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Zhou J.,Sun Yat Sen University | Zhong J.,Sun Yat Sen University | Dai J.,Sun Yat Sen University | Xiao Z.,Sun Yat Sen University | And 4 more authors.
Science of Advanced Materials | Year: 2017

To investigate glasses with good luminescence and fast scintillation properties, Ce3+ doped phosphate scintillator glasses 17Na2O+66P2O5 +17(1-x)Gd2O3 +xCe2O3 (NPG: Ce3+) were prepared using melt quenching method under CO reducing atmosphere. XRD patterns, absorption and photoluminescence spectra, lifetime, FTIR spectra and X-ray excited luminescence spectra of the obtained phosphate glasses were determined, respectively. The XRD patterns showed that the glass system was properly formed. The characteristic peaks of Ce3+ and Gd3+ were observed in the absorption and photoluminescence spectra. The luminescence emission due to 5d →4f transition of Ce3+ is sensitized by the Gd3+ ions in the glass host and significant red shift was observed in the UV-vis and X-ray excited luminescence spectra. The decay curves of Ce3+ emission were fitted with very short lifetimes of less than 30 ns. The good luminescence properties of the Ce3+ doped phosphate glasses under X-ray excitation and the short lifetime imply that this material has potential application as scintillator material. © 2017 by American Scientific Publishers All rights reserved.


Chen W.,Nanchang University | Tong Y.,North China University of Water Conservancy and Electric Power | Liu Y.,Nanchang University | Liu M.,Nanchang University | And 4 more authors.
Ceramics International | Year: 2013

Y2O3:Eu3+ nanophosphors were fabricated by direct thermal decomposition of monohydrate yttrium europium propionates, which can be facilely obtained via cocrystallization. The composition and structure of the cocrystallized product were confirmed by X-ray diffractionmetry (XRD), simultaneous differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) as well as inductively coupled plasma mass (ICP-MS) spectrometry. The effects of decomposition temperature on the resultant microstructures such as crystallinity, particle size and particle dispersibility were investigated by XRD and transmission electron microscopy (TEM). The dependence of their luminescent properties on decomposition temperature was also studied by fluorescence spectrophotometry. The results showed that the microstructures and luminescent intensities of Y2O3:Eu3+ nanophosphors could be tuned by varying calcination temperatures of cocrystallized yttrium europium propionates from 600 to 1000 °C. © 2012 Elsevier Ltd and Techna Group S.r.l.


Han Q.,Kunming University of Science and Technology | Han Q.,CAS Shanghai Institute of Ceramics | Liu G.,Ganzhou Qiandong Rare Earth Group Co. | Peng N.,Ganzhou Qiandong Rare Earth Group Co. | And 3 more authors.
Key Engineering Materials | Year: 2012

Electrode slurry made of Pt powder was brushed on both surfaces of the sintered ZrO2 substrate. And then the Pt electrodes were sintered under various temperatures. The microstructure of the surface of the electrodes was characterized by scanning electronic microscope. The electrochemical properties of the electrodes were investigated by electrochemical impedance spectroscopy (EIS). The results show that the sintered temperature of the electrode has a remarkable effect on the microstructure of the electrode and the Pt electrode show favorable electrochemical catalysis performance. © (2013) Trans Tech Publications.


Liu Y.,Sun Yat Sen University | Wang Z.,Sun Yat Sen University | Zhong J.,Sun Yat Sen University | Pan F.,Sun Yat Sen University | And 3 more authors.
Materials Letters | Year: 2014

Red-emitting phosphors Ba2Gd8(SiO4) 6O2:Eu3+ (BGS:Eu3+) with silicate apatite structure were prepared by the conventional high temperature solid state reaction method. Rietveld structural refinement based on X-ray diffraction data indicated that there are two different sites for Eu3+ occupying in the host. It was found that the phosphors BGS:Eu3+ exhibit red emission with high quenching concentration at ~70.75 at%, then the critical transfer distance of Eu3+ in BGS:Eu3+ was calculated to be ~12.3 Å. More importantly, it has better CIE chromaticity coordinate for white light-emitting diode (w-LED) application in comparison with the commercial phosphor (Y,Gd)BO3:Eu3+ (YGB:Eu3+) under near ultraviolet (n-UV) 393 nm excitation. © 2014 Elsevier B.V.


