Creator:H.L. Suchan and H.G. Drickamer
Date Created:March 23, 1959
Place Created:Urbana, Illinois
Keywords:triglycine sulfate,pressure indused phase transitions
Context:article reprinted from the Journal of Chemical Physics
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Reprinted from the Journal of Chemical Pyhsics, Vol. 31, No. 3, 856, September, 1959
Printed in U. S. A.
Two Pressure Induced Phase Transitions in Triglycine Sulfate*
H. L. Suchan and H. G. Drickamer
Department of Chemistry and Chemical Enginering, University of Illinois, Urbana, Illinois
(Received March 23, 1959)
IN investigation was initiated on the effect of pressure on the optical properties of triglycine sulfate. The absorption edge proved to be outside the range of our equipment. In the course of the investigation two-phase changes were encountered at 23 000 and 39 000 atmospheres. Their optical effects were typical of first-order phase changes observed previously1 with a sharp cutting off of the light and an equally sharp restoration of transmission above the transition. Both transitions were completely reversible. By warming the bomb it was established that the transition
pressures were independent of temperature in the range 25°C-60°C.
The authors would like to thank J. H. Nielsen of Bell Laboratories for the crystal of triglycine sulfate. H. L. Suchan would like to acknowledge financial assistance from a Standard Oil Company (Ohio) Fellowship.
1 T. E. Slykhouse and H. G. Drickamer, "Colloquium on high pressure effects," Bellevue, France (1957).
* This work was supported in part by U. S. Atomic Energy Commission Contract AT (11-1)-67, Chemical Engineering Project 5.