Metastable perovskite Bi1-xLaxFe0.5Sc0.5O3 phases in the range of the compositional crossover. (2nd September 2017)

• Record Type: Journal Article
• Authors: Salak, A. N.; Khalyavin, D. D.; Zamaraite, I.; Stanulis, A.; Kareiva, A.; Shilin, A. D.; Rubanik, V. V.; Radyush, Yu. V.; Pushkarev, A. V.; Olekhnovich, N. M.; Starykevich, M.; Grigalaitis, R.; Ivanov, M.; Banys, J.
• Is Part Of: Phase transitions. Volume 90:Number 9(2017)
• Page Start: 831
• Page End: 839
• Publication Date: 2017-09-02
• Subjects: Multiferroic -- metastable phase -- sol-gel method -- high-pressure synthesis; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2017.1290802
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: Perovskite ceramics of the Bi1- x La x Fe0.5 Sc0.5 O3 composition (0.30 ≤ x ≤ 0.35) that cannot be sintered in bulk form as a single phase using the conventional ceramic route were successfully prepared using the high-pressure/high-temperature technique. It has been shown that the room-temperature compositional crossover from the antipolar phase whose incommensurate modulation of displacements of Bi/La and oxygen is described by the Imma (00γ)s00 superspace group to the non-polar Pnma phase occurs in the narrow range between x = 0.33 and x = 0.34 with no phase coexistence. The features of this compositional crossover are discussed in comparison with that observed in the Bi1- x La x FeO3 system.