汪宏
电子陶瓷材料与器件、周期性结构电磁材料和材料的介电性能测量
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- 姓名:汪宏
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学术头衔:
博士生导师
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学科领域:
微电子学
- 研究兴趣:电子陶瓷材料与器件、周期性结构电磁材料和材料的介电性能测量
汪宏,女,1969年生,工学博士,西安交通大学教授,博士生导师。1990年、1995年和1998年于西安交通大学电子材料与元器件专业毕业并分别获学士、硕士和博士学位,1995年留校工作,1998年5月晋升为副教授,2002年9月晋升为教授,2003年6月获得博士生导师资格。2001年在韩国新昌电机株式会社任高级访问研究员,2003年在德国于利希国家研究中心任访问教授。现在西安交通大学电子陶瓷与器件教育部重点实验室从事电子材料与器件方面的研究工作,目前主要研究方向是电子陶瓷材料与器件、周期性结构电磁材料和材料的介电性能测量。先后主持承担了国家高技术计划(863)新材料领域重大项目、教育部优秀青年教师基金和国家重点基础研究发展计划(973)项目子课题等。已在国内外核心期刊和国际会议上发表学术论文40余篇,应邀在重要的国际会议上作特邀报告3次,获得授权发明专利1项,通过省部级技术鉴定3项,获得2002年教育部提名国家自然科学奖一等奖1项和陕西省科学技术奖(自然类)二等奖1项。现为亚洲电子陶瓷联盟(AECA)执行委员会委员,美国材料研究学会(MRS)会员,西安电子科技大学宽禁带半导体教育部重点实验室学术委员会委员。先后应邀担任美国材料研究学报(J.Mater.Res.)、欧洲陶瓷国际杂志(Ceramics International)和科学通报的论文审稿人。
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【期刊论文】Dielectric resonator antennas using high permittivity ceramics
汪宏, Zhen Peng*, Hong Wang, Xi Yao
Ceramics International 30(2004)1211-1214,-0001,():
-1年11月30日
The dielectric resonator (DR) antennas with probe-feed in both cylindrical and rectangular shape using high permittivity ceramics were investigated. The bismuth-based low-firing ceramics with the ielectric constants of 97, 71 and 37 were adopted as dielectric materials, respectively. The result of theoretical calculation and experimental measurement are presented and analyzed.
Dielectric resonator antenna, High permittivity, Bismuth-based ceramic
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【期刊论文】Structures, Phase Transformations, and Dielectric Properties of Pyrochlores Containing Bismuth
汪宏, Xiaoli Wang, Hong Wang, and Xi Yao
Manuscript No.191513. Received September 16, 1996,-0001,():
-1年11月30日
The structures, phase transformations, and dielectric properties of pyrochlore ceramics containing bismuth were studied. The relation between the orthorhombic and cubic pyrochlores in the Bi2O3-ZnO-Nb2O5 (BZN) system has been investigated. The effect of bismuth in distorted cubic pyrochlore structures is discussed. BZN compositions with pyrochlore structures have excellent dielectric properties,very low dielectric loss, and high dielectric constants with stable frequency and temperature dependence.
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【期刊论文】Structural study of Bi2O3-ZnO-Nb2O5 based pyrochlores
汪宏, Wang Hong*, Du Huiling, Yao Xi
W. Hong et al./Materials Science and Engineering B99(2003)20/24,-0001,():
-1年11月30日
The cubic pyrochlore structure of Bi1. 5Zn1. 0Nb1. 5O7 was investigated. The crystal chemical formula of this material was determined as Bi1. 5Zn0.5 (Zn0.5Nb1.5) O7 by comparing the calculated theoretical X-ray diffraction intensities with the observed ones. Crystal structure parameters were refined by Rietveld method. The (Bi1.5 2yZn1 2yNb1.5) O7 y crystalline samples were also examined by Raman spectroscopy to look for further short range structural information. The results show that the Nb/O and Zn/O tretching modes in the B site oxide octahedral almost do not change with the chemical constitution changing. It is reasonable that the movable Zn2 is inclined to occupy B site first and then enter into A site after the B site was stuffed.
