摘要
采用纳米压痕法测量了新型无机闪烁体材料LaCl3和LaBr3单晶的弹性模量,以及用波形信号发生器产生的超声波在两种晶体中沿c轴和垂直c轴方向的传播速度,并结合声速,通过Christoffel方程计算得到了两种晶体的弹性常数矩阵,利用第一原理计算了两种晶体沿c轴方向的弹性模量值。结果表明:在LaBr3晶体中声波的传播速度大于LaCl3的;纳米压痕法实验测得LaCl3和LaBr3单晶沿c轴方向的弹性模量值分别约为45.3GPa和32.5GPa,接近真实情况。
The modulus of elasticity of new inorganic scintillation materials, LaCl3 and LaBr3 single crystals, were measured by the nano-indentation method. The propagation velocities of ultrasonic wave parallel and perpendicular to c-axis direction in these two crystals were obtained via a weveform signal generator, and their elastic constant matrixes were calculated through the velocity and Christoffel equation. The first-principle was also used to calculate the modulus of elasticity parallel to c-axis direction in crystals. The results show that the propagation velocity of ultrasonic wave in LaBr3 single crystal is greater than that in LaCl3 single crystal. The modulus of elasticity of LaCl3 and LaBr3 single crystals parallel to c-axis are approximately 45 and 33 GPa determined through nano-indentation method, which are close to the true state.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第5期878-884,共7页
Journal of The Chinese Ceramic Society
关键词
弹性模量
弹性常数矩阵
氯化镧晶体
溴化镧晶体
超声
纳米压痕
modulus of elasticity
elastic constant matrix
lanthanum chloridize crystal
lanthanum bromize crystal
ultrasound
nano-indentation
