AG3SBR AND AG3SI - IONIC-CONDUCTIVITY OF THEIR MODIFICATIONS IN THE T-RANGE 93-573K

Ag3SBr and Ag3SI obtained through a modified preparation procedure have been investigated in the temperature range 93-573 by means of conductivity, DTA and X-ray diffraction determinations. At the phase transi ion temperatures the Arrhenius plot of the conductivity shows evident discontinuities, whereas in the range where Ag3SBr and Ag3SI have an antiperovskitic structure this plot shows an upward curvature: for Ag3SBr a reproducible “knee” is also observed. The recently recognized[9] low modifications of these compounds are poorly conducting. The general behaviour of the conductivity inthe wide investigated range suggests a direct comparison between these salts and RbAg4I5which shows analogous phase transitions and discontinuities in the Arrhenius plot of the conductivity. Electronic conductivity determinations confirm that the charge transport is predominantly ionic in either compound. © by Akademische Verlagsgesellschaft, Wiesbaden 1979