resumo
Crystal structure of the Bi1-xPrxFeO3 ceramics of the compositions corresponding to the threshold concentrations separating the polar rhombohedral (R3c) and anti-polar orthorhombic (Pbam) phases has been investigated with X-ray diffraction, transmission electron microscopy and differential scanning calorimetry measurements performed in a broad temperature range. The structural study specifies the peculiarities of the temperature-driven transition into the non-polar orthorhombic (Pnma) phase depending on the structural state of the compounds at room temperature. The crystal structure analysis reveals the revival of the anti-polar orthorhombic phase upon the temperature-induced transition, thus assuming that it can be considered as the bridge phase between the polar rhombohedral and the non-polar orthorhombic phases.
palavras-chave
EARTH-SUBSTITUTED BIFEO3; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; SOLID-SOLUTIONS; TRANSITIONS; EVOLUTION; DIFFRACTION; BEHAVIOR
categoria
Materials Science
autores
Karpinsky, DV; Troyanchuk, IO; Willinger, M; Khomchenko, VA; Salak, AN; Sikolenko, V; Silibin, MV
nossos autores
Andrei Salak
Investigador Principal
Dzmitry Karpinski (Karpinsky)
Bolseiro de pós-Doutoramentoagradecimentos
The authors would like to acknowledge the BRFFR (Grant F16R-066), JINR-BRFFR (Grant F16D-008), RFBR (Grant 16-58-00082) and MK-1720.2017.8. V. A. K. is grateful to Fundacao para a Ciencia e a Tecnologia for financial support through the FCT Investigator Programme (Project IF/00819/2014). The work done at University of Aveiro was supported by the project TUMOCS. This project has received funding from the European Union's Horizon 2020 research and innovation programmeunder the Marie Sklodowska-Curie Grant No. 645660.