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Thermal crystallization behavior of As-Te glasses

Titus, SSK and Asokan, S and Panchapagesan, TS and Gopal, ESR (1992) Thermal crystallization behavior of As-Te glasses. In: Physical Review B, 46 (22). pp. 14493-14500.

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Abstract

Thermal crystallization behavior of $As_xTe_{100-x}$ $(25\leq_x\leq60)$ glasses is studied by differential scanning calorimetry. $As_xTe_{100-x}$ glasses with x<40 are found to exhibit one glass transition and one crystallization reaction, during heating. On the other hand, glasses with $40\leqx\leq50$ show one glass transition and two crystallization reactions. Unlike other binary telluride glasses, the first crystallization reaction in $As_xTe_{100-x}$ glasses does not correspond to the precipitation of hexagonal Te. It corresponds to the formation of a metastable intermediate crystalline phase, which transforms into the equilibrium $As_2Te_3$ phase at the second crystallization reaction. As a consequence of this difference in the crystallization behavior, $As_xTe_{100-x}$ glasses with $40\leqx\leq50$ do not show the phenomenon of double glass transition. Further, the two crystallization reactions of these glasses are found to merge progressively, with the increase in arsenic content. As a result, $As_xTe_{100-x}$ glasses with $50\leqx\leq60$ show only one crystallization reaction. An explanation for this interesting crystallization behavior of $As_xTe_{100-x}$ glasses is provided with the help of x-ray diffraction, electron microscopy, and thermogravimetry studies.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Oct 2006
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ernet.in/id/eprint/8256

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