イオン結晶の成長及變形組織

Abstract

The grown up or deformed metals and alloys have fibre structures in general, but it is very interesting to study that if the same phenomena will take place in the inorganic compounds. In these experiments, NaCl, KCl, KBr, KJ, AgCl, and AgBr which are of the NaCl type, CuCl and CuBr of the ZnS type and TlCl, TlBr and TlJ of the CsCl type, were melted and then cast in another pre-heated crucible in order to form the dendrite. In these samples, AgCl, AgBr, CuCl and CuBr have comparatively long dendrite. According to the X-ray (Cu target) Laue photographs, it has been found that these dentrites has a fibre structure of <112> axis. This agrees with the fact that alkali halides which have been crystallized from these liquid states, have ordinarily the (100) and rarely (110) or (111) planes, and AgCl and AgBr have (111) planes. As for plastic deformation, AgCl, AgBr TlCl, TlBr and TlJ can be rolled, and foils of AgCl or AgBr have the fibre strncture whose axis <110> is parallel to the direction of rolling and foils of TlCl, TlBr or TlJ have three fibre axes <100> which intersects with angle 60°to each other. The malleability of these compounds are influenced by the process of the preparation, and AgCl which was produced from AgNO3 and HCl can easily be rolled, though it is very difficult in the case from AgNO3 and KCl. It is supposed from the above fact that the reaction product KNO3 may be remained in the lattice of AgCl and keeps the structure from slipping on the atomic plane. The hardness of AgCl or AgBr increases with the rate of reduction and has a maximum point at 65 ~ 75%. When the foil of AgCl or AgBr is annealed, they have an abnormal hardness at 100℃. The X-ray study shows that these annealed foils have no oriented recrystallization structure, and TlCl, TlBr and TlJ recrystallize at room temperature and also have no oriented structure.