Low-temperature anomaly of ionic conductivity in an Na4 + xFeP2O8 + xF1 - x (x ~= 0.5) superionic conductor Ivanov-Schitz, A. K. ; Verin, I. A. ; Nakamura, O. ; Fujieda, T. Abstract Publication: Crystallography Reports Pub Date: January 1995 Bibcode: 1995CryRp..40..173I