Person:
Torralvo Fernández, María Josefa

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First Name
María Josefa
Last Name
Torralvo Fernández
URI
https://hdl.handle.net/20.500.14352/76321
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Inorgánica
Area
Química Inorgánica
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Author: Gonzalvo, Borja × Has files: true ×

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    (Bi,R)2O3 (R: Nd, Sm and Dy) oxides as potential pigments
    (Journal of Alloys and Compounds, 2001) Gonzalvo, Borja; Romero de Paz, Julio; Fernández, Francisco; Torralvo Fernández, María Josefa
    In this work we have tackled the feasibility of the colored oxides in the Bi2O3 –R2O3 system as ecological inorganic pigments.We have prepared by solid state reaction the mixed oxides (Bi2O3)1-x(R2O3)x , R: Nd, Sm and Dy, with nominal compositions: Nd, x=0.2 and 0.5; Sm, x=0.4; and Dy, x=0.35. The obtained orange (Bi2O3)0.6 (Sm2O3)0.4 and (Bi2O3)0.65(Dy2O3)0.35 oxides present f.c.c. fluorite-type structure. (Bi2O3)0.8(Nd2O3)0.2 oxide consists of a mixture of two phases which present f.c.c. d-Bi2O3 and Bi–Sr–O-type structures in the 900–1200 ºC temperature range. In the synthesis of the oxide with nominal composition (Bi2O3)0.5(Nd2O3)0.5 we have obtained a greenish sample with higher neodymium content. This sample presents the Bi3R5O12-type structure. Diffuse reflectance data and color coordinates suggest that the (Bi2O3)0.6(Sm2O3)0.4 and (Bi2O3)0.65(Dy2O3)0.35 oxides are expected to be promising candidates as new ecological pigments.