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ferroelectric properties of Bi_4Zr_(0.5)Ti_(2.5)O_(12) thin films prepared on LaNiO_3 bottom electrode by sol-gel method

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Science China(Technological Sciences) 2007年第4期50卷 472-477页

作者： GUO DongYun1, LI MeiYa1, LIU Jun1, PEI Ling1, YU BenFang1, ZHAO XingZhong1, YANG Bin2, WANG YunBo2 & YU Jun2 1 Department of Physics, Wuhan University, Wuhan 430072, China 2 Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China Department of Physics Wuhan University Wuhan China Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan China

The Bi4Zr0.5Ti2.5O12 (BZT) thin films were fabricated on the LaNiO3 bottom electrode using sol-gel method. The structure and morphology of the films were character-ized using X-ray diffraction, AFM and SEM. The results show that the films have a perovskite phase and dense microstructure. The 2Pr and 2Vc of the Pt/BZT/LaNiO3 capacitor are 28.2 μC/cm2 and 14.7 V respectively at an applied voltage of 25 V. After the switching of 1×1010 cycles, the Pr value decreases to 87% of its pre-fatigue val-ues. The dielectric constant (ε) and the dissipation factor (tanδ) of the BZT thin films are about 204 and 0.029 at 1 kHz, respectively. The films show good insulating behavior according to the test of leakage current. The clockwise C-V hysteresis curve observed shows that the Pt/BZT/LaNiO3 structure has a memory effect be-cause of the BZT film’s ferroelectric polarization.

关键词： Bi_4Zr_(0.5)Ti_(2.5)O_(12) thin film sol-gel method LaNiO_3 bottom electrode ferroelectric properties

Effect of annealing process on structures and ferroelectric properties of Ca_(0.4)Sr_(0.6)Bi_(3.95)Nd_(0.05)Ti_4O_(15) thin films

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Journal of Rare Earths 2009年第2期27卷 216-221页

作者：范素华张伟王培吉张丰庆冯博楷 Department of Materials Science and Engineering Shandong Jianzhu UniversityJinan 250101China Department of Science Jinan UniversityJinan 250022China

Ca0.4Sr0.6Bi3.95Nd0.05Ti4O15 （C0.4S0.6BNT） ferroelectric thin films were prepared on Pt/Ti/SiO2/Si substrates by sol-gel method. Effect of annealing process （time and temperature） on structures and ferroelectric properties of C0.4S0.6BNT thin film was investigated. The relative intensity of （200） peak increased first then decreased with annealing temperature and became predominant at 800 ℃. In contrast, no evident change could be observed in the （001） peak. The remnant polarization （Pr） and coercive field （Ec） for C0.4S0.6BNT film annealed at 800℃ for 5 min were 21.6μC/cm2 and 68.3 kV/cm, respectively.

关键词： Ca0.4Sr0.6Bi3.95Nd0.05Ti4O15 thin films annealing process ferroelectric properties rare earths

Microstructure and ferroelectric properties of (Bi_(0.9)Ho_(0.1))_(3.999)Ti_(2.997)V_(0.003)O_(12) Thin Films Prepared by Sol-gel Method for Nonvolatile Memory

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Journal of Materials Science & Technology 2010年第8期26卷 679-681页

作者： Chengju Fu Zhixiong Huang Jie Li Dongyun Guo School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Mechanical Engineering Chongqing University of Science and Technology Chongqing 400042 China

The （Bi0.9Ho0.1）3.999Ti2.997V0.003012 （BHTV） films have been prepared on Pt/Ti/SiO2/Si substrates by solgel method. The microstructure and ferroelectric properties of the BHTV films were investigated. The BHTV films show a single phase of Bi-layered Aurivillius structure and dense microstructure. The Ho3＋/V5＋ cosubstitution can effectively improve the ferroelectric properties. The BHTV film exhibits good ferroelectric properties with 2Pr of 47.6℃/cm2, 2Ec of 265 kV/cm （at applied field of 420 kV/cm）, dielectric constant of 305, dielectric loss of 0.031 （at 1 MHz）, good insulting behavior, as well as the fatigue-free behavior.

关键词： (Bi0.9Ho0.1)3.999Ti2.997V0.003O12 thin films Sol-gel method Co-substitution ferroelectric properties Dielectric properties

Effect of Annealing on ferroelectric properties of Nanometre BaTiO3 Ceramics Prepared by High Pressure Sintering Method

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Chinese Physics Letters 2007年第1期24卷 244-247页

作者：李鹏飞靳常青肖长江王凤平王晓慧李龙土 Institute of Physics Chinese Academy of Sciences Beijing 100080 Department of Physics University of Science and Technology Beijing Beijing 100083 Department of Materials Science and Engineering Tsinghua University Beijing 100084

Dense nanocrystalline BaTiO3 ceramics with a grain size of 5Onto are prepared under 6 GPa at 1273K using a high pressure sintering method. The sintered bulk is uniform and the relative density is above 97%. We anneal the ceramic samples in oxygen with various temperatures and for the annealing, several broadened peaks can be observed at different times without apparent grain growth. After about 378K（ by dielectric measurements. However, these peaks are very different from those of coarser-grained ceramics. It is indicated that both the elimination of oxygen vacancies and the release of residual stresses caused by high pressure greatly improve the overall ferroelectric properties of BaTiO3 ceramics. The observation of nearly linear polarization hysteresis loop after anneal provides the solid evidence of ferroelectricity in these nano-sized BaTiO3 ceramics. It is believed that the absence of 90° domains and the existence of poor-permittivity nonferroelectric grain boundaries contribute to the slim loop.

