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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 | 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 |
| 4 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | 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 |
| 9 | 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 |
| 10 | 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 |
| 11 | 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 |
| 12 | 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 |
| 13 | 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 |
| 14 | 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 |
| 15 | 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 |
| 16 | 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 |
| 17 | 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 |
| 18 | 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 |
| 19 | 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 |
| 20 | UltrahighQ Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas显示文摘Microwave dielectric ceramics should be improved to advance mobile communication technologies further.In this study,we prepared Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics with nonstoichiometric Sr^(2+)ratios based on our previously reported SrY_(2)O_(4) microwave dielectric ceramic,which has a low dielectric constant and an ultrahigh quality factor(Q value).The ceramic exhibited a 33.6% higher Q-by-frequency(Q×f)value(Q≈12,500)at x=0.02 than SrY_(2)O_(4).All Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited pure phase structures,although variations in crystal-plane spacings were observed.The ceramics are mainly composed of Sr-O,Y1-O,and Y_(2)-O octahedra,with the temperature coefficient of the resonant frequency(τ_(f))of the ceramic increasing with Y_(2)-O octahedral distortion.The ceramic comprises uniform grains with a homogeneous elemental distribution,clear grain boundaries,and no obvious cavities at x=0.02.The Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited good microwave dielectric properties,with optimal performance observed at x=0.02(dielectric constant(εr)=15.41,Q×f=112,375 GHz,and τ_(f)=-17.44 ppm/℃).The τ_(f) value was reduced to meet the temperaturestability requirements of 5G/6G communication systems by adding CaTiO_(3),with Sr_(1.02)Y_(2)O_(4.02)+2wt% CaTiO_(3) exhibiting ε_(r)=16.14,Q×f=51,004 GHz,andτf=0 ppm/℃.A dielectric resonator antenna prepared using Sr_(1.02)Y_(2)O_(4.02)+2wt%CaTiO_(3) exhibited a central frequency of 26.6 GHz,with a corresponding gain and efficiency of 3.66 dBi and 83.14%,respectively.Consequently,Sr_(1.02)Y_(2)O_(4).02-based dielectric resonator antennas are suitable for use in 5G millimeter-wave band(24.5-27.5 GHz)applications. | Guoqiang He Yu Jiang Kaixin Song Yanjun Liu Yuan Nie Wenjie Zhang Ziqi Zhao Yinghan He Xinyue Ma Xiuli Chen Xu Li Huanfu Zhou | 2024 | Journal of Advanced Ceramics2024，13，2： | 0 |
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