Crstallographic Study on Optical Memory Alloys using Phase Transformation

本研究的目的是了解晶体学发生的光存储性能的合金。提出了在合金中显示光学特性的几种方法：（i）在高温和低温下必须使用两个稳定相，并且必须使用另一个不稳定相;（ii）必须使用点缺陷，如热空位;（iii）必须使用塑性引入的点缺陷。Zn-Ag合金的制备工艺及光存储性能采用蒸发技术制备了Zn-Ag合金薄膜。用X射线衍射和光谱分析方法研究了沉积态和热处理态薄膜的晶体结构和光学性质，并进行了关联。结果表明，光学性能对合金成分和热处理工艺敏感。B_2型金属间化合物的光学性质测量了NiAl和CoAl两种B_2型金属间化合物的光学性质。在这两种合金中，这种性质被证明是敏感的合金成分和热处理。

The Present study aimed to understand crystallographically the occurrence of the optical memory property of the alloys.1. Consideration on crystallographic prerequests showing optical memory propertySome methods by which an optical property is shown in the alloys are proposed; (i) two stable phases at high and low temperatures, and an additional unstable phase must be used, (ii) point defects like thermal vacancies must be used, and (ill) plastically introduced point defects must be used.2. Processing and optical memory property in Zn-Ag alloyThin foils of Zn-Ag alloy were prepared by evaporation technique. Crystal structure and optical property of as-deposed and heat-treated thin foils were examine by X-ray diffraction and optical spectroscopy and then correlated. It was shown that optical property was to sensitive alloy composition and heat-treatment.3. Optical property of B2-type Intermetallic compoundsOptical property for two alloys of NiAl and CoAl with B2 structure was measured. In both alloys, this property was shown to be sensitive to alloy composition and heat-treatment.