R. Ghez, J.S. Lew
Journal of Crystal Growth
A high-resolution Brillouin scattering study of the soft acoustic mode of KH2PO4 in the hydrostatic-pressure range 0-4 kbar is presented. All spectra could be fitted closely by the usual mean-field coupled-mode model. From those fits, the pressure dependence of the ferroelectric-mode relaxation rate is derived. At pressures near and above the tricritical point, the transition can be approached so closely that the Brillouin spectrum becomes strongly overdamped and very narrow ( 50 MHz). Under those conditions, the elastic central peak of even the best available crystal becomes a dominant spectral feature, while the maximum dielectric constant is close to 106. © 1983 The American Physical Society.
R. Ghez, J.S. Lew
Journal of Crystal Growth
Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
K.A. Chao
Physical Review B
J.H. Kaufman, Owen R. Melroy, et al.
Synthetic Metals