关键词： Effect of Annealing ferroelectric properties Nanometre BaTiO_3 Ceramics High Pressure Sintering Method

Effect of Pb Substitution on the Microstructure and ferroelectric properties of Ba_(0.7)Sr_(0.3)TiO_3 Ceramic

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Journal of Wuhan University of Technology(Materials Science) 2008年第6期23卷 874-878页

作者：杨卫明 Department of Electronic Science and Technology Huazhong University of Science and Technology

ferroelectric Ba0.7Sr0.3TiO3（BST） and partially Pb^2＋ substituted for Ba^2＋ ceramics （Ba0.7-xPbx）Sr0.3TiO3 （x=0.1-0.4, BPST） were prepared by using conventional solid-reaction method. XRD analysis shows that the samples microstructure changes from cubic phase to tetragonal one with the Pb^2＋ content increasing. ESEM analysis shows that the Pb^2＋ substituted samples have a denser and more uniform surface morphology than that of pure BST. Measured electrical properties suggest that the Pb^2＋ substitution for Ba^2＋ in the BST system enhances the ferroelectric performance obviously when x=0.2. In addition, the substitution increases the samples Curie temperature （To） r （Ba0.5Pb0.2）Sr0.3TiO3 ceramic has good ferroelectric properties measured at a maximal electric field of 30 kV/cm under the condition of room temperature. The corresponding saturated polarization （Ps）, remnant polarization （Pr） and coercive field （Ec） is respectively 15.687 μC/cm^2, 8.100 μ C/cm^2 and 6.611 kV/cm. The measured Tc of （Ba0.5Pb0.2）Sr0.3TiO3 is 117 ℃.

关键词： Pb substitution BPST ceramics microstructure ferroelectric properties

Effect of Cl doping amount on the microstructure,photovoltaic properties and ferroelectric properties of Bi-based lead-free perovskite

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Journal of Advanced Dielectrics 2019年第2期9卷 14-20页

作者： Shilong Zhang Ruicheng Xu Zhendong Li Qianwei Zhang Li Cheng Zhenhua Wang Chunlin Fu School of Metallurgy and Materials Engineering Chongqing University of Science and Technology Chongqing 401331 P.R.China Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices Chongqing 401331P.R.China

Organic-inorganic hybrid perovskites with 3D perovskite structure have gained much attention as light harvesting materials in thinfilm *** is because of their outstanding light-absorption characteristics,charge-transport dynamics and their simple processability using lab-scale solution and vapor phase deposition ***,the inherent instability and lead toxicity of lead-based PSCs are the major problems at *** studies have shown that the(CH_(3)NH_(3)T_(3)Bi_(2)I_(9)(MBI)0D bismuth-based compound can be used as an optical absorption layer in solar *** this paper,the(CH_(3)NH_(3)T_(3)Bi_(2)I_(9)was doped with Cland a series of(CH_(3)NH_(3)T_(3)Bi_(2)I_(9-x)Cl_(x)films were *** effects of different doping amounts on the microstructure,photovoltaic properties and ferroelectric properties were systematically *** electron microscope(SEM)and Atomic force microscope(AFM)analysis showed that with the increase of doping content,the density of the films increased and the roughness *** photoelectric conversion efficiency of(CH_(3)NH_(3)T_(3)Bi_(2)I_(9-x)Cl_(x)raises with the increase of doping *** example,the photoelectric conversion efficiency of(C_(H)3NH_(3)T_(3)Bi_(2)I_(3)Cl_(6)is 0.473%.We find that the leakage current descends into the increase in doping content,which may be due to the increase in the film density and the decrease of *** research results have a positive effect on the development of Bi-based lead-free perovskite.

