Deuteron NMR and a Model for Phase Transitions in Monoclinic RbD 2 PO 4 .
Schmidt, V. Hugo
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The quadrupole-perturbed deuteron NMR spectra and spin-lattice relaxation times of monoclinic RbD2PO4 have been measured and the electric-field-gradient tensors at the deuteron sites have been determined in phase I at 110 °C, phase III at 80 °C, and phase III at 40 °C. The results are incompatible with a location of the D(2) and D(3) deuterons in the center of the corresponding H bonds. They show that these deuterons are disordered between two off-center sites in phases I and II, whereas they are ordered in phases III and IV. A four-sublattice model accounting for all four phase transitions in monoclinic RbD2PO4 is proposed.
Jarh, O., J. DolinÅ¡ek, B. TopiÄ�, B. Å½ekÅ¡, R. Blinc, V. H. Schmidt, L. A. Shuvalov, and A. Baranov. â€œ Deuteron NMR and a Model for Phase Transitions in Monoclinic RbD 2 PO 4 .â€� Phys. Rev. B 39, no. 4 (February 1989): 2004â€“2011. doi:10.1103/physrevb.39.2004.