Structural, magnetic, dielectric and mechanical properties of (Ba, Sr)MnO3 ceramics. Issue 4 (April 2017)

• Record Type: Journal Article
• Authors: Bujakiewicz-Koronska, R.; Nalecz, D.M.; Majcher, A.M.; Juszynska-Galazka, E.; Galazka, M.; Vasylechko, L.; Markiewicz, E.; Majda, D.; Kalvane, A.; Koronski, K.
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 4(2017)
• Page Start: 1477
• Page End: 1486
• Publication Date: 2017-04
• Subjects: Manganites -- Multiferroics -- SIESTA -- DSC -- FTIR; 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.2016.10.033
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Ceramic samples, produced by conventional sintering method in ambient air, 6H-SrMnO3 (6H-SMO), 15R-BaMnO3 (15R-BMO), 4H-Ba0.5 Sr0.5 MnO3 (4H-BSMO) were studied. In the XRD measurements for SMO the new anomalies of the lattice parameters at 600–800 K range and the increasing of thermal expansion coefficients with a clear maximum in a vicinity at 670 K were detected. The N e ´ el phase transition for BSMO was observed at T N = 250 K in magnetic measurements and its trace was detected in dielectric, FTIR, DSC, and DMA experiments. The enthalpy and entropy changes of the phase transition for BSMO at T N were determined as 17.5 J/mol and 70 mJ/K mol, respectively. The activation energy values and relaxation times characteristic for relaxation processes were determined from the Arrhenius law. Results of ab initio simulations showed that the contribution of the exchange correlation energy to the total energy is about 30%.