Malayaite ceramic pigments: A combined optical spectroscopy and neutron/X-ray diffraction study
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Scholar |
Otros documentos de la autoría: Cruciani, Giuseppe; Dondi, Michele; Ardit, Matteo; Lyubenova, Teodora; Carda Castelló, Juan Bautista; Matteucci, Francesco; Costa, Anna Luisa
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http://dx.doi.org/10.1016/j.materresbull.2009.03.006 |
Metadatos
Título
Malayaite ceramic pigments: A combined optical spectroscopy and neutron/X-ray diffraction studyAutoría
Fecha de publicación
2009Editor
ElsevierISSN
255408Cita bibliográfica
Materials Research Bulletin, 44, 8, p. 1778-1785Tipo de documento
info:eu-repo/semantics/articlePalabras clave / Materias
Resumen
Ceramic pigments based on the Cr-doped malayaite structure were synthesized by solid state reaction and characterized by optical spectroscopy and combined X-ray and neutron powder diffraction in order to elucidate the ... [+]
Ceramic pigments based on the Cr-doped malayaite structure were synthesized by solid state reaction and characterized by optical spectroscopy and combined X-ray and neutron powder diffraction in order to elucidate the still unclear chromium substitution mechanisms. The results show that coloration is actually due to simultaneous occurrence of Cr<sup>4+</sup> and Cr<sup>3+</sup> ions in the crystal lattice. Spectroscopy data confirm that Cr<sup>4+</sup> is replacing Sn<sup>4+</sup> in the octahedral site and, in minor amount, Si<sup>4+</sup> in the tetrahedral site. In addition, neutron powder diffraction data suggest that Cr<sup>3+</sup> substitution for octahedral Sn<sup>4+</sup> is charge balanced by the formation of oxygen vacancies with no preference over the different oxygen sites. Upon incorporation of Cr ion, the SnO<sub>6</sub> octahedra exhibit an off-centre displacement of central cation which in turn induces a rearrangement of both the octahedral and tetrahedral coordination shells. © 2009 Elsevier Ltd. All rights reserved. [-]
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