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Abstract
Electrical conductivity, DTA (differential thermal analysis) and NMR measurements have been performed on the KHSO4 crystal. The results of DTA indicates that the KHSO4 crystal shows thermal anomalies at T c 2 = 393 K and T c 1 = 451 K. It is observed that electrical conductivity increases steeply above T c 2 . Especially, the motion of proton in each phase was investigated by the NMR measurements. It is also found that the NMR absorption lines above T c 1 become narrow, although the NMR absorption line at 77 K is broad. it is expected that all protons in the crystal move rapidly above T c 1 . Moreover electrical conductivity is 10−1 S/cm above T c 1 . These results indicate that the KHSO4 crystal becomes super-ionic conductor above T c 1 .