Abstract: Genesis of the structure of zirconia fine particles prepared by precipitation of amorphous hydrated zirconia by ammonia from the ZrO(NO 3)2 solution followed by a mild hydrothermal treatment (HTT) of precipitate, washing and calcination under air up to 1000°C has been studied by HRTEM, X-ray diffraction, Raman and FTIRS. HTT rearranges the structure of amorphous zirconia, which helps to obtain nearly single-phase monoclinic nanozirconia (particle size 5-15 nm) after a mild calcination at 500°C. Dehydroxilation and sintering of these nanoparticles at higher (600-650°C) temperatures generate polysynthetic (001) twins. Modeling revealed that reappearance of the (111) "cubic" reflex in XRD patterns of samples calcined at 600-650°C can be due to these extended defects. In their vicinity, the seven-fold Zr-O coordination sphere is retained, while packing of ZrO7 polyhedra is varied towards more symmetric structures, thus causing disappearance of the Raman spectra. © 2005 Materials Research Society.

Cite: Sadykov V.A. , Zaikovskii V.I. , Zyuzin D.A. , Moroz E.M. , Burgina E.B. , Ishchenko A.V. , Kostrovskii V.G. , Matyshak V.A.
Nanoscale Structural Features of Ultra-Fine Zirconia Powders Obtained via Precipitation-Hydrothermal Treatment Route
In compilation Solvothermal Synthesis and Processing of Materials : Symposium Y at the 2005 MRS Spring Meeting, 28 March - 1 April 2005, San Francisco, California, USA : Proceedings. – Cambridge University Press, Materials Research Society., 2005. – C.99-104. – ISBN 9781558998322. Scopus РИНЦ AN

Identifiers:

Scopus:	2-s2.0-34249991714
Elibrary:	15042309
Chemical Abstracts:	2008:100295

Citing:

DB	Citing
Scopus	13
Elibrary	7