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Dielectric properties and phase transitions of La_2O_3- and Sb_2O_3-doped barium strontium titanate ceramics 被引量:4
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作者 张晨 曲远方 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2742-2748,共7页
The dielectric properties and phase transition characteristics of La2O3- and Sb2O3-doped barium strontium titanate ceramics prepared by solid state route were investigated. The microstructure was identified by X-ray d... The dielectric properties and phase transition characteristics of La2O3- and Sb2O3-doped barium strontium titanate ceramics prepared by solid state route were investigated. The microstructure was identified by X-ray diffraction method and scanning electron microscope was also employed to observe the surface morphologies. It is found that (La,Sb)-codoped barium strontium titanate ceramics exhibit typical perovskite structure and the average grain size decreases dramatically with increasing the content of Sb2O3. Both La3+ ions and Sb3+ ions occupy the A-sites in perovskite lattice. The dielectric constant and dielectric loss of barium strontium titanate based ceramics are obviously influenced by La2O3 as well as Sb2O3 addition content. The tetragonal-cubic phase transition of La2O3 modified barium strontium titanate ceramics is of second order and the Curie temperature shifts to lower value with increasing the La2O3 doping content. The phase transition of (La,Sb)-codoped barium strontium titanate ceramics diffuses and the deviation from Curie-Weiss law becomes more obvious with the increase in Sb2O3 concentration. The temperature corresponding to the dielectric constant maximum of (La,Sb)-codoped barium strontium titanate ceramics decreases with increasing the Sb2O3 content, which is attributed to the replacement of host ions by the Sb3+ ions. 展开更多
关键词 barium strontium titanate LA2O3 SB2O3 PEROVSKITE CERAMICS dielectric properties phase transition
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Dielectric properties and point defect behavior of antimony oxide doped Ti deficient barium strontium titanate ceramics 被引量:1
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作者 Chen ZHANG Zhi-xin LING +1 位作者 Gang JIAN Fang-xu CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第12期2656-2662,共7页
The microstructures and dielectric properties of Sb2O3-doped Ti deficient barium strontium titanate ceramics prepared by solid state method were investigated with non-stoichiometric level and Sb2O3content by SEM,XRD a... The microstructures and dielectric properties of Sb2O3-doped Ti deficient barium strontium titanate ceramics prepared by solid state method were investigated with non-stoichiometric level and Sb2O3content by SEM,XRD and LCR measure system.It is found that with the increase ofδ,(Ba0.75Sr0.25)Ti1-δO3-2δceramics transform from single phase solid solutions with typical cubic perovskite structure to multiphase compounds while(Ba0.75Sr0.25)Ti0.998O2.996ceramics remain to be single-phase with the increasing Sb2O3content.The distortion of the ABO3perovskite lattice caused by VTi″″and VO..induces the drop of Curie temperature and the rise of relative dielectric constant in(Ba0.75Sr0.25)Ti1-δO3-2δceramics with increasingδvalue.The orientation of VO??elastic dipoles results in the domain-wall pinning and thus the reduction of the dielectric loss.With increasing Sb2O3content,the relative dielectric constant,dielectric constant maximum and Curie temperature of(Ba0.75Sr0.25)Ti0.998O2.996ceramics decrease dramatically while the dielectric loss increases. 展开更多
关键词 barium strontium titanate DEFECTS dielectric properties non-stoichiometric ceramics
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Preparation and characterization of barium strontium titanate/silicon nanoporous pillar array composite thin films by a sol-gel method
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作者 Shun-hua Xiao Wei-fen Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第8期762-767,共6页
Barium strontium titanate (Ba0.5Sr0.5TiO3, BST)/silicon nanoporous pillar array (Si-NPA) thin films were prepared by a spin-coating/annealing technique based on Si-NPA with micro/nano-structure. Both the isomer co... Barium strontium titanate (Ba0.5Sr0.5TiO3, BST)/silicon nanoporous pillar array (Si-NPA) thin films were prepared by a spin-coating/annealing technique based on Si-NPA with micro/nano-structure. Both the isomer conversion of acetylacetone and the network structure combined by enol and Ti-alkoxide facilitate the formation of the BST sol and the subsequent crystallization. Before the perovskite BST begins to form, the intermediate phase (Ba, Sr)Ti2OsCO3 is found. The boundary between BST and Si-NPA is of clarity and little interface diffusion, disclosing that Si-NPA is an ideal template substrate in the preparation of multifunctional composite films. 展开更多
