Magnetic properties and near-room-temperature large magnetocaloric effect in (La1-xBix)0.67Ba0.33MnO3 (x = 0 - 0.3) ceramics. (January 2021)

• Record Type: Journal Article
• Authors: Biswal, Hrudananda; Singh, Vikram; Nath, R.; Sahu, Jyoti Ranjan
• Is Part Of: Materials research bulletin. Volume 133(2021)
• Publication Date: 2021-01
• Subjects: Ceramics -- Magnetic -- Magnetocaloric -- Hysteresis -- Magnetic entropy change -- Relative cooling power; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.111030
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: (La1-x Bix )0.67 Ba0.33 MnO3 (x = 0-0.3) ceramics are synthesized through solid state reaction method. Due to decrease in electronic bandwidth induced by Bi substitution, decrease in ferromagnetic TC is noticed. Occurrence of Griffiths phase becomes prominent for higher Bi contents. Positive slopes in Arrott plots confirm second order magnetic transition from PM to FM state. Remarkable enhancement in relative cooling power (RCP) is observed which makes them suitable for magnetic refrigeration. Abstract: The magnetic and magnetocaloric properties of (La1-x Bix )0.67 Ba0.33 MnO3 (for x = 0 - 0.3) ceramics are reported. Magnetization measurements reveal the onset of a ferromagnetic ordering ( TC ) in the range 336 K- 229 K which shifts towards low temperatures with increasing x . Magnetocaloric effect ( MCE ) measurements yield the maximum value of entropy change ( - Δ S M m a x ) around TC that decreases from ∼6.19 J/ Kg/K for x = 0 to ∼4.79 J/ Kg/K for x = 0.3 for a field change of 9 T. Remarkable enhancement in the relative cooling power ( RCP ) is observed with the value increasing from ∼400.45 J/Kg for x = 0 to ∼472.81 J/Kg for x = 0.3. The substantial increase in the magnetocaloric properties of (La1-x Bix )0.67 Ba0.33 MnO3 compounds compared to other compounds reported in the literature makes them potential candidates to be used for magnetic refrigeration purposes.