论文部分内容阅读
用会聚束电子衍射中高阶劳厄带效应产生的holz线测定点阵常数时,通常用(111)带轴图中的holz线。本文探讨在高对称性带轴CBED图中不易观察到holz效应的情况下,用低对称性带铀CBED图中holz线测量点阵常数的可能性。对奥氏体不锈钢和纯铝的不同带轴的CBED图中的holz效应进行了观察。CBED在装有普通SAP极靴的JEOL 100C×H上实现.加速电压120kV。由于奥氏体不锈钢的特征温度较高,原子质量较大,热运动所引起的原子的均方位移较小,Debye—Waller因子较大,(111)带轴的holz线清晰可见,而铝的原子质量较小,Debye—Waller因子较小、(111)带轴的holz线很难观察到。
The holz line in the (111) axis diagram is usually used for the determination of the lattice constant by the holz line generated by the high-order Laue-band effect in the convergent-beam electron diffraction. In this paper, we discuss the possibility of measuring the lattice constant with the holz line in the low-symmetry uranium-containing CBED graph under the condition that the holz effect is not easily observed in the CBED with high symmetry axis. The holz effect in CBEDs of different ribbons of austenitic stainless steel and pure aluminum was observed. CBED is implemented on a JEOL 100C × H equipped with normal SAP pole pieces at an accelerating voltage of 120 kV. Due to the high characteristic temperature of austenitic stainless steel, the atomic mass is larger, the mean square displacement due to thermal motion is smaller, the Debye-Waller factor is larger, the holz line of the (111) axis is clearly visible, and the aluminum The atomic mass is small, the Debye-Waller factor is small, and the (111) holz line with axis is hard to see.