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Crystallization of As 2 Se 3 ‐As 2 Te 3 Glasses
Author(s) -
LOEHMAN RONALD E.,
ARMSTRONG ALAN J.
Publication year - 1977
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1977.tb16098.x
Subject(s) - crystallization , differential scanning calorimetry , enthalpy , annealing (glass) , endotherm , crystallography , melting point , materials science , analytical chemistry (journal) , chemical composition , chemistry , thermodynamics , physics , metallurgy , chromatography , composite material
Differential scanning calorimetry studies of As 40 Se x Te 60‐x glasses with 0≤x≤60 show a 2‐stage crystallization when 5≤x≤35, followed by a double‐peaked melting endotherm. The enthalpy of crystallization for the low‐temperature species is independent of composition and equals 11.6±0.9 cal/g for x≤25, whereas that for the high‐temperature species decreases from 2.2±0.2 cal/g for x = 5 to 1.1±0.3 cal/g for x =15. The total enthalpy of melting also is independent of composition and equals 18.8±1.2 cal/g for x ≤25. No crystallization was observed for xe40. The high‐temperature phase has the mono‐clinic As 2 Te 3 structure; that of the low‐temperature phase was not identified. Annealing experiments for compositions with x = 15 or 20 gave time‐temperature transformation maps. A kinetic analysis of the data was inconclusive.