FREQUENCY SHIFTS NEAR THE FIRST ORDER PHASE TRANSITION IN $NH_{4}Cl$
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Date
1999
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Ohio State University
Abstract
We study here our correlations between the volume changes and the frequency shifts for the q[110] mode of $NH_{4}Cl$ for the pressures of $0, 0.5$ and $0.95$ kbars (first order phase region). By determing the mode Gr\""{u}neisen parameter for the q[110] mode, we have predicted the ultrasonic frequencies for this mode using the length-change measurements for the $NH_{4}Cl$ crystals from the literature. Our calculated frequencies are in good agreement with the observed frequencies for the q[110] mode in the first order phase region of $NH_{4}Cl$. This shows that our method of calculating the frequencies from the observed length-change data is reasonable and that we can then predict the observed behaviour of $NH_{4}Cl$.
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Author Institution: Department of Physics, Istanbul Technical University