resumo
The (1-x)BiFeO3-xBiZn(0.5)Ti(0.5)O(3) solid solutions (0.05 <= x <= 0.25) were prepared using high-pressure synthesis. Up to 25 at.% substitutions of Fe by the combination of [Mg0.5Ti0.5] were found to increase the unit cell volume of the primitive perovskite cell, while the crystal structure remains the rhombohedral perovskite, as that in the parent BiFeO3. With increasing temperature, the as-prepared ceramics of the x = 0.25 composition reversibly transform into a cubic modification between about 970 and 1070 K. However, this phase transition is overlapped with a gradual decomposition of the perovskite phase, which starts above 770 K. The perovskite phase with the substitution rate corresponding to x = 0.25 is antiferromagnetic below T (N)similar to 460 K. Peculiarities of the temperature-dependent magnetic behavior of this composition at about 220 and 315 K, which might indicate transitions between the states with different magnetic orderings, have been observed.
palavras-chave
POLARIZATION; CERAMICS
categoria
Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter
autores
Cizmar, E; Vorobiov, S; Kliuikov, A; Radyush, YV; Pushkarev, AV; Olekhnovich, NM; Cardoso, JP; Salak, AN; Feher, A
nossos autores
Andrei Salak
Investigador Principal
João Pedro Veleirinho Cardoso
Estudante de doutoramentoagradecimentos
The authors acknowledge the financial support of the bilateral Slovakia-Belarus project APVVSK-BY-RD-19-0008 and T20SLKG-001, respectively. E. Cizmar and A. Feher were also supported by the Scientific Grant Agency of Ministry of Education, Science, Research and Sport of the Slovak Republic under contract VEGA 1/0426/19 and by the P.J.Safarik University in Kosice through grant VVGS-2020-1484. J.P. Cardoso is grateful to the FCT -Portuguese Foundation for Science and Technology for the PhD grant SFRH/BD/145281/2019. The research done in the University of Aveiro was supported by the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES.