Synthesis and structural characterization of the Ca2MnReO6 double Perovskite
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The Ca2
Mn1
Re1
O6
double perovskite has been prepared in polycrystalline form by using the encapsulated quartz tube method.
The partial oxygen pressure inside the quartz tube revealed this to be a crucial synthesis parameter for the production of a
single structural phase sample. This parameter was controlled using the ratio between ReO2
and ReO3
content and the filling
factor parameter (ratio between mass and total inner volume of the quartz tube). The morphology and chemical composition
was investigated by scanning electron microscopy and energy dispersive X-ray spectroscopy. The crystal structure parameters
were determined by analysis of the synchrotron high-resolution X-ray powder diffraction pattern. The analysis indicates that
the sample is an ideal single-phase compound with a monoclinic crystal structure (space group P21
/n) with a = 5.44445(2) Å;
b = 5.63957(3) Å; c = 7.77524(3) Å; and β = 90.18(1)º. Computer simulations were performed considering two cation valence
configurations, namely, (i) Mn2+Re6+ or (ii) Mn3+Re5+, for the Ca2
Mn1
Re1
O6
compound. XANES analysis measurements indicated
+2.3 for the average valence of Mn (a mixture of Mn2+ and Mn3+) and +5.7 for the effective valence of Re (an intermediate valence
between Re4+ (ReO2
) and Re6+ (ReO3
)). As a summary, we concluded there is a mixed valence configuration for Mn and Re in
Ca2
Mn1
Re1
O6 , taken into account the oxygen content of 6.0±0.1 .
Como referenciar
CORREA, H.P.S.; CAVALCANTE, I.P.; SOUZA, D.O.; SANTOS, E.Z.; ORLANDO, M.T.D.; BELICH, H.; SILVA, F.J.; MEDEIRO, E.F.; PIRES, J.M.; PASSAMAI, J.L.; MARTINEZ, L.G.; ROSSI, J.L. Synthesis and structural characterization of the Ca2MnReO6 double Perovskite. Cerâmica, v. 56, n. 338, p. 193-200, 2010. DOI: 10.1590/s0366-69132010000200015. Disponível em: http://repositorio.ipen.br/handle/123456789/8131. Acesso em: 27 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.