The Structure of Non-Crystalline Materials. Calorimetric, Diffraction and Microscopic Examination of Evaporated Amorphous Germanium

摘要

Dynamic calorimetric and thermal gravimetric measurements revealed that evaporated, amorphous Ge adsorbed up to 3 weight % H2O when exposed to the atmosphere. Desiccation removed one-half; however, the remainder was removed only by heating to 450C which also recrystallized the material. The heat of crystallization was found as was the entropy of crystallization. Electron microscopic examination revealed about a 100 A void network as found by others with heterogenous crystallization as samples were annealed beginning at about 200C. During the annealing and crystallization, the normally forbidden (222) electron diffraction reflection was frequently observed. (Author)