关键词 barium strontium titanate SILICON nanoporous materials composite films sol-gel process
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Synthesis and characterization of highly-ordered barium-strontium titanate nanotube arrays fabricated by sol-gel method
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作者 陈煜 程伟 +3 位作者 郭峰 李美亚 刘威 赵兴中 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第9期3922-3927,共6页
Highly uniformed barium-strontium titanate nanotube arrays were fabricated using a porous anodic aluminum oxide template from a barium-strontium titanate sol-gel solution. Electron microscope results showed that nanot... Highly uniformed barium-strontium titanate nanotube arrays were fabricated using a porous anodic aluminum oxide template from a barium-strontium titanate sol-gel solution. Electron microscope results showed that nanotubes with uniform length and diameter were obtained. The diameters and lengths of these nanotubes were dependent on the pore diameter and the thickness of the applied anodic aluminum oxide template. High resolution transmission electron microscopy and the selected-area electron diffraction pattern investigations demonstrated the perovskite structure and the polycrystalline of the fabricated barium-strontium titanate nanotubes. The characterization of the electrical and dielectric properties had also been made. Compared to thin film material, the intrinsic leakage current density is almost the same. Besides, at 30 ℃ the dielectric constant and dielectric loss of the fabricated nanotube is 80 and 0.027 at 1 MHz respectively. 展开更多
关键词 NANOTUBES barium-strontium titanate SOL-GEL
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An Investigation of PLD-Deposited Barium Strontium Titanate (Ba<sub>x</sub>Sr<sub>1-x</sub>TiO<sub>3</sub>) Thin Film Optical Properties
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作者 Martin Kocanda Syed Farhan Mohiudin Ibrahim Abdel-Motaleb 《Crystal Structure Theory and Applications》 2012年第2期17-20,共4页
Reflectance and transmittance parameters of pulsed laser deposited barium strontium titanate (BST) were investigated using spectrophotometric methods. Three stoichiometries consisting of BaxSr1-xTiO3 (x = 0.30, 0.40, ... Reflectance and transmittance parameters of pulsed laser deposited barium strontium titanate (BST) were investigated using spectrophotometric methods. Three stoichiometries consisting of BaxSr1-xTiO3 (x = 0.30, 0.40, 0.50) were deposited on glass substrates using oxygen partial pressures of 1.3 Pa ± 0.13 Pa at 500oC. Subsequently, the measured optical parameters were employed to determine the refractive index (n), extinction coefficient (k), optical conductivity (σ), absorption coefficient (α) and optical bandgap (Eg) using swept spectra in the ultraviolet, visible and near-infrared range (200 nm - 1100 nm) as these have not been reported in the literature. The calculated parameters for Ba0.4Sr0.6TiO3 are reported in this experimental work. Minimal differences in the transmittance have been observed at the visible band edges when comparing each stoichiometry. Sharp cutoffs were observed at the bands edges and strong absorbance in the 200 nm - 300 nm band as attributed to the crystal structure based upon the oxygen partial pressure during the deposition process. 展开更多
关键词 barium strontium titanate OPTICAL Bandgap OPTICAL Conductivity Pulsed Laser Deposition STOICHIOMETRY
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Glass modified barium strontium titanate ceramics for energy storage capacitor at elevated temperatures 被引量:11
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作者 Zong-Yang Shen Yu Wang +6 位作者 Yanxue Tang Yuanying Yu Wen-Qin Luo Xingcai Wang Yueming Li Zhumei Wang Fusheng Song 《Journal of Materiomics》 SCIE EI 2019年第4期641-648,共8页
