Cu-As-Se系ガラスの硬さと密度

概要

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Densities and Knoop hardnesses of As-Se and Cu-As-Se glasses were measured and correlated with the glass structure. On the As-Se binary system, the density and hardness were measured as functions of As content. In these curves, minimum points were found near 55-60 at% As, in addition to a well known maximum at 40 at% As. When Cu was added to the As-Se binary system, the minimum point in the As-rich region shifted toward the As-poor side. The compositions corresponding to the minimum, i.e. (55-60As, 40-45Se), (5Cu, 50As, 45Se) and (10Cu, 45-50As, 40-45Se), could be approximately connected by a line in Cu-As-Se diagram. This line divided the glass formation region of the Cu-As-Se system into two different glass structure regions. When Cu was added to As2Se3, both density and hardness increased with increasing Cu content, but the rate of increase changed at 15-20 at% Cu. In the As- and Cu-poor region, it is considered that Cu atoms added to the As-Se binary system fill up vacancies in the As-Se glass structure and increase the density. It is also stated that Cu results in Cu-Se bond, increasing the hardness. In the As- and Cu-rich region, metallic bond such as Cu-Cu is supposed to be formed. The structure having the metallic bond may be correlated to the peculiar phenomena, for instance, voltage controlled switching effect of the glass in this structure region.
社団法人日本セラミックス協会の論文
1974-11-01