Magnetic entropy change in La0.54Ca0.32MnO3−δ

Xu, Qingyu; Gu, Kaichen; Liang, Xinzeng; Ni, Gang; Wang, Z. M.; Sang, H.; Du, You Wei

doi:10.1063/1.1379047

Cited by 26 publications

(10 citation statements)

References 13 publications

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“…The effect of the double-exchange interaction between Mn 3+ and Mn 4+ ratio could be closely related to the change in the Mn 3+ /Mn 4+ ratio with different contents of the La deficiency [13][14][15]. The enhancement in magnetic entropy change could be caused by the change of the double-exchange interaction of Mn 3+ and Mn 4+ ions and the strong spin-lattice coupling arising from a reasonable variation in Mn-O bond and Mn-O-Mn bond angle [5,7,16]. The cell volumes calculated from the X-ray data for x = 0.00, 0.02, 0.06, and 0.10 are 0.233(1), 0.227(5), 0.231(3), and 0.231(5) nm 3 , respectively.…”

Section: Resultsmentioning

confidence: 92%

“…The vacancy concentration in the A site will influence the V Mn , thereby having an effect on the electronic and magnetic properties of these compounds. Some work has been carried out recently concerning hole doping at the A site in perovskite manganites [5][6][7][8]. It is worth noting that the Curie temperatures of the material doped with different concentrations of vacancies in the La site have increased and the magnetic entropy changes, that are important for magnetic refrigeration, have been enhanced.…”

Section: Introductionmentioning

confidence: 98%

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Magnetic entropy change in La0.67−Ca0.33MnO3

Hou

Bai

et al. 2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

Magnetic entropy change in La0.67−Ca0.33MnO3

Hou

Bai

et al. 2004

Journal of Alloys and Compounds

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“…6a- [3]. The magnetic entropy change, and the RCP values are larger than most of the reported perovskite materials [3,11,15,17,19,23,24]. Substitution of Pr with La into LAM reveals an increasement at the temperature intervals of magnetic entropy change curve.…”

Section: Fig 3 M(t ) For the (A)mentioning

confidence: 86%

Magnetocaloric Properties of La0.85Ag0.15MnO3 and (La0.80Pr0.20)0.85Ag0.15MnO3 Compounds

Ayaş

Akyol

Çetin

et al. 2015

J Supercond Nov Magn

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In this work, the structural and magnetic properties of the polycrystalline La 0.85 Ag 0.15 MnO 3 (LAM) and (La 0.80 Pr 0.20 ) 0.85 Ag 0.15 MnO 3 (LPAM) compounds prepared by the sol-gel method were investigated. The structural properties of both polycrystalline compounds were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectrum (EDX) methods. The XRD results showed that both samples crystallized in the hexagonal symmetry with R3c space group. The SEM images showed that the particles are closely packed with each other, and their size range from 0.5 to 2.0 μm with the average sizes of 1.23 and 1.03 μm, for LAM and LPAM, respectively. From the EDX spectrum, in both compounds, we did not see loss of any integrated elements during the sintering process and no other impurity elements. The magnetic properties were studied by employing temperature M(T ) and external magnetic field M(H ) dependence of magnetization measurements. Both compounds showed magnetic phase transition from paramagnetic to ferromagnetic phase. With the substitution of Pr for La, the Curie temperature, T C , decreased from 262 to 216 K. At a field change of 5 T, LAM and LPAM showed large magnetic entropy changes of 7.90 and 4.96 J kg −1 K −1 , respectively. Furthermore, their relative cooling power (RCP) values were found as 213.32 and .02 J kg −1 , respectively. These findings make both LAM and LPAM compounds as good candidates for the practical magnetic refrigeration.

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“…Another contribution to the large magnetic entropy change is believed to be related to the considerable variation of magnetization near T C [23]. However, the strong spin lattice coupling arising from a reasonable variation (Mn-O) bond and (Mn-O-Mn) bond angle at T C may also contribute to the enhancement of magnetic entropy change [24,25] observed.…”

Section: Resultsmentioning

confidence: 81%