Synthesis, Structural Characterization and Mössbauer Study of LnV0.5Fe0.5O3 Perovskites (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er)

FLÁVIO FRANCISCO IVASHITA; VALDECIR BIONDO; JUSMAR VALENTIN BELLINI; ANDREA PAESANO JR.; MARÍA CECILIA BLANCO; VALERIA CINTIA FUERTES; ELISA V. PANNUNZIO MINER; RAÚL ERNESTO CARBONIO

MATERIALS RESEARCH BULLETIN

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2012 vol. 47 p. 2227 - 2227

0025-5408

erovskites LnV0.5Fe0.5O3 (Ln = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er) were synthesized by rapidsolidification from arc-melted samples and characterized by the study of their crystal structure andhyperfine properties. These metastable solid solutions crystallized in the Pbnm symmetry, with the ironand vanadium cations randomly distributed in the transition metal octahedral sites. Depending on thelanthanide present at the A site of the perovskite, iron is present with two valences (i.e., Fe3+ and Fe2+).The volume of the unit cell for these perovskites increases linearly with the lanthanide ionic radius, asthe perovskite approaches its ideal structure. At room temperature, the quadrupolar splitting of thetrivalent paramagnetic Mossbauer component works as an indirect measurement for the Goldshmidttolerance factor. Close to or below 100 K, these perovskites undergo a crystallographic phasetransformation, probably due to orbital ordering of the V3+ cations, originating two diffe