resumo
The phase content and sequence, the crystal structure, and the magnetic properties of perovskite solid solutions of the (1-y)BiFeO3-yBiZn(0.5)Ti(0.5)O(3) series (0.05 & LE; y & LE; 0.90) synthesized under high pressure have been studied. Two perovskite phases, namely the rhombohedral R3c and the tetragonal P4mm, which correspond to the structural types of the end members, BiFeO3 and BiZn0.5Ti0.5O3, respectively, were revealed in the as-synthesized samples. The rhombohedral and the tetragonal phases were found to coexist in the compositional range of 0.30 & LE; y & LE; 0.90. Magnetic properties of the BiFe1-y[Zn0.5Ti0.5](y)O-3 ceramics with y < 0.30 were measured as a function of temperature. The obtained compositional variations of the normalized unit-cell volume and the Neel temperature of the BiFe1-y[Zn0.5Ti0.5](y)O-3 perovskites in the range of their rhombohedral phase were compared with the respective dependences for the BiFe1-yBy3+O3 perovskites (where B3+ = Ga, Co, Mn, Cr, and Sc). The role of the high-pressure synthesis in the formation of the antiferromagnetic states different from the modulated cycloidal one characteristic of the parent BiFeO3 is discussed.
palavras-chave
CRYSTAL-STRUCTURE; PHASE-TRANSITIONS; POLAR; POLARIZATION; BOUNDARY; AMBIENT
categoria
Chemistry, Inorganic & Nuclear; Chemistry, Physical; Materials Science, Multidisciplinary
autores
Salak, AN; Cardoso, JPV; Vieira, JM; Shvartsman, VV; Khalyavin, DD; Fertman, EL; Fedorchenko, AV; Pushkarev, AV; Radyush, YV; Olekhnovich, NM; Tarasenko, R; Feher, A; Cizmar, E
nossos autores
Andrei Salak
Investigador Principal
Joaquim Manuel Vieira
Professor(a) Jubilado(a)Grupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
This work was done in the frame of the bilateral Slovakia-Belarus project APVV SK-BY-RD-19-0008/T20SLKG-001 funded by the Slovak Research and Development Agency and the Belarusian Republican Foundation for Fundamental Research, respectively. J.P.V.C acknowledges the financial support of FCT-the Portuguese Foundation for Science and Technology for the Ph.D. grant SFRH/BD/145281/2019. A.N.S. acknowledges the financial support of national funds (OE) through FCT-Portugal in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of 29 August, changed by Law 57/2017, of 19 July. The research done in University of Aveiro was supported by the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology (FCT)/MCTES.