摘要
首先利用无约束最优化法,在文献的基础上,计算出了偏硼酸钡(β-BBO)晶体弹性系数测量结果中所缺少的弹性劲度系数cE14和弹性顺服系数sE13、sE14等3个数值,分别为cE14=8.32GN·m-2,sE13=4.40pm2·N-1和sE14=43.0pm2·N-1,并在此基础上,对β-BBO晶体的声传播特性进行了详细的理论研究,得到了3个主晶面内压电修正的声速各向异性曲线,并计算出了不同模式的声波沿3个主轴方向的声速。
According to the knowledge of crystal physics, the elastic constants c^E_(14),s^E_(13) and s^E_(14) of β-barium metaborate(ie.β-BBO) which have not been measured by the published literature are determined by unconstrained optimization method. These are c^E_(14)=8.32 GN·m^(-2),s^E_(13)=4.40 pm^2·N^(-1) and s^E_(14)=43.0 pm^2·N^(-1). Based on the above results, the sound propagating properties of β-BBO crystal have been studied theoretically. And the sound velocities along x, y and z directions are also calculated.
出处
《压电与声光》
CSCD
北大核心
2004年第1期56-58,共3页
Piezoelectrics & Acoustooptics
基金
北京工业大学青年骨干教师基金资助项目(JQ0603200101)
关键词
偏硼酸钡晶体
弹性系数
克里斯托夫方程
声速
β-barium metaborate
elastic constants
christoffel equation
sound velocity
