Near fifty percent sodium substituted lanthanum manganites—A potential magnetic refrigerant for room temperature applications

Journal Article · Mon Mar 03 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4867528· OSTI ID:22283051

Sethulakshmi, N.; Al-Omari, I. A. ^[1]; Suresh, K. G. ^[2]

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1. Department of Physics, Sultan Qaboos University, PC 123 Muscat, Sultanate of Oman (Oman)
2. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India)

Nearly half of lanthanum sites in lanthanum manganites were substituted with monovalent ion-sodium and the compound possessed distorted orthorhombic structure. Ferromagnetic ordering at 300 K and the magnetic isotherms at different temperature ranges were analyzed for estimating magnetic entropy variation. Magnetic entropy change of 1.5 J·kg{sup −1}·K{sup −1} was observed near 300 K. An appreciable magnetocaloric effect was also observed for a wide range of temperatures near 300 K for small magnetic field variation. Heat capacity was measured for temperatures lower than 300 K and the adiabatic temperature change increases with increase in temperature with a maximum of 0.62 K at 280 K.

• OSTI ID: 22283051
• Journal Information: Applied Physics Letters, Vol. 104, Issue 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADIABATIC DEMAGNETIZATION
ENTROPY
ISOTHERMS
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MANGANATES
ORTHORHOMBIC LATTICES
SODIUM
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K