Liu W.,Shanghai Normal University | Liu W.,CAS Shanghai Institute of Ceramics | Liu G.,Ganzhou Qiandong Rare Earth Group Co. | Peng N.,Ganzhou Qiandong Rare Earth Group Co. | Sun D.,Shanghai Normal University
Key Engineering Materials | Year: 2012

Currently, Yttria-stabilized zirconia solid state electrolyte are widely used in various fields. The basic performance of Yttria-stabilized zirconia (5YSZ) prepared by different synthesis methods and sintering temperatures are studied in this paper, their phase compositions and microstructure are studied with XRD and SEM. The ionic conductivity of 5YSZ sintered at different temperatures are studied with A.C. impedance spectroscopy measurement. © (2013) Trans Tech Publications.


Chen X.,Key Laboratory of Molecular Biology and Genetic Engineering of Jiangxi Provice | Chen X.,Nanchang University | Cai Q.-Y.,Key Laboratory of Molecular Biology and Genetic Engineering of Jiangxi Provice | Yu X.-S.,Key Laboratory of Molecular Biology and Genetic Engineering of Jiangxi Provice | And 6 more authors.
Chinese Rare Earths | Year: 2015

The vertical distributions of soil environmental factors were compared in ion-type rare earth mines before and after in-situ leaching, and the primary limiting factors effecting ecological reconstruction were explored in rare earth mines of South Jiangxi. Test results show that, after in-situ leaching, ash-free dry mass (AFDM), total organic carbon, ammonia-cal nitrogen, nitrate nitrogen and total nitrogen in soil increased significantly; pH value, microbial biomass carbon and total phosphorus decreased significantly; significant differences of soil environmental factors were found among horizons. The results of principal components analysis inticated that, before treatment, the dominant soil environmental factor in the topsoil is MBC, and that in other horizons (1~6 m) is pH value; the dominant factor in the topsoil changed to be TOC, and that in the weathered soil (3~6 m) became soil moisture (SM) and TN. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved.


Wang H.Q.,Tongji University | Wang H.Q.,CAS Shanghai Institute of Ceramics | Liu G.M.,Ganzhou Qiandong Rare Earth Group Co. | Peng N.S.,Ganzhou Qiandong Rare Earth Group Co. | And 4 more authors.
Key Engineering Materials | Year: 2012

With the growing problem of automobile exhaust pollution, the study of automotive oxygen sensor is very meaningful, nitrogen oxides accounts for a large proportion of automobile exhaust. AC impedance spectroscopy of the NOx sensor in different temperature (773K, 873K, 973K) and NO2 of different concentrations (100ppm, 500ppm, 1000ppm) in this paper, the influence of temperature and gas concentration on NOx sensors is explored. © (2013) Trans Tech Publications.


Huan C.,East China Normal University | Huan C.,CAS Shanghai Institute of Ceramics | Jiang D.,CAS Shanghai Institute of Ceramics | Liu G.,Ganzhou Qiandong Rare Earth Group Co. | Li Q.,East China Normal University
Key Engineering Materials | Year: 2012

There are many bonding methods of the ceramic sintered body, such as diffusion bonding, glass bonding, and reports in this regard are not difficult to see. But the solid electrolyte zirconia ceramic bonding in NOx sensor is rarely reported. Here we use zirconia and aluminum-silicon glass together to bond zirconia ceramic sintered body, and tested the electrochemical performance with AC (alternating current) impedance spectroscopy, EMF (electromotive force) of the adhesive layer. The results indicate that the electrochemical performance is good. © (2013) Trans Tech Publications.


Cui J.,East China Normal University | Cui J.,CAS Shanghai Institute of Ceramics | Feng T.,CAS Shanghai Institute of Ceramics | Xia J.,CAS Shanghai Institute of Ceramics | And 3 more authors.
Key Engineering Materials | Year: 2012

Through Mechanical grounding method, CaZrO3 - 8YSZ(8% in mol yttria stabilized zirconia) electrolyte samples with different amounts of CaZrO3 at 10wt%, 20wt%, 30wt% were sintered at different temperatures in furnace. So composite stabilized ZrO2 is composed. The effects of the sintering temperature and the contents of the CaZrO3 on the conductivity, porosity, flexure strength, hardness were investigated. XRD and SEM were used to analyse the compositions and microcosmic morphology. © (2013) Trans Tech Publications.

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