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Journal of Rare Earths 2024年第9期42卷 1747-1754,I0004页

作者： Wei Li tongxiang liang Xiang He Vyunov Oleg Dongfang Pang Shan Wu College of Rare Earths Jiangxi University of Science and TechnologyGanzhou341000China Key Laboratory of High Performance Ceramics and Ultrastructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai201800China

Lead-free ferroelectric ceramics,0.67Bi_(1-x)Eu_(x)FeO_(3)-0.33BaTiO_(3)(BF-BT-xEu,x=0-0.02),were prepared via a solid-state reaction,The effect of Eu^(3+) doping on the microstructure,dielectric properties,ferroelectric properties,and electric-field-induced strain was *** X-ray diffraction(XRD) results indicate the presence of a mixed phase of tetragonal and rhombohedral at the morphotropic phase boundary(MPB).Doping with an appropriate amount of Eu^(3+) reduces the Fe^(3+) content and decreases the leakage current in the binary system.A converse piezoelectric coefficient(d_(33)*) of 392 pm/V is obtained at BF-BT-0.003Eu under an electric field of 60 kV/cm at room temperature,which has a Curie temperature(T_(C)) of 414℃,The unipolar strain and d_(33)* of BF-BT-0.003Eu ceramics increase to 0.438%and 730 pm/V at 125℃ The field-induced strain response of the BF-BT-0.003Eu ceramics is greater than that of 0.67BF-0.33BT,mainly due to its optimal grain size,reduction of leakage current,and coexistence of ferroelectric-relaxation phases,BF-BT-0.003Eu ceramic is a lead-free candidate for high-temperature actuator applications.

关键词： Ferroelectric Field-induced strain Ceramics Lead-free Rare earths

A review of TRISO-coated particle nuclear fuel performance models

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Rare Metals 2006年第Z1期25卷 337-342页

作者： LIU Bing liang tongxiang TANG Chunhe Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

The success of high temperature gas cooled reactor depends upon the safety and quality of the coated particle fuel. The understanding and evaluation of this fuel requires the development of an integrated mechanistic fuel performance model that fully describes the mechanical and physicochemical behavior of the fuel particle under irradiation. In this paper, a review of the analytical capability of some of the existing computer codes for coated particle fuel was performed. These existing models and codes include FZJ model, JAERI model, Stress3 model, ATLAS model, PARFUME model and TIMCOAT model. The theoretic model, methodology, calculation parameters and benchmark of these codes were classified. Based on the failure mechanism of coated particle, the advantage and limits of the models were compared and discussed. The calculated results of the coated particles for China HTR-10 by using some existing code are shown. Finally, problems and challenges in fuel performance modeling were listed.

关键词： high temperature gas cooled reactor coated fuel particle model

Ceramics for high level radioactive waste solidification

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Journal of Advanced Ceramics 2012年第3期1卷 194-203页

作者： Li WANG tongxiang liang Institute of Nuclear&New Energy Technology Beijing Key Lab of Fine CeramicsTsinghua UniversityBeijing 100084China State Key Lab of New Ceramic and Fine Processing Tsinghua UniversityBeijing 100084China

Several countries reprocess their nuclear spent fuel using the Purex process to recover U and Pu as MOX *** high level radioactive waste(HLW)produced during this reprocessing is a complex mixture containing both radioactive(fission products,minor actinides)and non-radioactive *** HLW shows high rate heat release and contains some long half-life and biologically toxic radionuclide,its treatment and disposal technology is complex,difficult and high *** treatment and disposal become a worldwide challenge and research *** order to minimize the potential long-term impact of HLW,studies on enhanced chemical separation processes of long-lived radionuclides are in *** options are then envisaged for these separated radionuclides:(a)transmutation into short-lived or non-radioactive elements,(b)immobilization in highly durable ceramic matrix instead of borosilicate *** this paper,we briefly review the composition,structure,processing and product properties of some ceramic candidates for inert matrix fuels(IMF)and the immobilization of high level radioactive waste.

