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Nonequilibrium States of Symmetric Tetraalkylammonium Halides

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 is described from a study of the transition behavior using thermal analysis and hot-stage optical Microscopy. Results are discussed in terms of reversibility, supercooling, sharpness of transitions on thermal cycling, and glass transitions. The transitions of plastic to rigid crystals have the largest supercoolings. Gradual disordering on heating and incomplete ordering on cooling are found for some of the salts and represent interesting examples of order/disorder and glass transitions with reduced cooperativity.

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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