Synthesis and characterisation of perovskite-type oxynitrides
Rooke, J. and Weller, M. (2003) Synthesis and characterisation of perovskite-type oxynitrides. In, Sajgalík, P., Drábik, M. and Varga, S. (eds.) Solid State Chemistry V. Proceedings of the 5th International Conference on Solid State Chemistry, Bratislava, Slovakia, July 7-12, 2002, under the IUPAC Sponsorship. 5th International Conference on Solid State Chemistry, under the IUPAC Sponsorship Zurich, Switzerland, Trans Tech, 417-422. (Solid State Phenomena 91).
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Rare earth and alkaline earth tantalum oxynitride perovskite-type systems of the stoichiometry A((1-x))Ln(x)TaO((2-x))N((1+x)), where A is an-alkaline earth metal (Ca, Sr and Ba) and Ln, a lanthanide, have been synthesised and characterised using powder X-ray and neutron diffraction. The samples formed were orthorhombically distorted perovskites and crystallised in the space group Pnma. Further analysis of the diffraction data has highlighted the influences that the nature of the cations incorporated and the distribution of the anions have on crystal structure and lattice size. Thermogravimetric analyses have been performed in air and show the onset of decomposition at ca. 400degreesC for all materials. UV-Vis spectroscopic measurements show that these compounds exhibit absorption bands in the visible region, due to inter-band transitions, with positions that can be correlated with structure and composition.
|Item Type:||Book Section|
|Keywords:||ammonolysis, powder diffraction, oxynitrides, perovskites, ray-powder diffraction, pigments, neutron|
|Subjects:||Q Science > QD Chemistry|
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||23 Feb 2006|
|Last Modified:||02 Mar 2012 12:45|
|Contributors:||Rooke, J. (Author)
Weller, M. (Author)
Sajgalík, P. (Editor)
Drábik, M. (Editor)
Varga, S. (Editor)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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