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| 1 | Relaxor behavior of (1-x)Pb(Mg_(1/3)Nb_(2/3))O_3-xPbTiO_3 ceramics显示文摘In the present work, the phase transitions and relaxor behavior of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT, x = 0.2―0.4) ferroelectric ceramics have been investigated by means of X-ray diffraction, di-electric spectroscopy, the P-E hysteresis loop measurements and Raman scattering techniques. Structural analysis revealed that with the increase of PbTiO3 content, PMN-PT ceramics experienced a gradual phase transition process from rhombohedral to tetragonal. It is usually believed that such kinds of phase transitions resulted in the linear decrease of relaxation degree. Surprisingly, our analysis of the dielectric spectra revealed that the indicator of the degree of diffuseness γ reached the maximum value near morphotropic phase boundary (MPB) (x = 0.32), then decreased with the further increase of PbTiO3 content. The large dielectric relaxor feature near MPB may be attributed to the for-mation of ordered nanodomains, resulting from complex coexisting nanostructures. Further, the P-E hysteresis loop measurements and Raman analysis of the B-site cation order correlated well with the dielectric measurement results. It was found that the hysteresis loop squareness Rsq received the minimum value while the inverse of the value of full wide of half maximum (FWHM) of A1g mode reached the maximum value at MPB composition, which showed similar trends to γ. | WU NingNing SONG XueMei HOU YuDong ZHU ManKang WANG Chao YAN Hui | 2009 | Chinese Science Bulletin2009，54，7： | 2 |
| 2 | Boron nitride synthesized at ambient pressure and room temperature by plasma electrolysis显示文摘 | Jing Guo Hao Wang JingSen Zhu Kun Zheng ManKang Zhu Hui Yan Masahiro Yoshimura | 2007 | Electrochemistry Communications2007，，7： | 1 |
| 3 | Synthesis of fine Pb(Fe 0.5 Nb 0.5 )O 3 perovskite powders by coprecipitation method显示文摘 | Jianlan Tang Mankang Zhu Tao Zhong Yudong Hou Hao Wang Hui Yan | 2006 | Materials Chemistry and Physics2006，，： | 1 |
| 4 | Synthesis and characterization of layered niobate K4Nb6O17 thin films by niobium-chelated precursor显示文摘 | Zhong Tao Tang Jianlan Zhu Mankang | 2005 | Journal of Crystal Growth2005，285，12： | 1 |
| 5 | Struc- ture and electrical properties of PMZN-PZT quaternary ceramics for piezoelectric transformers显示文摘 | Hou Yudong Zhu Mankang Tian Changsheng | 2004 | Sensors and Actuators A2004，116，： | 1 |
| 6 | Preparation and characterization of Ba 2 TiSi 2 O 8 ferroelectric films produced by sol–gel method显示文摘 | Wukun Dai Mankang Zhu Y.D Hou Hao Wang Hui Yan Mingming Shao Xiaoyang Chen J.B Xu | 2004 | Materials Letters2004，，： | 1 |
| 7 | Preparation and properties of BaTiSi 2 O 7 glass-ceramics显示文摘 | Mankang Zhu Bo Wang Peng Liu Hui Yan Zhenya Ding | 2003 | Optical Materials2003，，： | 1 |
| 8 | Hydrothermal synthesis of strontium tantalate powder显示文摘 | WANG HAO LIU JINGBING ZHU MANKANG | 2003 | Materials Letters2003，57，： | 1 |
| 9 | LOW-FIRING SOL-GEL DERIVED Mn-DOPED 0.92(K_(0.5)Na_(0.5))NbO_(3)-0.08LiNbO_(3)LEAD-FREECERAMICS WITH ENHANCED PIEZOELECTRIC PROPERTIES显示文摘Mn-doped 0.92(K_(0.5)Na_(0.5))NbO_(3)-0.08LiNbO_(3)(0.92KNN-0.08LN)lead-free piezoelectric cer-amics have been prepared by a developed sol-gel routes using Nb_(2)O_(5)as Nb source.Due to thehigh quality of gel precursor,Mn-doped 0.92KNN-0.08LN nanopowders with the mean particlesize about 20 nm were obtained at 500℃.The addition of Mn can promote the densification ofnanopowders effectively at 950℃,and also influences in a pronounced way both the crystal structure and microstructure of the materials.With the increase of the amount of Mn addition,0.92KNN-0.08LN ceramics are transformed from dominant orthorhombic to coexistence of the orthorhombic and tetragonal phases,and the grain sizes are enhanced simultaneously.Optimizedparameters,such as d_(33)=212 pC/N and k_(p)=0.46,were achieved in 0.2 Mn-doped0.92KNN-0.08LN systems,which are good candidate material for lead-free piezoelectric devices. | YUDONG HOU CHAO WANG JINGYANG RONG HAIYAN GE MANKANG ZHU HUI YAN | 2011 | Journal of Advanced Dielectrics2011，1，4： | 0 |
| 10 | Enhanced electrical resistivity and mechanical properties in BCTZ-based composite ceramic显示文摘Environmental and human health concerns about lead toxicity have prompted the development of lead-free piezoceramics.Among them,(Ba_(0.85)Ca_(0.15))(Zr_(0.1)Ti_(0.9))O_(3)(BCTZ)with excellent piezoelectric properties has the most potential and attracts extensive attention.However,lack of concern toward electrical resistivity and mechanical properties has greatly hindered its practical application.Here,we report the achievement of enhanced insulation characteristics(grain electrical resistivity increased by one order of magnitude)and superior mechanical properties(Vickers hardness value increased by 40%)in Al_(2)O_(3)-added BCTZ composite ceramics.Such improvement can be attributed to specific composite microstructure,where the nonferroelectric second phase dispersed in the grain interior and grain boundary of BCTZ matrix results in blocking effect on the electric current paths as well as propagation of microcracks.These findings will pave a new way for the practical application of BCTZ ceramics. | Xiaodong Yan Mupeng Zheng Mankang Zhu Yudong Hou | 2019 | Journal of Advanced Dielectrics2019，9，5： | 0 |
| 11 | Relaxation mechanism analysis of synthetic fused quartz glass investigated by electrical impedance spectra显示文摘The synthetic fused quartz glasses with bare metal impurities have been analyzed by temperaturedependent electrical impedance spectroscopy. The complex electric impedance and the overlapping of the normalized dielectric modulus imply the single mechanism of dielectric and conduction relaxation in the fused quartz glass.Besides, the dependence of conductivity on temperature may attribute to the predominant electric relaxation to the delocalized or long range electronic hopping between the nonbridged dangling oxygen. | Yuanjie Jia Xingxuan Wu Mankang Zhu Yudong Hou | 2014 | Chinese Science Bulletin2014，59，26： | 0 |
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