关键词： nuclear spent fuel ceramic immobilization transmutation high level radioactive waste

Effect of particle size on phase structure of ZrO_2 produced by hydrolysis of ZrOCl_2 solution

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Journal of University of Science and Technology Beijing 2005年第4期12卷 365-369页

作者： Tianyong Luo tongxiang liang Chensha Li Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China

A method to produce ZrO2 nano-particles is developed and the effect of particle size on the phase structure of ZrO2 is studied. The method is based on the hydrolysis of ZrOCl2 solution in the reverse micelles of a liquid-liquid two-phase system, in which AOT （sodium 2-ethylhexyl sulfosuccinite） and toluene are chosen as the surfactant and organic phase, respectively. The reverse micelles prevent the aggregation of primary particles, the nano-particle size increases as the AOT content decreases. The TEM, XRD and particle-size analysis results show that the occurrence of metastable tetragonal ZrO2 is attributed to the effect of the particle size other than the effect of the crystallite size. The ratio of t-phase to m-phase increases as the particle size decreases, and 28 nm is the critical size for t-phase to m-phase transformation.

关键词： zirconia nano-particles hydrolysis phase transformation

Preparation of microsized crosslinked microspheres by dispersion copolymerization of polystyrene/polyethylene glycol 200-dimethacrylae

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Journal of University of Science and Technology Beijing 2006年第4期13卷 380-384页

作者： Wenli Guo Juan Wang tongxiang liang Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China

Dispersion copolymerization of styrene with polyethylene glycol 200-dimethacrylae as the cross-linking agent was completed by using poly（N-vinyl pyrrolidone） and 2,2-azo-bisisobutyronitrile as the steric stabilizer and initiator, respectively. Crosslinked copolymeric microspheres were prepared directly by the one-step method of dispersion copolymerization. The effects of the content of polyethylene glycol 200-dimethacrylae on the particle morphology and the copolymerization rate were investigated. It shows that the crosslinking agent plays an important role in the particle morphology and the system stability. When the content of crosslinking reached 2.5wt%, the floriated particles were obtained.

关键词： polystyrene microsphere dispersion polymerization crosslinking agent

Preparation of ZrO_2 nano-particles by the hydrolysis of ZrOCl_2 solution in the reverse micelles

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Journal of University of Science and Technology Beijing 2006年第4期13卷 355-358页

作者： Chensha Li tongxiang liang Tianyong Luo New Material Division Institute of Nuclear Energy Technology Tsinghua University Beijing 102201 China

Zirconia nano-particles have been produced by the hydrolysis of ZrOCl2 solution in the reverse micelles of a liquid-liquid two-phase system, in which sodium bis（2-ethylhexyl） sulfosuccinite （AOT） and toluene were chosen as the surfactant and organic phase, respectively. The reverse micelles prevented the aggregation of primary particles and reduced the diameters of zirconia nanoparticles. Superfine zirconia powders soft-aggregated by the zirconia nano-particles were obtained. The diameters of zirconia nanoparticles were influenced by the quantity of the surfactant.

关键词： zirconia nanoparticles hydrolysis surfactant

Research on graphite powders used for HTR-PM fuel elements

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Rare Metals 2006年第Z1期25卷 347-350页

作者： ZHAO Hongsheng liang tongxiang ZHANG Jie LI Ziqiang TANG Chunhe Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Different batches of natural graphite powders and electrographite powders were characterized by impurity, degree of graphitization, particle size distribution, specific surface area, and shape characteristics. The graphite balls consist of proper mix-ratio of natural graphite, electrographite and phenolic resin were manufactured and characterized by thermal conductivity, anisotropy of thermal expansion, crush strength, and drop strength. Results show that some types of graphite powders possess very high purity, degree of graphitization, and sound size distribution and apparent density, which can serve for matrix graphite of HTR-PM. The graphite balls manufactured with reasonable mix-ratio of graphite powders and process method show very good properties. It is indicated that the properties of graphite balls can meet the design criterion of HTR-PM. We can provide a powerful candidate material for the future manufacture of HTR-PM fuel elements.

