Low-agglomerated yttria nanopowders via decomposition of sulfate-doped precursor with transient morphology

The fabrication peculiarities of low-agglomerated yttria (Y2O3) nanopowders via thermal decomposition of sulfate-doped precursor with transient morphology were studied. It was determined that Y2(OH)5(NO3)x(CO2)y(SO4)z·nH2O (n=1-2) crystalline precursor underwent fragmentation and decomposition into...

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Bibliographic Details
Published in:Journal of rare earths 2014-04, Vol.32 (4), p.320-325
Main Authors: Yavetskiy, R.P., Kosyanov, D.Yu, Baumer, V.N., Doroshenko, A.G., Fedorov, A.I., Matveevskaya, N.A., Tolmachev, A.V., Vovk, O.M.
Format: Article
Language:English
Subjects:
Agglomeration
Decomposition
Morphology
nanopowders
Nanostructure
particle size
precursor
Precursors
Rare earth metals
rare earths
sinterability
Spheroidizing
sulfate-ions
transient morphology
yttria
Yttrium oxide
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Summary:The fabrication peculiarities of low-agglomerated yttria (Y2O3) nanopowders via thermal decomposition of sulfate-doped precursor with transient morphology were studied. It was determined that Y2(OH)5(NO3)x(CO2)y(SO4)z·nH2O (n=1-2) crystalline precursor underwent fragmentation and decomposition into isolated quasi-spherical Y2O3 particles upon calcination. Effect was connected with minimizing the free energy of the plate-like crystallites via reducing the contact surface until to the moment of spheroidization and attainment of isolation that occurred at T=1100 °C. Residual sulfate ions slowed down the surface diffusion during heat treatment thus retaining quasy-spherical morphology and low aggregation degree of Y2O3 nanopowders. Sulfate-doped yttria nanopowders with medium particle size of 53±13 nm possessed improved sinterability in comparison with undoped ones arising from finer particle size, narrower particle distribution and lower agglomeration degree. The micrographs of Y2(OH)5(NO3)x(CO2)y(SO4)z·nH2O precursor with transient morphology (a) and low-agglomerated Y2O3 nanopowders calcined at T=1100°C (b)
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60074-0