Structural, magnetic, dielectric and mechanical properties of (Ba,Sr)MnO\(_3\) ceramics

Ceramic samples, produced by conventional sintering method in ambient air, 6H-SrMnO\(_3\)(6H-SMO), 15R-BaMnO\(_3\)(15R-BMO), 4H-Ba\(_{0.5}\)Sr\(_{0.5}\)MnO\(_3\)(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 o...

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Bibliographic Details
Published in:arXiv.org 2017-02
Main 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
Format: Article
Language:English
Subjects:
Anomalies
Barium
Dielectric properties
Enthalpy
Lattice parameters
Magnetic measurement
Magnetic properties
Manganese oxides
Mechanical properties
Phase transitions
Strontium
Thermal expansion
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Summary:Ceramic samples, produced by conventional sintering method in ambient air, 6H-SrMnO\(_3\)(6H-SMO), 15R-BaMnO\(_3\)(15R-BMO), 4H-Ba\(_{0.5}\)Sr\(_{0.5}\)MnO\(_3\)(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\(\acute{e}\)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%.
ISSN:2331-8422
DOI:10.48550/arxiv.1605.08006