Next Article in Journal
Specific Structural Disorder in an Anion Layer and Its Influence on Conducting Properties of New Crystals of the (BEDT-TTF)4A+[M3+(ox)3]G Family, Where G Is 2-Halopyridine; M Is Cr, Ga; A+ Is [K0.8(H3O)0.2]+
Next Article in Special Issue
P-T Phase Diagram of LuFe2O4
Previous Article in Journal
Reactive Hydride Composite of Mg2NiH4 with Borohydrides Eutectic Mixtures
Previous Article in Special Issue
Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Crystals 2018, 8(2), 91;

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
(This article belongs to the Special Issue Non-Ambient Crystallography)
Full-Text   |   PDF [2347 KB, uploaded 10 February 2018]   |  


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

Figure 1

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).

Share & Cite This Article

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Crystals EISSN 2073-4352 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top