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- W2568045661 abstract "Abstract Formation and thermal stability of perovskite phases in the BiFe 1- y Sc y O 3 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 R 3 c symmetry (as that of the parent compound, BiFeO 3 ) 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 BiFeO 3 -like R 3 c phase and a cubic ( I 23) sillenite-type phase based on γ-Bi 2 O 3 . Single-phase perovskite ceramics of the BiFe 1- y Sc y O 3 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 R 3 c with the √2 a p ×√2 a p ×2√3 a p superstructure ( a p ~ 4 A is the pseudocubic perovskite unit-cell parameter). The orthorhombic Pnma phase (√2 a p ×4 a p ×2√2 a p ) was obtained in the range of 0.30≤ y ≤0.60, while the monoclinic C 2/ c phase (√6 a p ×√2 a p ×√6 a 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 BiFe 1- y Sc y O 3 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 y ≤0.70 start to decompose above 970, 920 and 870 K, respectively." @default.
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- W2568045661 date "2017-03-01" @default.
- W2568045661 modified "2023-10-16" @default.
- W2568045661 title "Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure" @default.
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- W2568045661 doi "https://doi.org/10.1016/j.jssc.2016.12.029" @default.
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