测定立方晶体线性热膨胀新技术的进一步证验

FURTHER CONFIRMATION OF THE NEW TECHNIQUE FOR MEASURING THE LINEAR THERMAL EXPANSION OF CUBIC CRYSTAL

本文进一步证验了：就快速而准确测定立方晶体的线性热膨胀来说，用Ｘ射线衍射仪直接测量不同温度的衍射角比测量不同温度的点阵参数更好，用新技术测飞利浦ＰＷ＿（１５３０ＱＳ）型ＬｉＦ与广州产的高纯ＬｉＦ单晶在室温下的线性热膨胀系数分别为α＿（ＰＷ）＝（３．３７±０．０２）×１０￣（－５）／℃与α＿（ＧＺ）＝（３．３３±０．

This paper further confirms that the direct measurement of diffraction angles at differenttemperature by using the X-ray diffractometer is better than measurement of the latticeparameters for the rapid and accurate determination of the linear thermal expansion of cubiccrystal. The linear coefficient of thermal expansion for Philip’s PW_(1530QS)-type LiF and highpurity LiF made in Guangzhou have been measured at room temperature by using the newtechnique. They are α_PW=(3.37±0.02)×10￣(-5)/℃ and α_(Guangzhou) =(3.33 ±0.03)×10￣(_5)/℃。