The Effect of Potassium Doping on Specific Heat of Rare Earth Manganite RMnO3(R=La, Pr).

Archana Srivastava N.K.Gaur


We probe the  physical properties of rare earth manganites R1−xKxMnO3(R=La, Pr) like thermal expansion and Specific heat for their possible use as magnetic refrigerant material. Effect of Potassium doping (K+ at the A-site) on the thermal properties of perovskite RMnO3 has been considered in this investigation using the Modified Rigid Ion Model (MRIM)). The specific heat of magnetocaloric compounds La1−xKxMnO3­, and Pr1−xKxMnO3­ as a function of temperature (20K≤T≤1000K) is reported. In addition, the results on the cohesive energy (f), molecular force constant (¦), Reststrahlen frequency (no), Debye temperature (QD) and Gruneisen parameter (g) are also discussed. The monovalent cation (K+) doping results in anomalous change in Debye temperature for heavily doped La1−xKxMnO3­ beyond x=0.5. The Specific heat decreases with increase in content of potassium doping in La1−xKxMnO3 compound and it comes to a minimum for x=0.5 and then specific heat increases with further increase in doping concentration of Potassium in the LaMnO3

Keywords: Specific Heat, Magnetocaloric compounds, Thermal Properties, Bulk modulus, Colossal Magnetoresistance material, Manganites.

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ISSN (Paper)2224-719X ISSN (Online)2225-0638

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