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Ultrasonic studies of attenuation and dispersion in NH4Br near the order-disorder transition |
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| Authors: | CW Garland G Gorodetsky D Moreno J Pelleg |
| Institution: | Department of Chemistry and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.;Department of Physics, Ben Gurion University of the Negev, Beer-Sheva, Israel;Department of Materials Engineering, Ben Gurion University of the Negev, Beer-Sheva, Israel |
| Abstract: | Velocity and attenuation of sound wave propagation along the 100] direction in NH4Br were measured near its transition temperature Tc = 234.5 K at frequencies of 30–150 MHz. The experimental results for the high-frequency attenuation and the dispersive velocity shifts are found to be in good agreement with the model of a single critical relaxation time. |
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