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Crystals 2018, 8(2), 91; doi:10.3390/cryst8020091

Temperature-Induced Reversible and Irreversible Transitions between Metastable Perovskite Phases in the BiFe1−yScyO3 Solid Solutions

1
Department of Materials and Ceramic Engineering and CICECO—Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal
2
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
3
Element Six UK Ltd., Global Innovation Centre, Harwell Oxford, Didcot OX11 0QR, UK
4
Scientific-Practical Materials Research Centre of NAS of Belarus, P. Brovka Street, 19, Minsk 220072, Belarus
5
Institute of Technical Acoustics of NAS of Belarus, Lyudnikov Avenue, 13, Vitebsk 210023, Belarus
*
Authors to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 6 February 2018 / Accepted: 8 February 2018 / Published: 10 February 2018
(This article belongs to the Special Issue Non-Ambient Crystallography)
View Full-Text   |   Download PDF [2347 KB, uploaded 10 February 2018]   |  

Abstract

The antipolar orthorhombic Pnma phase with the 2 a p × 4 a p × 2 2 a p superstructure (ap ~4 Å is the pseudocubic perovskite unit-cell parameter) is observed in many perovskite compositions derived from BiFeO3. Temperature-induced structural transformations in metastable perovskite solid solutions with the Pnma structure corresponding to the range of 0.30 ≤ y ≤ 0.60 of the (1−y)BiFeO3-yBiScO3 quasi binary system were studied using temperature X-ray and neutron powder diffraction. These compositions cannot be prepared in bulk form at ambient pressure but can be stabilized in the Pnma phase by means of quenching after synthesis under high pressure. The compositions were investigated in situ between 1.5 K and the temperature of the stability limit of their metastable phases (about 870–920 K). It has been found that heating the as-prepared compositions with the Pnma phase leads to formation of the rhombohedral R3c phase ( 2 a p × 2 a p × 2 3 a p ), which, on cooling down to room temperature, either remains or transforms into a polar orthorhombic Ima2 phase ( 2 a p × 2 a p × 2 a p ). The observed phase transformations in the BiFe1−yScyO3 perovskite series on heating and on cooling are considered in terms of geometrical factors. View Full-Text
Keywords: metastable phase; high-pressure synthesis; perovskite; polymorphism metastable phase; high-pressure synthesis; perovskite; polymorphism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Salak, A.N.; Khalyavin, D.D.; Eardley, E.; Olekhnovich, N.M.; Pushkarev, A.V.; Radyush, Y.V.; Shilin, A.D.; Rubanik, V.V. Temperature-Induced Reversible and Irreversible Transitions between Metastable Perovskite Phases in the BiFe1−yScyO3 Solid Solutions. Crystals 2018, 8, 91.

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