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

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.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, Cochin University of Science and Technology, Cochin 682022, Kerala (India)
  2. Department of Physics, Sultan Qaboos University, PC 123 Muscat, Sultanate of Oman (Oman)
  3. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India)
Publication Date:
OSTI Identifier:
22283051
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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