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Inicio » Actividades I+D > Publicaciones 2001 > Structural Phase Diagram of Ca1-xYxMnO3:...
artículo con referato
"Structural Phase Diagram of Ca1-xYxMnO3: Characterization of Phases"
D. Vega, G. Polla, A.G. Leyva, P. König, H. Lanza, A. Esteban, H. Aliaga, M.T. Causa, M. Tovar and B. Alascio
J. Solid State Chem. 156(2) (2001) 458-563
To help the understanding of the physical behavior of Ca1-xYxMnO3, its phase diagram in the whole x concentration range was investigated taking into account the stability of phases and the possible coexistence of different structural phases. By careful analysis of powder X-ray diffraction (XRD) patterns, we were able to observe the following phase diagram: (i) Orthorhombic phases were detected both in the region of 0 < x < 0.25 (O type phase with Ca site twelve fold coordinated) and in the region of 0.5 < x < 0.75 (O′ type phase with Ca site ninefold coordinated). (ii) Phase segregation for 0.25 < x < 0.5 and for x > 0.75 that have not been reported previously, hexagonal YMnO3 segregates as a separate phase for x > 0.75, and for 0.25 < x < 0.5 the coexistence of Ca0.75Y0.25MnO3 (O) and Ca0.5Y0.5MnO3 (O′) have to be included in the refinement for it to converge.
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