(Видавництво Львівської політехніки, 2012) Kuz, O.; Handysh, V.; Prots, Yu.; Vasylechko, L.
The work deals with the study of the phase and structural behaviour of the rare-earth substituted BiFeO3. Xray powder diffraction examinations revealed that the polar
R3c phase in the Bi1-xRExFeO3 systems with RE = Er, Tm and Yb do not exceed 7, 4 and 3 mol.% of rare earth, respectively. Partial substitution of Er and Tm for the Bi
sites in BiFeO3 reduce the temperature of the ferroelectric phase transition R3c-Pbnm on 30-60 K.
(Видавництво Львівської політехніки, 2012) Vasylechko, L.; Bell, A. M. T.
Phase and structural behaviour of new mixed
cobaltites R1-xR’xCoO3 (R, R’ = La, Pr, Nd, Sm, Eu, Gd) and cobaltites-chromites RCo0.5Cr0.5O3 (R = Pr, Sm, Eu, Gd) has
been studied in the temperature range of 298–1173K. Strong anomalies in the lattice expansion reflecting the changes in spin state of Co3+ ions, are found. Correlations between the structural parameters, characteristic temperatures of thermal expansion coefficients and the temperatures of spinstate transitions in the mixed RE cobaltites has been established.