关键词： high temperature gas-cooled reactor graphite powder design criterion

A study of function mechanism of hemxamethyl tetra-amine in gelation process of uranium

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Rare Metals 2006年第Z1期25卷 343-346页

作者： GUO Wenli liang tongxiang ZHAO Xingyu HAO Shaochang FU Xiaoming Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

The UO2 ceramic microspheres are the most important materials in the spherical fuel elements for high temperature reactor (HTR). A process for preparation of UO2 kernels known as total gelation process of uranium (TGU) was developed as the production process of 10 mW HTR at Tsinghua University. The TGU process is based on the traditional sol-gel process, external gelation process and internal gelation process of uranium (EGU and IGU), which implies that the gelation action is initiated both by ammonia out of the gel particles and hemxamethyl tetra-amine (HMTA) inside the gel particles. The gelation behavior and the properties of uranium microspheres were investigated of the solution with and without HMTA. It is observed that good spherical particles can be obtained without HMTA in the sol, which indicates a more controllable and industrialized route will be set up. Contrasts between this route and the traditional EGU were also listed.

关键词： gelation process of uranium high temperature reactor (HTR) UO2 microsphere

Preparing UO_2 kernels by gelcasting

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Nuclear Science and Techniques 2009年第2期20卷 124-128页

作者： GUO Wenli liang tongxiang ZHAO Xingyu HAO Shaochang LI Chengliang Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

A process named gel-casting has been developed for the production of dense UO2 kernels for the high-temperature gas-cooled *** with the sol-gel process,the green microspheres can be got by dispersing the U3O8 slurry in gelcasting process,which means that gelcasting is a more facilitative process with less waste in fabricating UO2 *** UO2 kernels with the size of 500 μm,O/U≤2.01,density of 10.70 g·cm-3 were obtained by gel-casting process followed by heat treatment.

关键词：凝胶注模成型内核高温气冷实验堆铀成型过程溶胶凝胶法 U3O8 高密度

Interfacial engineering regulated by CeOx to boost efficiently alkaline overall water splitting and acidic hydrogen evolution reaction

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Journal of Materials Science & Technology 2022年第25期120卷 129-138页

作者： Jian Chen Zhen Hu Yang Ou Qinghua Zhang Xiaopeng Qi Lin Gu tongxiang liang College of Rare Earth Jiangxi University of Science and TechnologyGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Institute of Physics Chinese Academy of ScienceBeijing 100190China

Development of a low-cost and durable bifunctional electrocatalyst with high catalytic activity by hybridizing rare earth metal and non-noble metal is of utmost ***,a bifunctional electrocatalyst consisting of MoO_(2)and CeO_(x)heterostructure is synthesized via interfacial ***,due to its unique hetero-interface with abundant oxygen vacancies,the MoO_(2)-CeO_(x)_(x)/NF is able to exhibit outstanding hydrogen evolution reaction(HER) performance with an overpotential of 26 mV at 10 mA cm^(-2),and a preferable oxygen evolution reaction(OER) overpotential of 272 mV at 100 mA cmin 1 M *** recorded HER and OER overpotentials of MoO_(2)-CeO_(x)/NF are clearly smaller than those of Pt/C(HER overpotential of 27 mV) and RuO(OER overpotential of 393 mV) at the same current *** importantly,MoO_(2)-CeO_(x)/NF can also exhibit good HER activity with an overpotential of 50 mV at 10 mA cmin acidic ***,it is expected that this work can offer a new approach in the realization of high-catalytic alkaline overall water splitting and acidic HER performance through the rational design of rare-earth metal and non-noble metal heterostructure.

关键词： Heterostructure Oxygen vacancies Cerium oxide Overall water splitting