Fabrication of neodymiumdoped yttrium aluminum garnet (Nd:YAG ) nanopowders and transparent ceramics by a supercritical fluid drying technique
XIE HuiCai;YANG Ru;QIN Jie;LI Min
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State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Neodymium doped yttrium aluminum garnet (Nd:YAG) precursor precipitates doped with different amounts of Nd have been synthesized via the urea homogeneous precipitation method using Y2O3、OAl(NO3)3·9H2O and Nd(NO3)3·6H2O as raw materials. The fresh wet precipitates were dried by supercritical CO2 and then calcined at 1300℃ for 3h, affording Nd:YAG nanopowders. After uniaxially pressing into pellets followed by isostatic cold pressing, the resulting biscuits were sintered between 1780-1800℃ under vacuum giving transparent ceramics with excellent properties. The calcined powders were characterized by infrared (IR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy. The transmittance of the transparent ceramics was measured using an ultravioletvisiblenear infrared spectrophotometer, and their surface topography was observed using a scanning electron microscope (SEM). The results showed that the precursor was directly converted to pure YAG after calcination at 1300℃ and that the particles were ellipsoidal with excellent dispersion and uniform size distribution. Transparent ceramics could obtained by sintering of the powders between 1780-1800℃ with 1% molar fraction of Nd, and the grain size distribution of the ceramic samples was 5-10μm, and the transmittance of double-polished samples with a thickness of 4mm was above 80% at a wavelength of 1064nm.
XIE HuiCai;YANG Ru;QIN Jie;LI Min.
Fabrication of neodymiumdoped yttrium aluminum garnet (Nd:YAG ) nanopowders and transparent ceramics by a supercritical fluid drying technique[J]. Journal of Beijing University of Chemical Technology, 2013, 40(6): 56-61
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