resumo
Magnetic properties of the high-pressure stabilized perovskite BiFe1-yScyO3 phases (0.1 <= y <= 0.9) have been studied by means of magnetization measurements and neutron diffraction. The metastable perovskites of this series undergo irreversible polymorphic transformations upon annealing, the phenomenon referred to as conversion polymorphism. It has been found that the solid solutions with y >= 0.70 exhibit no long-range magnetic ordering regardless of their polymorph modification, while those with y <= 0.60 are all antiferromagnets. Depending on the scandium content, temperature and structural distortions, three types of the antiferromagnetic orderings, involving collinear, canted and cycloidal spin arrangements, have been revealed in the phases obtained via conversion polymorphism and the corresponding magnetic phase diagram has been suggested.
palavras-chave
CRYSTAL-STRUCTURE; AMBIENT
categoria
Crystallography; Materials Science
autores
Fertman, EL; Fedorchenko, AV; Cizmar, E; Vorobiov, S; Feher, A; Radyush, YV; Pushkarev, AV; Olekhnovich, NM; Stanulis, A; Barron, AR; Khalyavin, DD; Salak, AN
nossos autores
Andrei Salak
Investigador Principal
agradecimentos
The authors acknowledge the financial support of the bilateral Slovakia-Belarus project Novel environment-friendly materials for microelectronics based on complex bismuth-containing oxides with perovskite structure synthesized under high pressure through grants APVV-SK-BY-RD-19-0008 and T20SLKG-001, respectively. Support of P.J. Safarik University in Koice through grant VVGS-2020-1403 is also acknowledged. The research performed in the University of Aveiro was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. Additional funding was provided by the Flexible Integrated Energy Systems (FLEXIS) operations funded by the Welsh European Funding Office (WEFO) through the Welsh Government.