Research Institute of Synthetic Crystals

Beijing, China

Research Institute of Synthetic Crystals

Beijing, China

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Zheng Y.-J.,Mudanjiang Normal University | Wang L.-J.,Mudanjiang Normal University | Wang F.-B.,Mudanjiang Normal University | Zuo G.-H.,Mudanjiang Normal University | Zhou Z.-X.,Research Institute of Synthetic Crystals
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2016

Using Al2(SiO3)3 and Na2SiO3·9H2O as raw materials, jadeite were successfully achieved from its glass phase under high pressure and high temperature (HPHT) by simulating the mineralization principle of natural jadeite. The synthetic jadeite samples exhibit highly saturated colors and smooth finish with a greasy feel and luster that are features of high quality jadeite. X-ray diffraction and scanning electron micrographs results show that the jadeite samples were all well-crystallize, exhibiting a good texture with vitreous luster and appearance exactly like that of natural jadeite. The result shows that temperature have great influence on the grain growth and weaving conditions of synthetic jadeite under the condition of 4.0-5.5 GPa. The infrared characteristic peaks are consistent with natural jadeite by FTIR test. It was shown that the synthetic jadeites have the molecular structure of silicon oxygen tetrahedron structure. © 2016, Chinese Ceramic Society. All right reserved.


Liu C.-H.,Southwest University of Science and Technology | Zhong L.,Southwest University of Science and Technology | Lei Y.-M.,Research Institute of Synthetic Crystals | Hou L.,Sichuan University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Adding KReO4 to electroless, a smooth and compact Ni-P-Re alloy coating were obtained. The products were characterized by SEM, XRD and EDS. The results show that coating is an amorphous structure. But because of Re element's adding, it delayed the conversion time from amorphous structure to crystalline structure until 600 ℃. The coating oxidation weight increase is decreased obviously, the fretting friction coefficient of Ni-Re-P is inferior to Ni-P coating's. It shows excellent ablitity of anti-oxidation and anti-wear and tear, it is in favour of keeping excellent mechanical property under high temperature environment.


Li F.-H.,Tsinghua University | Li F.-H.,Research Institute of Synthetic Crystals | Li J.-B.,Tsinghua University | Lin H.,Tsinghua University | And 3 more authors.
Key Engineering Materials | Year: 2010

The present paper summarizes the technology and basic process for fabricating transparent ceramic MgAl2O4 spinel and introduces a scalable production technique. Fully transparent polycrystalline spinel has been prepared by combined vacuum sintering, hot-pressing, sintering in H2 atmosphere and hot isostatic pressing(HIP). The optical transmittance of the specimen sintered at 1500 following HIP at 1800 was nearly the same as that of single crystal spinel. When radiated by γ-ray and X-ray, colorless spinel became brown due to V-type color centers, which decreased its transmittance. On the other hand, the spinel ceramics' resistance to radiation improved by doping CeO2. © (2010) Trans Tech Publications.


Cui H.,CAS Institute of Process Engineering | Cui H.,Research Institute of Synthetic Crystals | Wu X.,CAS Institute of Process Engineering | Chen Y.,CAS Institute of Process Engineering | Boughton R.I.,Bowling Green State University
Materials Research Bulletin | Year: 2014

Mesoporous MgO particles have been synthesized through a novel template-free hydrothermal co-precipitation method using a Mg(NO 3)2 solution as the magnesium source and NaCO3 as precipitant. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2 adsorption-desorption analysis. The results indicate that the MgO samples have a disordered mesoporous structure, a large BET surface area, and a large pore volume. The effect of reaction temperature on the MgO product BET surface area was studied. A possible formation and crystal growth mechanism for mesoporous MgO is proposed. © 2013 Elsevier Ltd. All rights reserved.


Cui H.,CAS Institute of Process Engineering | Cui H.,Research Institute of Synthetic Crystals | Wu X.,CAS Institute of Process Engineering | Chen Y.,CAS Institute of Process Engineering | And 2 more authors.
Materials Research Bulletin | Year: 2015

Pure MgO and Cu-doped MgO nanopowders was obtained by a chemical co-precipitation process. The influence of copper doping on the crystal structure and particle morphology of MgO is discussed. The XPS results indicate that the Cu ion has been successfully incorporated into the MgO lattice. Adsorption tests show that the pseudo-second-order fitting equation is better for describing the adsorption kinetics of chlorine on MgO nanoparticles. The antibacterial properties of MgO nanopowders were investigated, as well as the influence of storage time on the adsorption and the antibacterial properties. © 2014 Elsevier Ltd. All rights reserved.


