Crystal structural and optical properties of Y2(Ti,Cr)2O7 and Y2(Sn,Cr)2O7 pyrochlores (Articolo in rivista)

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  • Crystal structural and optical properties of Y2(Ti,Cr)2O7 and Y2(Sn,Cr)2O7 pyrochlores (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.actamat.2006.11.008 (literal)
Alternative label
  • Matteucci F.; Cruciani G.; Dondi M.; Baldi G.; Barzanti A. (2007)
    Crystal structural and optical properties of Y2(Ti,Cr)2O7 and Y2(Sn,Cr)2O7 pyrochlores
    in Acta materialia
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Matteucci F.; Cruciani G.; Dondi M.; Baldi G.; Barzanti A. (literal)
Pagina inizio
  • 2229 (literal)
Pagina fine
  • 2238 (literal)
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  • http://www.sciencedirect.com/science/article/pii/S1359645406008160 (literal)
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  • 55 (literal)
Rivista
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  • 10 (literal)
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  • 7 (literal)
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  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ISTEC-CNR, Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018 Faenza, Italy Department of Earth Sciences, University of Ferrara, Via Saragat 1, 44100 Ferrara, Italy CE.RI.COL., Colorobbia Italia SpA, Via Pietramarina 123, 50053 Vinci, Italy (literal)
Titolo
  • Crystal structural and optical properties of Y2(Ti,Cr)2O7 and Y2(Sn,Cr)2O7 pyrochlores (literal)
Abstract
  • Pyrochlore-type [AVIII(2)BVI(2)O6O] rare earth stannates (PS) and titanates (PT), doped with increasing amounts of Cr, develop colours ranging from magenta to brown. Combined X-ray and neutron diffraction data revealed that Cr solubility in both pyrochlores is very limited, i.e. 0.07 atoms/formula unit in PS and 0.06 atoms/formula unit in PT. A further increase in the Cr amount determines the formation of the YCrO3 perovskite. Diffuse reflectance spectroscopy data showed that the optical properties of Cr-doped yttrium titanates and stannates are rather similar, and that the final colour of the powders is due to the overlapping peaks of Cr4+ in the octahedral site of the pyrochlore and of Cr3+ in the ternary perovskite. The oxygen occupancy refinement showed that no anion vacancies are formed upon Cr substitution for Sn4+ or Ti4+, implying that such a charge compensation mechanism does not occur, confirming that the Cr in titanate and stannate pyrochlores is mainly in a tetravalent state. (literal)
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