Структура и электропроводность перовскитов Pr-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=- (x=0; 0.15; 0.25)

Abstract

Pr1-xSrxMnO3 manganites (x=0; 0.15; 0.25) were synthesized by the solid-phase method at a temperature of 1250°C and have an orthorhombic perovskite-like structure (space group Pbnm). A comprehensive study of the effect of praseodymium substitution with strontium on the temperature features of the transformation of the crystal structure of the studied perovskites was performed using high-temperature radiography and differential thermal analysis. It was determined that the temperature of the Jahn-Тeller effect significantly decreases with the introduction of strontium. It is established that all samples have a semiconductor character of conductivity. Strontium doping significantly increases the electrical conductivity of praseodymium manganites, especially at temperatures below 450°C.