Ag-Ge-S 3元系ガラスの構造

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タイトル別名
  • Structure of Ag-Ge-S Ternary Glasses
  • Ag Ge S 3ゲンケイ ガラス ノ コウゾウ

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抄録

As considerable attention has been given to the ternary alloys of Ag-Ge-S in the glassy state because of the highly ionic conduction of silver ions, the atomic structure of these materials has been investigated by X-ray diffraction. Two series of specimens have been examined: One is AgxGe2S3 (x=0∼2.1) alloys in which a given amount silver atoms is dissolved. The other is AgxGe1−xS (x=0.33∼0.7) alloys in which a portion of germanium atoms is replaced by silver atoms. The intensity measurements of X-ray diffraction have been carried out by the step scanning method with MoKα radiation in the range of 5° to 150°. The interference function was derived from the analysis of data and the pair distribution function gE(r) has also been obtained by the Fourier transformation. The following results have been obtained:<BR>(1) In AgxGe2S3, the nearest neighbour distance R1 increases with increasing x. A similar behaviour is seen in GeXS, where X varies from 2.0 to 1.0. In AgxGe1−xS, on the other hand, R1 does not change with x.<BR>(2) In both series of the specimens, the height of first peaks decreases with increasing x, while the peak width increases.<BR>(3) In AgxGe2S3, the coordination number obtained from the first peak of gE(r) increases with increasing x, but in AgxGe1−xS the coordination number does not change with x.<BR>A theoretical pair distribution function gC(r) has been estimated on the assumption that the atomic position of GeS and GeS2 is spatially fluctuated by a Gaussian probability. The results fairly agree with the experimental ones, which implies that the basic structures of both series resemble to those of GeS and GeS2. Since the peak width of gE(r) increases with the amount of silver atoms, it might be suggested that a part of siler atoms occupies the “interstitial site” and consequently these “interstitial ions” contribute to the highly ionic conduction.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 43 (10), 952-957, 1979

    公益社団法人 日本金属学会

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