测定晶体热膨胀新技术的实施

IMPLEMENTATION OF THE NEW TECHNIQUE FOR MEASURING THE THERMAL EXPANSION OF CRYSTAL

按照由刘与郑于１９９１年所叙述的以直接测量高角区衍射峰为基础的新技术：α＿（ｍｅａｓｕｒｅ）＝［－ｃｏｔ（２θ＿１／２）」（２θ＿２－２θ＿１）／２（ｔ＿２－ｔ＿１），这里的θ＿１与θ＿２分别为温度ｔ＿１与ｔ＿２时所测得的布拉格角，本文逐项地介绍了新技术的实施步骤与注意事项。

The new technique described by Liu and zheng ( 1991) is based on the direct measurement ofhigh-angle diffraction peads:α_(measure)=[-cot(2θ_1/2)](2θ_2-θ_1))/2(t_2-t_1) , where the Braggangles, θ_1 and θ_2 , are measured at t_1 and t_2 respectively. The implementation steps and conditionsfor implementing the new technique are presented term by term in this paper.