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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Diffusion-related implications for langasite resonator operation
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Diffusion-related implications for langasite resonator operation

机译：扩散相关的对兰加石共振器操作的影响

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摘要

Oxygen and gallium diffusiveness in langasite were experimentally determined by analysis of diffusion profiles of 18O and 71Ga tracers by SIMS analysis as functions of temperature and doping. Strontium-enhanced diffusiveness and activation energies of ∼1.2± 0.2 eV confirm the predominant role of oxygen vacancies in controlling the electrical conductivity of langasite at elevated temperature and oxygen partial pressure. The potential impact of high levels of porosity and the use of an oxygen primary ion beam on the accuracy of some of the data is discussed. The gallium diffusivity, with activation energy of 3.13 eV, was found to be more than two orders of magnitude lower than that of oxygen. Surface exchange measurements enabled estimation of gallium loss at elevated temperatures and oxygen partial pressure; the level is not believed to be of major concern for resonator performance.
机译：通过SIMS分析18O和71Ga示踪剂的扩散曲线作为温度和掺杂的函数，通过实验确定了铜矿中氧和镓的扩散性。锶增强的扩散性和〜1.2±0.2 eV的活化能证实了氧空位在控制高温和氧分压下兰加斯特的电导率中的主要作用。讨论了高孔隙率和使用氧气一次离子束对某些数据准确性的潜在影响。发现具有3.13 eV的活化能的镓扩散率比氧气的扩散率低两个数量级。表面交换测量可以估算出高温和氧气分压下的镓损失；认为该电平不是谐振器性能的主要问题。

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