Effect of synthesis temperature on the structural behavior of   Ca0.95Sr0.05FeO2.5 compound

Mohammed Sadok MAHBOUB; Soria ZEROUAL; Ali BOUDJADA

Mohammed Sadok MAHBOUB Laboratoire d'exploitation et valorisation des ressources sahariennes, Département des Sciences de la matière, Faculté des Sciences et Technologie, Université d’El-Oued, B.P. 789 El-Oued RP, El-Oued 39000, ALGERIE
Soria ZEROUAL Laboratoire de Cristallographie, Département de Physique, Faculté des Sciences Exactes, Université Constantine 1, 25000, ALGERIE.
Ali BOUDJADA Effect of synthesis temperature on the structural behavior of Ca0.95Sr0.05FeO2.5 compound

Keywords: Ca1-xSrxFeO2.5, Chemical synthesis, Crystal symmetry, Mirror furnace, X-ray Powder diffraction

Abstract

Ca1-xSrxFeO2.5 (x=0, 0.05 and 0.1) samples are synthesized by both solid solution and mirror furnace methods, and the effect of synthesis temperature on the behaviour structure is investigated. The phase structures are comparatively characterized and studied by means of X-ray powder diffraction. Experimental results reveal that the synthesis temperature has a strong influence on the structure of the synthesized compounds. Samples obtained by solid solution method at 1473 K that they crystallizes in the orthorhombic lattice undergoes transition from primitive (Pnma space group) to body-centered (Imma or I2mb space group) up to x=0.1, whereas that obtained by mirror furnace method about 1900 K using melting zone technique show the transition at x=0.05. Both of synthesis methods were giving same lattice parameters values within the estimated standard deviation. Very high temperature applied during preparation in the ‘’mirror furnace method’’ has influencedon the arrangement of the FeO4 tetrahedra, and therefore on the Ca0.95Sr0.05FeO2.5 compound structure.