Mahadevan, Sudha and Giridhar, A and Narasimham, PSL and Singh, AK (1984) Dilametric studies on Ge-Sb-Se classes. Journal of Non-Crystalline Solids, 65. pp. 233-240.
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Abstract
Results of measurements of the thermal expansion coefficient from room temperature up to the softening temperature on several compositions of the Ge-Sb-Se glass system are reported. The a -T data for these glasses have two region A below Tg where a is essentially constant followed by a region B around Tg where a increases with temperature. In the region A the composition dependence is identical for the three families of glasses studied, with the a-composition data showing an angularity at the corresponding stoichiometric composition of each family, while changes in a of about eighty percent are seen for compositions across a family, the change in a over the stoichiometric compositions is about fifteen per cent .An expression of the form a=za,x, where a, and x, are the expansion coefficients and weight fractions respectively of the individual structural units is found to account satisfactorily for the a-composition data of these glasses.In the region B,A increases with temperature .The increase in a is greater and begins at about 30to40 degrees lower than Tg for the SE-RICH GLASSES AS COMPARED TO THE Ge-rich glasses,where the increase is less and begins at Tg
Item Type: | Article |
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Additional Information: | Copyright for this article belongs to Elsevier Science Publishers B.V |
Uncontrolled Keywords: | Dilametric studies;Thermal expansion |
Subjects: | AERONAUTICS > Aeronautics (General) |
Depositing User: | M/S ICAST NAL |
Date Deposited: | 23 May 2008 |
Last Modified: | 09 Oct 2015 06:15 |
URI: | http://nal-ir.nal.res.in/id/eprint/4722 |
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