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| 1 | Realizing high low-electric-field energy storage performance in AgNbO_(3) ceramics by introducing relaxor behaviour显示文摘Both sustainable development in environment and safety of high-power systems require to develop a novel lead-free dielectric capacitor with high energy density(Wrec)at low applied electric field.In this work,a remarkably high Wrec of 2.9 J/cm^(3) accompanying with energy storage efficiency of 56% was achieved in Ag_(0.9)Sr_(0.05)NbO_(3) ceramic at a low applied electric field of 190 kV/cm,by improving antiferroelectricity and introducing relaxor behaviour.The improved anti-ferroelectric stability was attributed to the decreased tolerance factor and average electronegativity difference,while the relaxor behaviour was associated with the increased disordered local structure by Sr-doping.Moreover,the Ag_(0.9)Sr_(0.05)NbO_(3) ceramics also exhibited outstanding temperature stability in energy density with small variation less than 5% over 20-140℃.The results indicate that the Ag_(0.9)Sr_(0.05)NbO_(3) ceramic is a promising candidate for low-electric-field driving capacitors. | Kai Han Nengneng Luo Shuaifei Mao Fangping Zhuo Xiyong Chen Laijun Liu Changzheng Hu Huanfu Zhou Xinpeng Wang Yuezhou Wei | 2019 | Journal of Materiomics2019，5，4： | 5 |
| 2 | Phase evolution, microstructure, electric properties of (Ba1–xBi0.67xNa0.33x)(Ti1–xBi0.33xSn0.67x)O3 ceramics显示文摘(Ba1–xBi0.67xNa0.33x)(Ti1–xBi0.33xSn0.67x)O3(abbreviated as BBNTBS,0.02≤x≤0.12)ceramics were fabricated via a traditional solid state reaction method.The phase transition of BBNTBS from tetragonal to pseudo cubic is demonstrated by XRD and Raman spectra.The BBNTBS(x=0.1)ceramics have decent properties with a highεr(~2250),smallΔε/ε25℃ values of±15%over a wide temperature range from–58 to 171℃,and low tanδ≤0.02 from 10 to 200℃.The basic mechanisms of conduction and relaxation processes in the high temperature region were thermal activation,and oxygen vacancies might be the ionic charge transport carriers.Meanwhile,BBNTBS(x=0.1)exhibited decent energy storage density(Jd=0.58 J/cm3)and excellent thermal stability(the variation of Jd is less than 3% in the temperature range of 25–120℃),which could be a potential candidate for high energy density capacitors. | Xiuli CHEN Xu LI Huanfu ZHOU Jie SUN Xiaoxia LI Xiao YAN Congcong SUN Junpeng SHI | 2019 | Journal of Advanced Ceramics2019，8，3： | 4 |
| 3 | A NEW ANIMAL MODEL OF ERYTHROCYTE SENESCENCE: THE ALTERRATION OF SURFACE CHARGE AND THE RHEOLOGGICAL PROPERTIES OF ERRYTHROCYTE DRUING ITS LIFE SPAN显示文摘Based on Mohandas' work, a new animal model of red blood cell(RBC) synchronous senescence in a near normal physiological conditions was proposed. Using this model,we studied the changes of RBC surface charge with the aging process. The results showed that its surface charge decreased with RBC agingprocess. Nevertheless,the regulation of the changes was not linear during RBC aging. The indexes of (DI)d and (DI)or describing RBC rheological behaviours duringits aging process were measured with a new Ektacytometry. It is demonstrated thatboth the indexes decreased with RBC aging,but the relationship was not linear. Thecharacteristics of the indexes displayed a common regularity of smaller alterationsin the first half period of RBC life span and greater alterations in the latter periodof RBC life span. It was also shown that the regulation of the changes for each individual index were not alike. The alterations of RBC mechanical properties duringlife span maight result from the influence of RBC shape, the properties of cytoplasm and membrane viscoelasity and the other factors during RBC aging. | Wen Zongyao Song Lichua Lu Zhihong Sun Dagong(Department of Medical Physics, Beijing Medical University, Beijing 100083,China) Yan Zongyi(Department of Mechanics and Engineering SciencePeking University,Beijing 100871,China) Don Huanfu(Department of H | 1998 | Chinese Journal of Biomedical Engineering(English Edition)1998，7，2： | 3 |
