Yttrium oxide nanoparticles preparation
|Tasoltan T. Basiev , Vasilii A. Konyushkin , Pavel Fedorov , Sergey V. Kuznetsov , Sergei V. Lavristchev , Vjatcheslav V. Osiko , Alexey M. Samartzev , Valerii V. Voronov|
General Physics Institute, Vavilov Str. 38, Moscow 117942, Russian Federation
Yttrium oxide crystallized in cubic system and characterized by high thermoconductivity and transparence in the IR-range. Y2O3 nanoparticles are precursors for laser ceramic fabrication.
Nanoparticles of yttrium oxide formation were investigated using soft chemistry methods, i.e. yttrium oxide dissolution in acids (nitric, hydrochloric) followed by pH-regulation by the ammonium solution titration or by the urea hydrolysis under heating. The obtained gel-like precipitations of the precursors lost their volatile components during drying and heating. The follows chemical reactions took place in the nitrate processes:
Y2OH)5NO3×nH2O --- Y2(OH)5NO3 + nH2O (n=2-3),
Y2(OH)5NO3 --- Y4O5(NO3)2 +5H2O,
Y4O5(NO3)2 --- 2Y2O3 + 2NO+1.5O2,
at the first step finished at 150 oC, the second – at 340 oC and the third – at 500-550 oC.
The coherent dispersion scattering regions sizes of Y2O3 particles are 30-40, 56-72 and 90-130 nm after thermal treatment at 500, 750, 900 oC respectively and are the function of first deposition conditions (composition and solutions electronic microscopy data provides the strong multilevel agglomeration particles formation. Y2O3 particles form follows the precursors particles form. The addition of the surface active compounds to the initial solution allows changing the deposited particles form.
The ultra-sonic effect (frequency 22 kHz, power 100 W) during precursor precipitation in the cavitations zone leads to plates formation (size 1×1 μm and thickness approximately 20 nm). Without surface active compounds the plates grow into the agglomerates with the linear size approximately 1 μm. Thermal treatment of precursors allows fabrication quasi 2D particles of cubic yttrium oxide.
The conditions of globular 13-130 nm Y2O3 nanoparticles fabrication were determinated.
Presentation: poster at E-MRS Fall Meeting 2005, Laser Ceramic Symposium, by Vasilii A. Konyushkin
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-06-15 10:14 Revised: 2009-06-07 00:44