Temperature Dependence of the Electroacoustical Constants of Li‐Doped ZnO Single Crystals
Temperature Dependence of the Electroacoustical Constants of Li‐Doped ZnO Single Crystals
复制标题
掺锂 ZnO 单晶电声常数的温度依赖性
DOI：
10.1121/1.1972476
复制
发表时间：
1969
影响因子：
2.4
通讯作者：
V. E. Stubblefield
中科院分区：
文献类型：
--
作者：
R. T. Smith;V. E. Stubblefield
结合超声波速度和压电谐振器技术已被用于确定室温电声常数，以及它们的温度导数的水热生长，Li掺杂的ZnO单晶在10°-110 ° C的温度范围内。最初生长的晶体具有约2×104Ω cm的体电阻率，这足够低，使得在零电场条件下有效地进行超声速度测量。测得的超声波速度和相关的弹性模量与贝特曼在25°C下对类似的低电阻率材料的结果非常一致[（J. Appl. Phys. 33，3309-12（1962）]。材料随后在高达800°C的几个温度下热退火以增加电阻率（最终值>1011Ω cm），并重新测量电声常数及其温度导数。从室温数据计算的机电耦合系数ag…
A combination of ultrasonic velocity and piezoelectric resonator techniques has been used to determine the room‐temperature electroacoustical constants and also their temperature derivatives for a hydrothermally grown, Li‐doped single crystal of ZnO in the temperature range 10°–110°C. The crystal as initially grown had a bulk electrical resistivity of about 2×104Ω cm, which was low enough such that the ultrasonic velocity measurements were effectively made under zero electric‐field conditions. The measured ultrasonic velocities and associated elastic moduli were in excellent agreement with Bateman's 25°C results for similar, low‐resistivity material [(J. Appl. Phys. 33, 3309–12 (1962)]. The material was subsequently thermally annealed at several temperatures up to 800°C to increase the electrical resistivity (final value >1011Ω cm), and the electroacoustical constants and their temperature derivatives were remeasured. The electromechanical coupling coefficients calculated from the room‐temperature data ag...