Structural and Elastic Behavior of Chromium Doped Pr0.5Sr0.5MnO3 System

Document pages: 10 pages

Abstract: A series of colossal magneto resistance (CMR) materials withcompositional formula Pr0.5Sr0.5Mn1-xCrxO3 (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by sol-gel technique using pure metalnitrates as the starting materials. These samples were characterizedstructurally by X-ray diffraction, FTIR and SEM. All the samples exhibit orthorhombic structure without anydetectable impurities. The bulk densities for all the compositions weremeasured from the pellets. The Young’s and Rigidity moduli, Poisson’s ratio andDebye temperature of all the compositions were calculated with theexperimentally measured ultrasonic longitudinaland shear velocities at room temperature using pulse transmissiontechnique. As the materials are porous, zero porous elastic moduli have alsobeen calculated using a well-known Hasselmann and Fulrath model. The observed variation of elastic moduli withvarying chromium doping concentration has been studied qualitatively.