Study on nuclear magnetic resonance of superionic conductor NH4HSeO4 in rotating frame

In order to obtain information on the structural geometry of NH4HSeO4 near the phase transition temperature, the spectrum and spin- lattice relaxation time in the rotating frame T-1p for the ammonium and hydrogen-bond protons were investigated through H-1 MAS NMR. T-1p for the hydrogen- bond protons abruptly decreased at high temperature and it is associated with the change in the structural geometry in O-H ... O bonds. This mobility of the hydrogen- bond protons may be the main reason for the high conductivity.