Low-agglomerated yttria nanopowders via decomposition of sulfate-doped precursor with transient morphology
来源期刊：JOURNAL OF RARE EARTHS2014年第4期
论文作者：R.P.Yavetskiy D.Yu.Kosyanov V.N.Baumer A.G.Doroshenko A.I.Fedorov N.A.Matveevskaya A.V.Tolmachev O.M.Vovk
文章页码：320 - 325
摘 要：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 Т=1100 °С.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.
R.P.Yavetskiy1，D.Yu.Kosyanov1，V.N.Baumer2，A.G.Doroshenko1，A.I.Fedorov2，N.A.Matveevskaya1，A.V.Tolmachev1，O.M.Vovk1
1. Institute for Single Crystals of NAS of Ukraine2. State Scientific Institution“Institute for Single Crystals”of NAS of Ukraine
摘 要：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 Т=1100 °С.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.
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