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Erschienen in:
28.08.2017
Structural, magnetic and magnetocaloric investigation of La0.7−xDyxCa0.3MnO3 (x = 0.00, 0.01 and 0.03) manganite
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 22/2017
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Abstract
La0.7−xDyxCa0.3MnO3 (x = 0.00, 0.01 and 0.03) compounds were prepared using sol–gel method. X- ray diffraction and magnetic measurements were used to investigate the effects of Dy doping on the physical properties of La0.7−xDyxCa0.3MnO3. XRD data have been analyzed by Rietveld refinement technique. Moreover they crystallized in an orthorhombic structure with Pnma space group. Magnetization as a function of temperature has shown that these compounds exhibit a transition from a ferromagnetic to paramagnetic phase with increasing temperature. The \(\Delta {\text{S}}_{{\text{M}}}^{{{\text{max}}}}\) in a magnetic field change of 5 T is found to be 6.79, 10.15 and 3.97 J Kg−1 K−1 for x = 0.00, 0.01 and 0.03, respectively. At this value of magnetic field, the relative cooling power (RCP) is found to be 191, 155 and 157 J Kg−1 for x = 0.00, 0.01 and 0.03, respectively. Our result on magnetocaloric properties suggests that La0.7−xDyxCa0.3MnO3 (x = 0.00, 0.01 and 0.03) compounds are attractive as possible refrigerants for near room temperature magnetic refrigeration.