As-S 系ガラスの物性(硫化物ガラスの物性と構造 II)

概要

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Glass samples containing various compositions in fairly wide range were prepared by melting raw materials consisting of elementary As and S in definite proportions in sealed vacuum tube.The method of chemical analysis of these glasses was examined (Table 3). As was determined by the modified Volhard method, the iodometric method and the gravimetric method. In the last case, As was oxidised to As2O5 by use of fuming HNO3. S was determined by the gravimetric method as BaSO4, after S was converted to SO4 ion.Molecular volume, molecular refraction (Table 4 and Fig. 1), hardness (Fig. 2) and viscosity (Fig. 3, 4) of these glasses were investigated and, additionally, solubility ofthese glasses to CS2 was measured (Fig. 5, 6). It has been recognized that S of ring form type dissolves easily to CS2, but the case is not in S of chain like type.The results obtained are as follows.(1) No As=S bond seems to exist in these glasses.(2) The As-As bond must exist in the glasses which have lower content of sulfur than that of As2S3.(3) with increasing S content over As2S3, S is likely to exist as chain like form type but in such range that the content of S is over that of As2S8-10, some parts of S are ring form type, partially coexisting S of chain like form.
社団法人日本セラミックス協会の論文
1968-04-01