Yan H.,Zhengzhou Railway Vocational and Technical College | Chen B.,Zhengzhou Railway Vocational and Technical College | Huang C.-X.,Research Institute of Synthetic Crystals
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

Fully transparent polycrystalline spinel has been prepared by combined vacuum sinteringcombined with hot-pressing and hot isostatic pressing using high purity, ultrafine spinel powder. The effects of sintering processing on microstructure and density of transparent polycrystalline spinel were studied. The results indicated that the density of spinel increased as the sintering temperature and sintering time increasing, higher sintering temperatures lead to a substantial grain.


Zhu X.-H.,South China Normal University | Fan G.-H.,South China Normal University | Wang H.-L.,Research Institute of Synthetic Crystals | Sheng D.-Z.,Research Institute of Synthetic Crystals | Zhang Y.,South China Normal University
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2010

A novel Ce:YAG ceramic phosphor was prepared by vacuum sintering technique. The ceramic phosphor was characterized by the X-ray diffraction, photoluminescence excitiation spectra and photoluminescence spectra. It has been showed that the ceramic phosphor a main Y 3Al 5O 12 phase, and the yellow emission, around 550 nm in wavelength, was observed from the ceramic phosphor under the excitement of 470 nm. A white LED which packaged by this Ce:YAG ceramic phosphor with a 470 nm-emitting blue chip showed only 10% degradation of relative intensity of luminous efficacy and no change of the color coordinate after high temperature aging at 110°C for 600 hours, which showed better performance in stability and lifetime than packaged by traditional ways at the same condition. The results indicated that the ceramic phosphor is a very suitable material for power white LED packaging.


Wang H.-L.,Research Institute of Synthetic Crystals | Pu R.-M.,Research Institute of Synthetic Crystals | Wang Z.,Research Institute of Synthetic Crystals | Shen D.-Z.,Research Institute of Synthetic Crystals
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

Yb:YAG superfine powder doped with 5.0at% Yb3+was synthesized by sol-gel method. Using this powder, Yb:YAG transparent ceramic with size of φ10 mm×2 mm was successfully fabricated by vacuum hot pressing and hot isostatic pressing technique. Phase composition of the synthesized powder, microstructure and optical transmittance of this Yb:YAG transparent ceramic were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and UV/VIS/NIR spectrometer. XRD result shows that precursor transforms to pure YAG phase by calcining at 1000°C for 2 h. Using Scherrer equation, the crystal size is calculated to be 38 nm. Fracture SEM result shows that average grain size of the transparent ceramic is about 10μm. Optical transmittance of the Yb:YAG transparent ceramic sample with thickness of 2 mm reaches 81% at the wavelength of 1100 nm, and the main absorption peak is centered at 938 nm.


Shen D.-Z.,Research Institute of Synthetic Crystals | Zhang S.-F.,Research Institute of Synthetic Crystals | Chen J.-R.,Research Institute of Synthetic Crystals | Wang H.-L.,Research Institute of Synthetic Crystals
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

This paper reviews the recent progress of synthetic crystal since new century in the following fields: growth of large size crystal, explore the new crystals, THz wave, period microstructure, nanotechnology, LED substrate and wide band gap semiconductor, photonic crystal. The future development of synthetic crystal is also previewed.


Li Y.-F.,Research Institute of Synthetic Crystals | Guo Z.-M.,Research Institute of Synthetic Crystals
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

In this paper, the subjects, authors, quantity and citations of the published articles in Journal of Synthetic Crystals during 2002-2012 were statistically analyzed, and the main achievements in the field of synthetic crystals were reported. In these ten years, there were altogether 2643 papers with authors scattered in 211 or 985 project universities and CAS institutes and some of the articles are supported by research funds. This paper also demonstrated the characteristics of Journal of Synthetic Crystals in the hope of promoting academic exchange in the field of synthetic crystals and technological innovation in the field of synthetic crystals.

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