关键词： Lead-free perovskite photovoltaic properties ferroelectric properties microstructure

Piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)-BaTiO_(3) composite ceramics with Mg doping

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Journal of Advanced Dielectrics 2019年第1期9卷 34-39页

作者： Chaobin Jiang Chao Ma Qian Luo Kanghui Liu Lu Qin Zhentao Wu Wanqiang Cao Yong Chen School of Physics and Electronic Science Hubei University WuhanHubei 430062P.R.China Hubei Key Laboratory of Ferro-&Piezoelectric Materials and Devices School of Physics and Electronic Science Hubei University WuhanHubei 430062P.R.China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei University WuhanHubei 430062P.R.China MOE Key Laboratory of Green Preparation and Application for Functional Materials School of Materials Science and Engineering Hubei University WuhanHubei 430062P.R.China School of Materials Science and Engineering Hubei University WuhanHubei 430062P.R.China

As one of the representatives of lead-free NBT ceramics,Na_(0.5)Bi_(4.5)Ti_(4)O_(15) has still attracted much attention due to its excellent dielectric properties and has become the focus of ***,its piezoelectric properties are far from *** order to improve the piezoelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15),Na_(0.5)Bi_(4.5)Ti_(4-x)Mg_(x)O_(y)–BaTiO_(3)(NBTM–BT)composite ceramics were synthesized by a conventional mixed oxide route and sintered at 1040℃ through two-step *** optimized the electrical properties of NBTM–BT by changing the stoichiometric ratio of Mg content and studied its microscopic *** piezoelectric coefficient(d33)is stable at about 20 pC/***,the maximum remanent polarization(2Pr)of the ceramic is 3.08C/cm^(2) with the coercive field of 18.01 kV/*** dielectric constant and dielectric loss for Na_(0.5)Bi_(4.5)Ti_(3.96)Mg_(0.04)–BT composite ceramic were found to be 486 and 0.17 at 10 kHz,*** characteristic peaks of BT and Na_(0.5)Bi_(4.5)Ti_(4)O_(15) can be observed clearly from the X-ray diffraction *** analysis showed that all samples were well ***,the piezoelectric and ferroelectric properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)–BT composite ceramic will be enhanced much by Mg doping,which means it has a wider range of applications in electronic devices such as piezoelectric devices.

关键词： Na_(0.5)Bi_(4.5)Ti_(4)O_(15) piezoelectric ceramics ferroelectric properties

DIELECTRIC AND ferroelectric properties OF(1-x)Pb(Mg_(1/3)Nb_(2/3))O_(3)-xPbZrO_(3)CERAMICS WITH CATION ORDER

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Journal of Advanced Dielectrics 2011年第1期1卷 99-106页

作者： XIAOHUI ZHAO XIAOLI TAN State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 P.R.China Department of Materials Science and Engineering Iowa State University AmesIA 50011USA

Electrical properties and the B-site cation order were investigated in the(1-x)Pb(Mg_(1/3)Nb_(2/3))O_(3)-xPbZrO_(3)(0≤x≤0.25)solid solution *** was found that long range 1.1 B-site cation order can be developed through slow cooling during sintering in the solid solution with compositions around x=*** observed long range cation order is in sharp contrast to previous studies where a disordered structure was invariably resulted in the(1-x)PbeMg_(1/3)Nb_(2/3)TO_(3)-xPbZrO_(3)solid *** ceramics with cation order display dielectric and ferroelectric properties similar to those disordered ceramics reported in *** dielectric properties were also compared in detail to our previous PbeMg_(1/3)Zr_(2x/3)Nb_(2)(1-x)/3TO_(3-x)/3 ceramics where Zr^(4+)is designed to substitute Nb^(5+)*** results were discussed on the basis of the relationships between cation order and electric dipole order.

关键词： Lead magnesium niobate cation order lead zirconate ferroelectric properties

Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate piezoelectric ceramics

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Journal of Advanced Dielectrics 2021年第3期11卷 8-15页

作者： J.A.Cortés J.Camargo M.F.Rachia F.Rubio-Marcos L.Ramajo M.Castro M.A.Ramírez Sao Paulo State University—UNESP Faculty of Engineering of Guaratingueta.Av.Dr.Ariberto Pereira da Cunha 333 Portal das Colinas 12516-410GuaratinguetaSPBrazil Research Institute for Materials Science and Technology INTEMA Av.Colon 10850B7608FDQ Mar del PlataArgentina Electroceramics Department Instituto de Cerámica y Vidrio CSICKelsen 528049MadridSpain Escuela Politécnica Superior.Universidad Antonio de Nebrija Pirineos 55 28040MadridSpain

The effect of sintering condition on structure,microstructure,and ferroelectric properties of(K_(0.44)Na_(0.52)Li_(0.04))(Nb_(0.86)Ta_(0.10)Sb_(0.04))-O_(3)(KNL-NTS)has been *** powders have been synthesized by the solid-state reaction method and sintered at different temperatures(1115℃,1125℃,and 1140℃).Then,samples were characterized by thermogravimetric analysis,X-ray diffraction,scanning electron microscopy,and impedance *** XRD results,the perovskite structure and small peaks corresponding to a secondary phase were *** processed at the highest temperatures showed higher densities and good piezoelectric properties(d_(33),K_(p),and K_(t)),particularly specimens sintered at 1125℃ presented the highest piezoelectric performance.

关键词： KNL-NTS lead-free ferroelectric properties