Temperature-Induced Reversible and Irreversible Transitions between Metastable Perovskite Phases in the BiFe1−yScyO3 Solid Solutions
Department of Materials and Ceramic Engineering and CICECO—Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
Element Six UK Ltd., Global Innovation Centre, Harwell Oxford, Didcot OX11 0QR, UK
Scientific-Practical Materials Research Centre of NAS of Belarus, P. Brovka Street, 19, Minsk 220072, Belarus
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
The antipolar orthorhombic Pnma
phase with the
~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
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 R
), which, on cooling down to room temperature, either remains or transforms into a polar orthorhombic Ima
2 phase (
). The observed phase transformations in the BiFe1−y
perovskite series on heating and on cooling are considered in terms of geometrical factors.
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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.
Salak AN, Khalyavin DD, Eardley E, Olekhnovich NM, Pushkarev AV, Radyush YV, Shilin AD, Rubanik VV. Temperature-Induced Reversible and Irreversible Transitions between Metastable Perovskite Phases in the BiFe1−yScyO3 Solid Solutions. Crystals. 2018; 8(2):91.
Salak, Andrei N.; Khalyavin, Dmitry D.; Eardley, Edwin; Olekhnovich, Nikolai M.; Pushkarev, Anatoli V.; Radyush, Yury V.; Shilin, Aleksandr D.; Rubanik, Vasili V. 2018. "Temperature-Induced Reversible and Irreversible Transitions between Metastable Perovskite Phases in the BiFe1−yScyO3 Solid Solutions." Crystals 8, no. 2: 91.
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