Preparation, thermal and phase evolution and functional properties of non-stoichiometric strontium-doped lanthanum manganite perovskite ceramics. Issue 11 (September 2017)

• Record Type: Journal Article
• Authors: Colomer, M.T.; Ortiz, A.L.; López-Domínguez, V.; Alonso, J.M.; García, M.A.
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 11(2017)
• Page Start: 3527
• Page End: 3533
• Publication Date: 2017-09
• Subjects: Powders-chemical preparation -- Perovskites -- Electron microscopy -- Magnetic properties -- Electrical conductivity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.04.019
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Powders of (La0.85 Sr0.15 )0.98 MnO3-δ (LSM85) and (La0.80 Sr0.20 )0.98 MnO3-δ (LSM80) perovskites have been synthesized and characterized in detail, and then sintered to evaluate their electrical and magnetic properties at low temperatures and at near room temperature. Microstructural observations/analyses after the dilatometric essays show that the perovskites have compositions that deviate from the nominal ones. Furthermore, magnetic characterization of both samples reveals a ferromagnetic behavior with a Curie temperature above 300 K for LSM80 and of 260 K for LSM85. In addition, LSM85 is insulator from 15 up to 300 K, whereas LSM80 is metallic up to 160 K and insulator up to 300 K. This significant discrepancy of behaviour is attributable to structural and compositional differences between the two perovskites.