Phase formation in the (1-y)BiFeO3-yBiScO(3) system under ambient and high pressure
authors Salak, AN; Khalyavin, DD; Pushkarev, AV; Radyush, YV; Olekhnovich, NM; Shilin, AD; Rubanik, VV
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Metastable phase; High-pressure synthesis; Perovskite; Sillenite
keywords MICROWAVE DIELECTRIC-PROPERTIES; MAGNETIC-PROPERTIES; BIFEO3 CERAMICS; CRYSTAL-STRUCTURE; BISMUTH FERRITE; PEROVSKITE; POLAR; BIFE1-XMNXO3; POLARIZATION; FAMILY
abstract Formation and thermal stability of perovskite phases in the BiFel-yScyO3 system (0 <= y <= 0.70) were studied. When the iron-to-scandium substitution rate does not exceed about 15 at%, the single-phase perovskite ceramics with the rhombohedral R3c symmetry (as that of the parent compound, BiFeO3) can be prepared from the stoichiometric mixture of the respective oxides at ambient pressure. Thermal treatment of the oxide mixtures with a higher content of scandium results in formation of two main phases, namely a BiFeO3-like R3c phase and a cubic (Iota 23) sillenite-type phase based on gamma-Bi2O3. Single-phase perovskite ceramics of the BiFe1-yScyO3 composition were synthesized under high pressure from the thermally treated oxide mixtures. When y is between 0 and 0.25 the high-pressure prepared phase is the rhombohedral R3c with the root 2a(p)x root 2a(p),x2 root 3a(p) superstructure (a(p) similar to 4 angstrom is the pseudocubic perovskite unit-cell parameter). The orthorhombic Pnma phase (root 2a(p)x4a(p)x2 root 2a(p)) was obtained in the range of 0.30 <= y <= 0.60, while the monoclinic C2/c phase (root 6a(p)x root 2a(p)x root 6a(p)) is formed when y=0.70. The normalized unit-cell volume drops at the crossover from the rhombohedral to the orthorhombic composition range. The perovskite BiFe1-yScyO3 phases prepared under high pressure are metastable regardless of their symmetry. At ambient pressure, the phases with the compositions in the ranges of 0.20 <= y <= 0.25, 0.30 <= y < 0.50 and 0.50 <= y <= 0.70 start to decompose above 970, 920 and 870 K, respectively.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
isbn 1095-726X
year published 2017
volume 247
beginning page 90
ending page 96
digital object identifier (doi) 10.1016/j.jssc.2016.12.029
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000394478200014
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journal impact factor (jcr 2016): 2.299
5 year journal impact factor (jcr 2016): 2.208
category normalized journal impact factor percentile (jcr 2016): 57.118
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