Pyrochlore, Crystal structure, Raman spectroscopy, Rietveld method
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汪宏, Hong Wang and Xi Yao
J. Mater. Res., Vol. 16, No.1, Jan 2001,-0001,():
-1年11月30日
The structure and dielectric properties of Bi2O3-ZnO-Nb2O5-based ceramics with pyrochlore-fluorite biphase structure were investigated. Mixed-sintered ceramics were prepared by two precalcined constituents in the system of x [Bi1.5Zn0.5 (Zn0.5Nb1.5)O7]-(1-x)Bi3/4Nb1/4O7/4 (0.05x0.35), where Bi1.5Zn0.5 (Zn0.5Nb1.5) O7 is a cubic pyrochlore (a) and Bi3/4Nb1/4O7/4 is a defect cubic fluorite (F). The phase composition of the mixed-sintered ceramics were characterized as a biphasic structure with a distorted pyrochlore (b) and a fluorite (F) coexisting. The phase ratio of b pyrochlore and F fluorite is related to the chemical composition x. The dielectric properties of the ceramics gradually change with their structure.
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汪宏
,-0001,():
-1年11月30日
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汪宏, Hong Wang a, *, Ralf Elsebrock, b, Theodor Schneller, c, Rainer Waser, Xi Yao a
H. Wang et al./Solid State Communications 132(2004)481-486,-0001,():
-1年11月30日
The preparation, microstructure development and dielectric properties of Bi1.5ZnNb1.5O7 pyrochlore ceramics by metalloorganic decomposition (MOD) route are reported. Homogeneous precalcined ceramic powders of 13-36nm crystallite size were obtained at temperatures ranging from 500 to 700 8C. The thermal decomposition/oxidation of the gelled precursor solution was chemically analyzed, TG/DTA, XRD, and SEM, led to the formation of a pure cubic pyrochlore phase with a stoichiometry close to Bi1.5ZnNb1.5O7 which begins to form at 500 8C. The metallo-organic precursor synthesis method, where Bi, Zn and Nb ions are chelated to form metal complexes, allows the control of Bi/Zn/Nb stoichiometric ratio on a molecular scale leading to the rapid formation of bismuth zinc niobate (Bi1.5ZnNb1.5O7) ceramic fine powders with pure pyrochlore structure. The powders were pressed into pellets and can be sintered at temperatures as low as 800-1000 8C. Fine crystalline ceramics with the grain size in the range of 200-500 nm have been obtained at the sintering temperature of 800 8C. The dielectric properties in high frequency to microwave range were measured and discussed.
A., BZN ceramic, B., Chemical synthesis, D., Dielectric properties
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汪宏, Hong Wang, Desheng Zhang, Xiaoli Wang, and Xi Yao
J. Mater. Res., Vol. 14, No.2, Feb 1999,-0001,():
-1年11月30日
The effect of La2O3 substitutions on structure and dielectric properties of Bi2O3-ZnO-Nb2O5-based ceramics was investigated. Bi1.52xLaxZn0.5 (Zn0.5Nb1.5) O7 samples were prepared by conventional ceramic processing technology. The crystal structure of the Bi1.5Zn0.5 (Zn0.5Nb1.5) O7 sample was characterized as a pure cubic pyrochlore. With a lower amount of La2O3 substitution, the crystal structures were still cubic pyrochlore. Superlattice x-ray diffraction line was identified for some compositions. With the increasing amount of La2O3 substitution, the crystal structure gradually transformed from pure cubic pyrochlore to LaNbO4 phase. The dielectric properties regularly changed with the structure change. The structure-properties relations of the ceramics are discussed.
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汪宏, Hong Wang*, Huiling Du, Zhen Peng, Meiling Zhang, Xi Yao
Ceramics International 30(2004)1225-1229,-0001,():
-1年11月30日
The effects of V2O5 on the phase formation and dielectric properties of Bi2O3-ZnO-Nb2O5 (BZN) pyrochlore ceramics were investigated. With the small amount of V2O5 substitution (0.005≤x≤0.05), the sintering temperatures of Bi1.5Zn0.5 (Zn0.5Nb1.5−xVx) O7 can be effectively reduced from 1000 to 840◦C while the phase structures still kept to be the pure cubic pyrochlores. The V2O5 seems to provide an eutectic melt below the sintering temperature to improve the sinterability. The dielectric constants decrease gradually with V2O5 substitution while the temperature coefficients of the samples continuously increase. The dielectric loss are in same level as that of the basic composition at the smaller substitute amount (x≤0.02) but then degraded in lower frequency when the substitution reached to x = 0.05. Obvious dispersion in the dielectric constant and loss was observed as a function of frequency and temperature after the substitution.
A., Powders: solid state reaction, C., Dielectric properties, Pyrochlore
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