| 4 | High energy storage density and power density achieved simultaneously in NaNbO_(3)-based lead-free ceramics via antiferroelectricity enhancement显示文摘High-performance lead-free dielectric ceramics with simultaneously high energy storage density and power density are in high demanded for pulse power systems.To realize excellent energy-storage characteristics,a strategy to enhance antiferroelectricity and construct a local random field simultaneously was proposed in this study.Based on the above strategy,a series of(1-x)NaNbO_(3)-xBi(Ni_(1/2)Sn_(1/2))O3[xBNS,x=0.05,0.10,0.15,0.20,and 0.22]solid solutions were designed and fabricated.An ultrahigh energy storage density(Utotal)of 7.35 J/cm^(3),and recoverable energy density(Urec)of 5.00 J/cm^(3) were achieved in the 0.10BNS ceramics.In addition,an adequate stability of energy storage properties at a range of temperatures(20e140℃),frequencies(1e100 Hz),and fatigue test durations(1e1-10^(4) cycles)were realized in 0.10BNS ceramics.0.10BNS ceramics displayed a high current density of 1005 A/cm2,an ultrahigh power density of 100.5 MW/cm^(3,)and an ultrashort discharge time of 46.5 ns?This remarkable performance not only justified our strategy but also confirmed 0.10BNS ceramics as a promising candidate for energy storage. | Xiaoyan Dong Xu Li Xiuli Chen Hongyun Chen Congcong Sun Junpeng Shi Feihong Pang Huanfu Zhou | 2021 | Journal of Materiomics2021，7，3： | 2 |
| 5 | Microwave dielectric properties of 3Li20-Nb20- 3TiO2 ceramics with Li20 V20, additions显示文摘 | Huanfu Zhou Hong Wang Xiaoyan Ding | 2009 | Journal of Materials Science :Mater Electrort2009，20，： | 1 |
| 6 | Effect of B203 and CuO additions on the sintering temperature and microwave dielectric properties of 3Li20-Nb205 3TiO2 ceramics显示文摘 | Huanfu Zhou Hong Wang Kecheng Li | 2009 | Journal of Materials Science:Mater Electron2009，20，： | 1 |
| 7 | Effect of B2O3 and CuO additions on the sintering temperature and microwave dielectric properties of 3Li2O–Nb2O5–3TiO2 ceramics显示文摘 | Huanfu Zhou Hong Wang Kecheng Li Xi Yao | 2009 | Journal of Materials Science: Materials in Electronics2009，，3： | 1 |
| 8 | Microwave dielectric properties of 3Li2O-Nb2O5-3TiO2 ceramics with Li2O-V2O5 additions显示文摘 | Huanfu Zhou Hong Wang Xiaoyan Ding and Xi Yao | 2009 | J Mater Sci: Mater Electron2009，20，： | 1 |
| 9 | Ef feet of B2O3 and CuO additions on the sintering temperature and microwave dielectric properties of 3Li2O-Nb2O5-3YiO2 ceramics显示文摘 | Huanfu Zhou Hong Wang Kecheng Li and Xi Yao | 2009 | J Mater Sci:Mater Electron2009，20，： | 1 |
| 10 | 5Li2O-Nb2O5-7TiO2 ceramics显示文摘 | Huanfu Zhou HongWang Minghui Zhang Xi Yao Microwave dielectric properties of the 5 | 2009 | Appl Phys A2009，95，： | 1 |
| 11 | Microwave di- electric properties and its compatibility with silver electrode of Liz MgTis O8 ceramics显示文摘 | Chen Xiuli Zhou Huanfu Fang Liang | 2011 | J Alloy Compd2011，509，19： | 1 |
| 12 | Low-tempera- ture sintering and compatibility with silver electrode of Ba4 MgTill 027 microwave dielectric ceramic 显示文摘 | Chen Xiuli Zhou Huanfu Fang Liang | 2010 | Mater Res Bull2010，45，10： | 1 |
| 13 | Microwave dielectric properties of temperature stable Li 2 Zn x Co 1? x Ti 3 O 8 ceramics显示文摘 | Liang Fang Dongjin Chu Huanfu Zhou Xiuli Chen Hui zhang Baocheng Chang Chunchun Li Yuandong Qin Xi Huang | 2011 | Journal of Alloys and Compounds2011，，： | 1 |
