories are discussed in terms of the Devonshire theory. Implications of these observations for sound projectors are discussed. A single crystal tonpilz projector fabricated into a 16-element array and a segmented cylinder transducer demonstrated the outstanding capabilities of single crystals to achieve compact, broadband, and high-source level projectors when compared to conventional lead zirconate-titanate PZT8 projectors.
机译：在多域[001]取向和极化铁电菱形PZN-0.07PT和PMN-0.30PT单晶上进行的等温压缩实验显示，机械压缩下的弹性不稳定性对应于零场铁电-铁电相变。适当的直流偏置场的应用使两种晶体在单轴压缩下铁电菱形面态的稳定性范围加倍，并保持了线性弹性响应。由准静态零场应力-应变线性响应得出的杨氏模量与由PZN-PT和PMN-PT的铁电菱形FR态的小信号谐振得出的杨氏模量非常吻合。由高温共振确定的弹性柔度S33 E在铁电菱形体状态下单调降低的杨氏模量随温度变化，在铁电菱形体（FR）-铁电四方（FT）跃迁附近突然变硬。根据德文郡理论的应变计算，畴展开和伴随机械应力的变质相边界移动，讨论了通过机械压缩获得的同质PZN-PT和PMN-PT单晶的可逆铁电-铁电跃迁。根据德文郡理论讨论了机械感应和热感应的铁电-铁电跃迁轨迹。讨论了这些观察对投影仪的影响。与传统的锆钛酸铅PZT8投影机相比，由16个元件阵列组成的单晶tonpilz投影机和分段圆柱换能器展示了单晶的出色功能，可实现紧凑，宽带和高光源水平的投影机。

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