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Crystals 2017, 7(10), 301;

Impact of Annealing Temperature on the Physical Properties of the Lanthanum Deficiency Manganites

Center for Functionalized Magnetic Materials (FunMagMa), Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia
Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, B.P. 802, Université de Sfax, Sfax 3018, Tunisie
Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble CEDEX 9, France
Author to whom correspondence should be addressed.
Received: 20 August 2017 / Revised: 22 September 2017 / Accepted: 2 October 2017 / Published: 5 October 2017
(This article belongs to the Special Issue Crystal Structure of Magnetic Materials)
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The lanthanum deficiency manganites La0.8-x□xCa0.2MnO3 (x = 0, 0.1 and 0.2), where □ is a lanthanum vacancy, were prepared using the classic ceramic methods with different thermal treatments (1373 K and 973 K). The structural, magnetic, and magnetocaloric properties of these compounds were studied as a function of annealing temperature. It was noted that the annealing temperature did not affect the crystal structure of our samples (orthorhombic structure with Pnma space group). Nevertheless, a change in the variation of the unit cell volume V, the average bond length dMn–O, and the average bond angles θMn–O–Mn were observed. Magnetization versus temperature study has shown that all samples exhibited a magnetic transition from ferromagnetic (FM) to paramagnetic (PM) phase with increasing temperature. However, it can be clearly seen that the annealing at 973 K induced an increase of the magnetization. In addition, the magnetocaloric effect (MCE) as well as the relative cooling power (RCP) were estimated. As an important result, the values of MCE and RCP in our Lanthanum-deficiency manganites are reported to be near to those found in gadolinium, considered as magnetocaloric reference material. View Full-Text
Keywords: vacancy manganites; thermal treatments; magnetocaloric effect vacancy manganites; thermal treatments; magnetocaloric effect

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Ridha, S.; Essebti, D.; Hlil, E.K. Impact of Annealing Temperature on the Physical Properties of the Lanthanum Deficiency Manganites. Crystals 2017, 7, 301.

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