Temperature and Pressure Dependence of the Elastic Constants of Ammonium Bromide

Publisher Website
Google Scholar
Abstract
The adiabatic elastic constants of single-crystal ammonium bromide have been measured as functions of temperature and pressure by a pulse-superposition technique. The values at 1 atm and 300°K are: c11 = 3.414, C′ = (c11—c12)/2 = 1.316, and c44 = 0.722, in units of 1011 dyn cm−2. Measurements of c11 and C′ were not made below the lambda transition at 234.5°K because of a sudden increase in attenuation; c44 was not attenuated in this manner and was measured from 105° to 320°K. The elastic constants were measured as functions of pressure between 0 and 12 kbar at constant temperatures which ranged from 255° to 315°K. In this region, which is far from the lambda line, disordered ammonium bromide behaves like a normal CsCl-type crystal.

This publication has 28 references indexed in Scilit: