Copper as an additive in the As 0.4 Se 0.3Teo.3 glass: Mean atomic volume and Tg

Mahadevan, Sudha and Giridhar, A (1997) Copper as an additive in the As 0.4 Se 0.3Teo.3 glass: Mean atomic volume and Tg. Journal of Non-Crystalline Solids, 221 (2-3). pp. 281-289.

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    Abstract

    Data on the mean atomic volume(V) and the glass transition temperature (Tg ) of the As,,4 Se o 3Teo 3 glass, modified with Cu are reported and discussed. The V and Tg of the parent glass are invariant with addition of 5 1 atomic percent (at.%) of Cu up to which clusters of Cu atoms occupy interlayer positions in the layered network of the parent glass. For additions of Cu gt; 1 at.%, a decrease in V and an increase in TxA3; are observed. The composition dependencies of V and T are consistent with a model according to which, with progressive increase in the Cu content, some of the original As 2 Se 3 and As 2Te313; structural units of the parent glass are replaced, respectively, by CuAsSe 2 and CuAsTe structural units. For Cu gt; 23.08 at.%, after the formation of CuAsSe, structural units, there is no free Se available for the formation of As 2 Se 3 structural units; as no free Se is available, a change of slope occurs in the V-composition and Tg -composition data at the Cu content of 23.08 at.%. The increase in Tg with increasing Cu content is due to an increase in the average coordination number brought about13; by an increase in cross linking due to the formation of tetrahedral CuAsSe, and CuAsTe complexes in the glasses.

    Item Type: Journal Article
    Additional Information: copyright belongs to Elsevier
    Uncontrolled Keywords: Copper;Mean automic volume;13; Glass transition temperature;Layered network
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: Mr. N A
    Date Deposited: 16 May 2006
    Last Modified: 03 May 2012 11:41
    URI: http://nal-ir.nal.res.in/id/eprint/1446

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