Browsing by Author "He, Di"
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Item Dielectric measurements of the proton-glass state in Rb0.65(NH4)0.35H2AsO4(1988-09) Trybuła, Z.; Schmidt, V. Hugo; Drumheller, John E.; He, Di; Li, ZhouningDielectric measurements of the Rb1−x/emph>(NH4)xH2AsO4 (x=0.35) mixed crystals in the a and c tetragonal directions in the temperature range from 3 to 300 K are reported. Below Tg a dielectric dispersion of ε’(T) and ε’’(T) in the applied frequency range from 1 Hz to 30 kHz was observed. A small anisotropy of the proton-glass transition temperature Tg was detected, but we did not find the large anisotropy reported by J. Kim, N. Kim, and K. Lee [J. Phys. C 21, L-663 (1988)].Item Proton Glass Dielectric Susceptibility Compared with Monte Carlo and Bound Charge Semiconductor Model Predictions(1990-06-01) Schmidt, V. Hugo; Trybula, Z.; He, Di; Drumheller, John E.; Stigers, C.; Li, Zhouning; Howell, Francis L.Our latest results for dielectric permittivity and loss and protonic conductivity in RADP, RADA and DRADA proton glasses are presented. Improvements in our “bound charge semiconductor” model for dielectric behavior are discussed. Monte Carlo studies of the phase diagram and polarization decay are described. Bias order parameter vs. temperature plots from the simulation and from ND4 deuteron NMR lineshapes are compared.