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Nonequilibrium States of Symmetric TetraalkylammoniumHalides

Published online by Cambridge University Press:  15 February 2011

A. Xenopoulos ,
M. Mucha  and
B. Wunderlich
A. Xenopoulos
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, and Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197.
M. Mucha
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, and Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197.
B. Wunderlich
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, and Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197.
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Abstract

The nonequilibrium behavior of symmetrical tetra-n-alkylammonium halides isdescribed from a study of the transition behavior using thermal analysis andhot-stage optical Microscopy. Results are discussed in terms ofreversibility, supercooling, sharpness of transitions on thermal cycling,and glass transitions. The transitions of plastic to rigidcrystals have the largest supercoolings. Gradual disordering on heating andincomplete ordering on cooling are found for some of the salts and representinteresting examples of order/disorder and glass transitions with reducedcooperativity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 53
Copyright
Copyright © Materials Research Society 1994

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References

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