Magnetocaloric properties of Na-substituted perovskite-type manganese oxides

• Published in: Solid state communications Vol. 106; no. 1; pp. 55 - 58
• Main Authors: Zhong, Wei, Chen, Wei, Ding, Weiping, Zhang, Ning, Du, Youwei, Yan, Qijie
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.1998; Elsevier
• Subjects: A. magnetically ordered materials; Applied sciences; B. chemical synthesis; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical-point effects, specific heats, short-range order; D. order-disorder effects; D. spin dynamics; Domain effects, magnetization curves, and hysteresis; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Magnetic properties and materials; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Refrigerating engineering; Refrigerating engineering. Cryogenics. Food conservation; Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.); Techniques. Materials; A. magnetically ordered materials; B. chemical synthesis; D. spin dynamics; D. order-disorder effects; Temperature dependence; Inorganic compounds; Curie point; Magnetization; Magnetic field effects; Polycrystals; Entropy; Perovskites; Rare earth compounds; Magnetic refrigerators; Sodium Manganites; Magnetocaloric effects; Chemical composition; Application; Quaternary compounds; Lanthanum Manganites
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/S0038-1098(97)10239-3

The dependence of magnetization on the applied magnetic field and temperature was measured carefully near their Curie temperature for polycrystalline perovskite-type manganese oxides La 1− x Na x MnO 3 (0.05 < X ≤ 0.20) prepared by sol-gel technique. The large magnetic entropy changes upon an application of a low magnetic field and the convenient adjustment of the Curie temperature make the perovskite-type manganese oxides useful for magnetic refrigerants in an extended high temperature range even at room temperature.