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Shi Y.-B.,East China University of Science and Technology | Wu Q.-F.,East China University of Science and Technology | Han Y.,East China University of Science and Technology | Gao W.,East China University of Science and Technology | Gao W.,Shanghai Huaming Gona Rare Earth New Material Co.
Chinese Rare Earths | Year: 2013

The coated CeO2@SiO2 composite abrasive was prepared by chemical precipitation method, using silica powder, cerium nitrate and ammonium bicarbonate as raw materials. Thermo gravimetry-differential sanning calotimetry (TG/DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), energy diffraction spectrum (EDS), infrared (IR) spectra were used to characterize the CeO2@SiO2 composite particle. The slurry prepared with the composite abrasive was used to polish K9 glass. Themorphology differences before and after polishing were investigated with atomic force microscope (AFM), and the RMS values was obtained. The results showed that the CeO2 coated SiO2 particles were successfully prepared, nano-CeO2 was absorbed in the surface of silica powder mainly with Vanderwals force. The surface scratches of the glass were less after polishing, and the RMS was reduced from 54.217 nm to 1.073 nm. Source


Han Y.,East China University of Science and Technology | Shi Y.,East China University of Science and Technology | Ma X.,East China University of Science and Technology | Gao W.,East China University of Science and Technology | Gao W.,Shanghai Huaming Gona Rare Earth New Material Co.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2013

The CZ, CZ/AL, CZ/AS and CZ/AM were prepared by using pseudo-boehmite and aqueous Al(NO3)3·9H2O as the Al2O3 sources with different ways of mixing, and characterized by X-ray diffraction(XRD), brunauer-emmett-teller (BET), oxygen storage capacity(OSC) and TEM analyses. It was showed that the doping of Al2O3 into CZ solid solution could increase the samples' specific surface area, thermal stability and oxygen storage capacity. The CZ, CZ/Al and CZ/AS samples presented single cubic structure, CZ/AS showed the highest specific surface area and CZ/AL had the best oxygen storage capacity. It was also found that the samples of nanometer-level between Al2O3 and (Ce, Zr)O2, would show better thermal stability and higher OSC than those of samples with the micron-level mixing. Source


Cong X.,East China University of Science and Technology | Zhao Y.,Shanghai Huaming Gona Rare Earth New Material Co. | Wu Q.,East China University of Science and Technology | Gao W.,East China University of Science and Technology | Gao W.,Shanghai Huaming Gona Rare Earth New Material Co.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2011

A series of novel red light-emitting phosphors KCaY1-x (MoO4)3:Eux were synthesized by solid-state reaction. The crystal structure, surface morphology and luminescent properties were investigated by powder X-ray diffraction, scanning electron microscope and fluorescence spectrometer, respectively. The result showed that all the phosphors were isostructural, sharing a tetragonal scheelite structure, and could be effectively excited by ultraviolet (394 nm) and blue (465 nm) light, and the main emission line located at 613 nm due to the 5D0 → 7F2 transition of Eu3+. The surface morphology and relative emission intensity of the phosphors could be improved greatly by after-treatment. The wavelengths at 394 and 465 nm were nicely fitting in with the widely applied emission wavelengths of ultraviolet or blue LED chips. So the phosphors were promising candidates for solid-state lighting applications. Source


Zhou Y.,East China University of Science and Technology | Zhao Y.,Shanghai Huaming Gona Rare Earth New Material Co. | Jia J.,Shanghai Huaming Gona Rare Earth New Material Co. | Ma X.,East China University of Science and Technology | And 2 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2014

Ceria-zirconia-alumina composite oxides were prepared by precipitating cerium and zirconium simultaneously on the surface of solid aluminum source (pseudo-boehmite, activated alumina and modified alumina) with cerium nitrate and zirconium nitrate as raw materials, ammonia as precipitant and hydrogen peroxide as oxidant. Samples were made structural characterization and performance analysis by XRD, TEM, BET and H2-TPR. The results showed that the particles became much smaller and the aged performance improved dramatically by loading ceria-zirconia solid solution on the surface of alumina. The ceria-zirconia-alumina composite oxides performed differently with different solid aluminum sources. The sample with pseudo-boehmite as aluminum source showed the largest specific surface area while the sample with modified alumina as aluminum source showed better performance on oxygen storage capacity. Source

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