人工晶体学报2012，Vol.41Issue(2)：385-389,5.
LGAS晶体的微结构及声表面波特性研究
Study on the Micro-structure and Surface Acoustic Wave Properties of La3Ga5 -xSiAlxO14 Crystals
摘要
Abstract
The geometry structure, band structure and density of states of La3Ga5-xSiAl,O14 (LGAS) single crystal were investigated by the first principles method. The surface acoustic wave velocity, electromechanical coupling factor and power flow angle were calculated for LGAS single crystal at X, Y, Z cuts, respectively. The 1x1x2 supercell structure of La3Ga5-xSiAlxO14 was constructed for x =0. 5. The supercell shows highest stability with the minimum energy as the 2d tetrahedron site is occupied by Al atom. It is in accordance with the experimental results. Compared with quartz, LGAS crystals are of lower phase velocities and higher electromechanical coupling factor. Doping Al atom decreases the cost of crystal growth. But it has no effect on the structure and surface acoustic wave properties. The propagation direction of 0 of Y-cut LGAS is found to be optimum direction for surface acoustic wave (SAW) device applications.关键词
LGAS晶体/声表面波速度/机电耦合系数/能流角Key words
LGAS crystal/surface acoustic wave velocity/electromechanical coupling factor/power flow angle (PFA)分类
数理科学引用本文复制引用
吴冲,邱贝贝,卢贵武..LGAS晶体的微结构及声表面波特性研究[J].人工晶体学报,2012,41(2):385-389,5.基金项目
国家自然科学基金(11175257) （11175257）
