Magnetic phase diagram, phase transitions, and cation distribution in Pb1-xBax(Fe0.5Nb0.5)O3 perovskites

Magnetic phase diagram of Pb1-xBax(Fe0.5Nb0.5)O3, x=0, 0.25, 0.5, 075, 1: TN – Néel temperature derived from MoS measurements, TG1 – occurring spin glass phase, TG2 - temperature of full presence of spin glass, TS – disappearing of AF phase, TD – occurring of PM phase. Empty diamonds (red, magenta,...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2022-04, Vol.278, p.115627, Article 115627
Main Authors: Kmječ, T., Adamec, M., Kubániová, D., Argymbek, B., Plocek, J., Dopita, M., Cejpek, P., Chlan, V., Hraníček, J., Kichanov, S.E., Závěta, K., Detlefs, B., Cesnek, M., Veverka, M., Štěpánková, H., Kohout, J.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cation distribution
Glass transition
Hyperfine interactions
Iron 57
Magnetic phase diagram
Magnetic properties
Mossbauer spectroscopy
Multiferroics
Neutron diffraction
NMR
Nuclear magnetic resonance
Perovskite
Perovskites
Phase diagrams
Phase transitions
Spectrum analysis
Spin glasses
Temperature
X ray powder diffraction
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Summary:Magnetic phase diagram of Pb1-xBax(Fe0.5Nb0.5)O3, x=0, 0.25, 0.5, 075, 1: TN – Néel temperature derived from MoS measurements, TG1 – occurring spin glass phase, TG2 - temperature of full presence of spin glass, TS – disappearing of AF phase, TD – occurring of PM phase. Empty diamonds (red, magenta, black) denote corresponding data from Ref. [1] for comparison. [Display omitted] •Dilution of Pb sublattice by Ba atoms lowers the Néel temperature TN.•Higher concentration of Ba leads to broader T transition interval from AFM to PM.•Regular arrangement of Fe and Nb atoms is gradually destroyed by replacing Pb with Ba.•Magnetic phase diagram of Pb1−xBax(Fe0.5Nb0.5)O3, x = 0–1, is presented. The 57Fe-enriched polycrystalline perovskite samples Pb1-xBax(Fe0.5Nb0.5)O3, x = 0.25, 0.5, 0.75 were prepared by a solid-state synthesis and studied in detail by X-ray powder diffraction (XRD), neutron diffraction, measurement of magnetic properties, Mössbauer spectroscopy (MoS), and nuclear magnetic resonance (NMR) in a wide temperature range. The temperature dependences of hyperfine, structural, and magnetic parameters were obtained, with particular attention to their values during magnetic and structural transitions. Relatively broad transitions to antiferromagnetically ordered state were observed in all samples. Néel temperatures TN were determined from the MoS spectra, the spin-glass transition was deduced from the characteristic behavior of the temperature dependences of ZFC/FC susceptibilities and remanent magnetization. Introduction of Ba into the structure gradually disrupts the long-range AFM order present in Pb(Fe0.5Nb0.5)O3, which leads to lowered TN and broadened transition. The magnetic phase diagram of Pb1−xBax(Fe0.5Nb0.5)O3 for the whole mixing interval Pb-Ba was obtained by combining the results of various methods.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2022.115627