| 14 | Low temperature sintering and microwave dielectric properties of Ba3Ti5Nb6O28 ceramics、with BaCu(B2O5)addirions显示文摘 | Huanfu Zhou HongWang Yuehua Chen etl | 2009 | Mate rials Chemistry and Physics2009，113，： | 1 |
| 15 | Phase struc- ture and microwave dielectric properties of (1 --x) LizZrTi4Olz-xTiOz ceramics显示文摘 | Liu Xiaobin Zhou Huanfu Fang Liang | 2012 | J Alloys Compd2012，515，25： | 1 |
| 16 | A new microwave dielectric ceramic for LTCC applica- tions显示文摘 | ZHOU Huanfu CHEN Xiuli FANG Liang | 2010 | Journal of Materials Science Materials in Electronics2010，21，8： | 1 |
| 17 | Effect of B2 Os and CuO additions on the sintering tem- perature and microwave dielectric properties of 3Li20- Nb2O5-3TiO2 ceramics 显示文摘 | ZHOU Huanfu WANG Hong LI Kecheng | 2009 | Journal of Materials Sci- ence Materials in Electronics2009，20，3： | 1 |
| 18 | Effects of BaCu(B2O5) addition on phase transition, sintering tempe- rature and microwave properties of Ba4LiTa3O12 ceramics 显示文摘 | Chu Dongjin Fang Liang Zhou Huanfu | 2011 | J Alloys Compd2011，509，5： | 1 |
| 19 | Lattice vibrational characteristics,crystal structures and dielectric properties of non-stoichiometric Nd_((1+x))(Mg_(1/2)Sn_(1/2))O_(3) ceramics显示文摘Non-stoichiometric Nd_((1+x))(Mg_(1/2)Sn_(1/2))O_(3)(-0.04=x≤0.04,NMS)ceramics were fabricated via a conventional solid-state reaction method.Crystal structures and morphologies were investigated by Xray diffraction(XRD)and scanning electron microscopy(SEM),respectively.The main crystalline phase is monoclinic Nd(Mg_(1/2)Sn_(1/2))O_(3) with a double perovskite structure(P21/n space group)for the NMS system proved by XRD.The sample at x=0.01 has the best crystallinity and evenly distributed crystal grains observed by SEM.The optimum performances(ε_(r)=19.87,Q×f=41840 GHz,f=12.05 GHz)are obtained at x=0.01.Lattice vibrational modes of the Raman spectra were assigned and illustrated,in detail.The dielectric properties obtained by fitting infrared reflectance spectra with the help of four-parameter semi-quantum model are consistent with the calculated values by microscopic polarization and damping coefficients.The reverse translational vibration of the NdeMgO_(6),the F_(5u)^((5)) mode,provides the greatest contribution to the dielectric response.The relationships between crystal structures and dielectric properties were mainly established using lattice vibrational modes as a media. | Zhikai Cao En-Cai Xiao Xue-Hui Li Zhenxing Yue Guohua Chen Ying Chen Kaixin Song Huanfu Zhou Ze-Ming Qi Feng Shi | 2020 | Journal of Materiomics2020，6，3： | 1 |
| 20 | Sintering behaviour and microwave dielectric properties of MgO-2B_(2)O_(3)--xwt%BaCu(B_(2)O_(5))-ywt%H_(3)BO_(3) ceramics显示文摘This study investigates the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) series ceramics synthesised by solid-state reaction.According to the X-ray diffraction and microstructural analyses,the as-prepared MgO-2B_(2)O_(3) ceramics possess a single-phase structure with a rod-like morphology.The effects of different quantities of H_(3)BO_(3) and BaCu(B_(2)O5)(BCB)on the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) ceramics were investigated.Accordingly,the optimal sintering temperature was obtained by adding 30 wt%H_(3)BO_(3) and 8 wt%BCB.We also reduced the sintering temperature to 825°C.Furthermore,the addition of 40 wt%H_(3)BO_(3) and 4 wt%BCB increased the quality factor,permittivity,and temperature coefficient of resonance frequency of MgO-2B_(2)O_(3) to 44,306 GHz(at 15 GHz),5.1,and-32 ppm/℃,respectively.These properties make MgO-2B_(2)O_(3) a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics. | Haiquan WANG Shixuan LI Kangguo WANG Xiuli CHEN Huanfu ZHOU | 2021 | Journal of Advanced Ceramics2021，10，6： | 0 |
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