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	STUDIA PHYSICA - Ediţia nr.1-2 din 2021

	Articol:	NEAR ROOM-TEMPERATURE TEMPERATURE MAGNETOCALORIC EFFECT IN Pr_0.63-xHo_xSr_0.37MnO₃ MANGANITES. Autori: ALEXANDRA LUDOȘAN, IOSIF G. DEAC.


	Rezumat: DOI: 10.24193/subbphys.2021.07 Published Online: 2021-12-30 Published Print: 2021-12-30 pp. 69-78 VIEW PDF FULL PDF Near room-temperature magnetic and magnetocaloric properties of the compounds Pr_0.63-xHo_xSr_0.37MnO₃ (x=0, 0.05) were investigated. The parent compound Pr_0.63Sr_0.37MnO₃ has a large magnetocaloric effect around its Curie temperatures of about 300 K. Partially replacing of Pr³⁺ ions with Ho³⁺ ions in Pr_0.63Sr_0.37MnO₃ gives rise to disorder which leads to the decrease of the Curie temperature without a significant reduction of the magnetocaloric effect. The samples were prepared by solid state reaction and were found to be single phase by x-ray diffraction. The magnetic measurements reveal paramagnetic to ferromagnetic second order phase transitions. For the sample with x = 0, the magnetic entropy change \|ΔS_M\| was in the range from 1.91 J/kg٠K (RCP = 42 J/kg) for μ ₀ ΔH = 1 T to 4.86 J/kg٠K (RCP = 184 J/kg) for μ ₀ ΔH = 4 T. For the sample with x = 0.05, the magnetic entropy change \|ΔS_M\| was in the range from 1.61 J/kg٠K (RCP = 57.9 J/kg) for μ ₀ ΔH = 1 T to 4.38 J/kg٠K (RCP = 236 J/kg) for μ ₀ ΔH = 4 T and T_c = 216 K. These values recommend these materials to be potential candidates to be used in near room-temperature refrigeration applications. Keywords: Perovskite manganites, phase transition, magnetocaloric effect.




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