Diffusion-related implications for langasite resonator operation |
| |
Authors: | Schulz Michal Fritze Holger Tuller Harry L Seh Huankiat |
| |
Affiliation: | Department of Physics, Metallurgy and Materials Science, Technische Universit?t Clausthal, Clausthal-Zellerfeld, D-38678 Germany. michal.schulz@tu-clausthal.de |
| |
Abstract: | Oxygen and gallium diffusivities 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 diffusivities and activation energies of approximately 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|