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Progress in Natural Science:Materials International 2015年第5期25卷 399-404页

作者： Dong Xu Kai He Buhua Chen Chuanmeng Xu Shuyu Mu Lei Jiao Xiujuan Sun Yongtao Yang School of Material Science and Engineering Jiangsu University State Key Laboratory of Tribology Tsinghua University changzhou ming errui ceramics co. Ltd.

This paper focuses on the effects of alkline-earth metal titante AETiO(AE = Mg,Ca,Sr) doping on the microstructure and electric characteristics of CaCuTiOthin films prepared by the sol-gel *** results showed that the grain size of CCTO thin films co.ld be increased by *** movement of the grain boundaries was impeded by the seco.d phases of CaTiOand SrTiOco.centrating at grain boundaries in CaTiOand SrTiOdoped CCTO thin *** ascent of dielectric co.stant co.ld be observed in 0.1Mg TiOdoped CCTO thin films,which was almost as three times high as pure CCTO thin film and the descent of the dielectric loss at low frequency co.ld also be *** addition,the nonlinear co.fficient(α),threshold voltage(V) and leakage current(I) of AETiOdoped CCTO thin films(AE = Mg,Ca,Sr) showed different variation with the increasing co.tent of the MgTiO,CaTiOand SrTiO.

关键词： Thin films Microstructure Dielectric properties Sol–gel method Alkline-earth metal titante

Microstructure and electrical properties of Sc_2O_3-doped CaCu_3Ti_4O_(12) ceramics

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Rare Metals 2015年第3期34卷 178-182页

作者： Dong Xu Ke Zhang Lei Jiao Kai He Hong-Xing Xu Guo-Ping Zhao Ren-Hong Yu School of Material Science and Engineering Jiangsu University State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China changzhou Engineering Research Institute of Jiangsu University changzhou ming errui ceramics co. Ltd.

CaCu3Ti4O12 ceramics doped with different co.tents of Sc203 （mol%, x = 0, 0.05, 0.10, 0.15, and 0.20） were prepared by the traditional solid-state reaction method. Scanning electron microsco.e （SEM） and X-ray diffraction （XRD） were used in the microstructural studies of the specimen, and the electrical properties were inves- tigated. XRD results show that the Sc has no influence on the phase co.position. The results from the dielectric measurements show that further increase of Sc doping co.ld decrease the dielectric loss slightly. A high dielectric co.stant and low dielectric loss can be achieved when the doping co.centration is 0.10 mol%.

关键词： CaCu3Ti4012 Rare earth Dielectricproperties Varistor Microstructure

Microstructure and electrical properties of La_2 O_3-doped ZnO-based varistor thin films by sol-gel process

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Journal of Central South University 2014年第1期21卷 9-13页

作者：徐东姜斌崔凤单杨永涛徐红星宋琪于仁红 School of Material Science and Engineering Jiangsu University State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China changzhou ming errui ceramics co. Ltd.

Microstructure and electrical properties of La2 O3-doped ZnO-Bi2 O3 thin films prepared by sol–gel process have been investigated.X-ray diffraction shows that most diffraction peaks of ZnO are equal,and the crystals of ZnO grow *** electron microsco.y and atomic force microsco.y results indicate that the samples have a good structure and lower surface *** nonlinear V–I characteristics of the films show that La2 O3 develops the electrical properties largely and the best doped co.tent is 0.3% lanthanum ion,with the leakage current of 0.25 mA,the threshold field of 150 V/mm and the nonlinear co.fficient of 4.0 in detail.

关键词： zinc oxide varistor film sol-gel process electrical properties microstructure

Effects of Eu_2O_3 doping on microstructural and electronic properties of ZnO Bi_2O_3-based varistor ceramics prepared by high-energy ball milling

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Journal of Central South University 2013年第11期20卷 2947-2953页

作者：董玉娟崔凤单焦雷徐红星唐冬梅吴婕婷于仁红徐东 Faculty of Science Jiangsu University School of Material Science and Engineering Jiangsu University State key Laboratory of Electronic Thin Films and Integrated Devices (University of Electronic Science and Technology of China) changzhou Engineering Research Institute of Jiangsu University changzhou ming errui ceramics co. Ltd.

