14989-27-6Relevant articles and documents
Anisotropic glass freezing in rubidium/ammonium dihydrogen phosphate mixed crystal and its deuterated analogue
Ko,Kim,Kim,Fujimori,Miyajima
, p. 4403 - 4410 (1997)
Anisotropic glass freezing has been studied via dielectric measurements in the dipole glass systems of rubidium/ammonium dihydrogen phosophate RADP(x) and its perdeuterated analogue D-RADP(x), where x denotes the ammonium concentrations. The glass freezing temperatures for a-cut and c-cut crystals are measured, and found to reveal very small anisotropy in the protonated sample of RADP(0.43) but a considerable anisotropy (~7.2 K) at low frequency in the deuterated sample of D-RAPD(0.40). A higher glass freezing temperature was observed along the c-axis as compared with the a-axis freezing temperature for D-RADP(0.40) crystal. This conforms with the prediction of the cluster model theory for RADP(x a ? 11.5 kJ mol-1 along the a-axis and ΔEc ? 13.5 kJ mol-1 along the c-axis.