The Effect of Potassium Doping on Specific Heat of Rare Earth Manganite RMnO3(R=La, Pr).
Abstract
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.
![Download the IISTE publication guideline!](https://www.iiste.org/sub/iiste_footer_journal.jpg)
To list your conference here. Please contact the administrator of this platform.
Paper submission email: APTA@iiste.org
ISSN (Paper)2224-719X ISSN (Online)2225-0638
Please add our address "contact@iiste.org" into your email contact list.
This journal follows ISO 9001 management standard and licensed under a Creative Commons Attribution 3.0 License.
Copyright © www.iiste.org