ZnO-Bi2O3-based varistor ceramics doped with EU2O3 in a range from 0 to 0.4% were obtained by high-energy ball milling and fired at 900-1000 ℃ for 2 h. XRD and SEM were applied to determine the phases and microstructure of the varistor ceramics. A DC parameter instrument was applied to investigate the electronic properties and V-I characteristics. The XRD analysis of Eu2O3-doped ZnO-Bi2O3-based varistor ceramics shows that the ZnO, Eu-co.taining Bi-rich, Zn7Sb2O12-type spinel and Zn2Bi3Sb3O14-type which is the pyrochlore phase are present. With increasing Eu2O3 co.tent, the average size of ZnO grain firstly decreases and then increases. The grain boundary defect model was particularly used to explain the excellent nonlinearity of ZnO-Bi2O3-based varistor ceramics with the addition of0.1% Eu2O3 and sintered at 950 ℃.

关键词： ceramics varistors rare earth microstructure electronic properties

Highly nonlinear property and threshold voltage of Sc_2O_3 doped ZnO-Bi_2O_3-based varistor ceramics

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Journal of Rare Earths 2013年第2期31卷 158-163页

作者：徐东吴婕婷焦雷徐红星张培枚于仁红程晓农 School of Material Science and Engineering Jiangsu University Key Laboratory of Semico.ductor Materials Science Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China changzhou Engineering Research Institute of Jiangsu University changzhou ming errui ceramics co. Ltd.

A series of ZnO-Bi2O3-based varistor ceramics doped with 0-0.4 mol.% Sc2O3 were prepared by high-energy ball milling and sintered at temperatures between 1000 and 1150oC. X-ray diffractometry （XRD） and scanning electron microsco.y （SEM） were applied to characterize the phases and microstructure of the varistor ceramics. A DC parameter instrument for varistor ceramics was applied to investigate the electronic properties and V-I characteristics. The results showed that there were no changes in crystal structure with Sc2O3-doped varistor ceramics and that the average size of ZnO grain increased first and then decreased. The best electronic characteristics of the varistor ceramics prepared by high-energy ball milling were found in 0.3 mol.% Sc2O3-doped ZnO-Bi2O3 -based ceramics sintered at 1000 oC, which exhibited a threshold voltage of 821 V/mm, nonlinear co.fficient of 62.1 and leakage current of 0.16 μA.

关键词： ceramics varistors rare earth alloys and co.pounds microstructure electrical properties

Al-modification for PS-PVD 7YSZ TBCs to improve particle erosion and thermal cycle performances

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Journal of Advanced ceramics 2022年第7期11卷 1093-1103页

作者： Xiaofeng ZHANG ming LI Ao ZHANG Shuangquan GUO Jie MAO Chunming DENG Panpan WANG Changguang DENG Junli FENG Min LIU Kesong ZHOU Cheng LAI National Engineering Laboratory for Modern Materials Surface Engineering Technology&the Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China PERA Guangzhou Information Technology co. Ltd.Guangzhou 510650China Chengdu Holy(Group)Industry co. Ltd.Chengdou 610000China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China Shenzhen Customs Industrial Products Inspection Technology Center Shenzhen 518067China

Plasma spray-physical vapor deposition(PS-PVD)as a novel process was used to prepare feather-like co.umnar thermal barrier co.tings(TBCs).This special microstructure shows good strain tolerance and non-line-of-sight(NLOS)deposition,giving great potential application in ***,due to serious service environment of aero-engine,particle erosion performance is a weakness for PS-PVD 7YSZ *** a solution,an Al-modification approach was proposed in this *** in-situ reaction of Al and ZrO2,anα-Al2O3 overlay can be formed on the surface of 7YSZ co.umnar *** results demonstrate that this approach can improve particle erosion resistance since hardness improvement of Al-modified ***,as another important performance of thermal cycle,it has a better optimization with 350-cycle water-quenching,co.pared with the as-sprayed TBCs.

关键词： plasma spray-physical vapor deposition(PS-PVD) thermal barrier co.tings(TBCs) Al-modification particle erosion resistance thermal cycle performance