A glass with composition of B_(2)O_(3)-Bi_(2)O_(3)-SiO_(2)-CaO-BaO-Al_(2)O_(3)-ZrO_(2)(BBSZ)modified Ba_(x)Sr_(1-x)TiO_(3)(BST,x=0.3 and 0.4)ceramics were prepared by a conventional solid state reaction method abided ... A glass with composition of B_(2)O_(3)-Bi_(2)O_(3)-SiO_(2)-CaO-BaO-Al_(2)O_(3)-ZrO_(2)(BBSZ)modified Ba_(x)Sr_(1-x)TiO_(3)(BST,x=0.3 and 0.4)ceramics were prepared by a conventional solid state reaction method abided by a formula of BST+y%BBSZ(y=0,2,4,7,and 10,in mass).The effect of BBSZ glass content on the structure,dielectric properties and energy storage characteristics of the ceramics was investigated.The dielectric constant reduced but the endurable electrical strength enhanced due to the BBSZ glass addition in BST ceramics.In particular,the dielectric loss of the ceramics at elevated temperature(e.g.200℃)can be strongly suppressed from tanδ>20%to tanδ<3% after BBSZ glass modification.For Ba_(0.3)Sr_(0.7)TiO_(3)+2%BBSZ ceramics,an optimized energy storage density(γ=0.63 J/cm^(3))and efficiency(η=91.6%)under an applied electric field of 160 kV/cm was obtained at room temperature.Meanwhile,the temperature dependent polarization-electric field(P-E)hysteresis loops were measured to evaluate the energy storage characteristics of the ceramics potential for high voltage capacitor application at elevated temperatures. 展开更多
关键词 barium strontium titanate Glass modification Energy storage Ceramic capacitor
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Sol-gel derived nanocrystalline and mesoporous barium strontium titanate prepared at room temperature 被引量:5
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作者 Mohammad Reza Mohammadi Derek J.Fray 《Particuology》 SCIE EI CAS CSCD 2011年第3期235-242,共8页
Perovskite-type barium strontium titanate (BST) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol-gel route at room temperature. The prepared sol... Perovskite-type barium strontium titanate (BST) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol-gel route at room temperature. The prepared sol had a narrow particle size distribution of about 20 nm. X-ray diffraction (XRD) revealed that phase composition and preferable orientation growth of BST depended upon the annealing temperature. Transmission electron microscope (TEM) images showed that the crystallite size of the powders decreased with increasing annealing temperature from 8 nm at 25 ℃ down to 5 nm at 800 ℃. Field emission scanning electron microscope (FE-SEM) analysis and atomic force microscope (AFM) images revealed that BST thin films had mesoporous and nanocrystafiine structure with average grain size of 3Onm at 600 ℃. Based on Brunauer-Emmett-Teller (BET) analysis, the synthesized BST showed mesoporous structure containing nnres with needle, and nlate shanes and BET surface area in the range of 49-32 m^2/g at 500-800℃ 展开更多
关键词 barium strontium titanate Room temperature Sol-gel chemistry Nanostructure
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Etching mechanism of barium strontium titanate (BST) thin films in CHF_3/Ar plasma
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作者 DAI LiPing WANG ShuYa SHU Ping ZHONG ZhiQin WANG Gang ZHANG GuoJun 《Chinese Science Bulletin》 SCIE EI CAS 2011年第21期2267-2271,共5页
Reactive ion etching was used to etch barium strontium titanate thin films in a CHF3/Ar plasma.BST surfaces before and after etching were analyzed by X-ray photoelectron spectroscopy to investigate the reaction ion et... Reactive ion etching was used to etch barium strontium titanate thin films in a CHF3/Ar plasma.BST surfaces before and after etching were analyzed by X-ray photoelectron spectroscopy to investigate the reaction ion etching mechanism,and chemical reactions had occurred between the F plasma and the Ba,Sr and Ti metal species.Fluorides of these metals were formed and remained on the surface during the etching process.Ti was almost completely removed because the TiF4 by-product is volatile.Minor quantities of Ti?F could still be detected by narrow scan X-ray photoelectron spectra,and Ti?F was thought to be present in the form of a metal-oxy-fluoride.These species were investigated from O1s spectra,and a fluoride-rich surface was formed during etching.BaF2 and SrF2 residues were difficult to remove because of their high boiling point.The etching rate was limited to 12.86 nm/min.C?F polymers were not found on the surface,indicating that the removal of BaF2 and SrF2 was important for further etching.A 1-min Ar/15 plasma physical sputtering was carried out for every 4 min of surface etching,which effectively removed remaining surface residue.Sequential chemical reaction and sputtered etching is an effective etching method for barium strontium titanate films. 展开更多
关键词 钛酸锶钡薄膜 等离子蚀刻 BST 机制 X射线光电子能谱 反应离子刻蚀 BAF2晶体 金属氟化物
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超重力⁃水热法制备形貌可控的钛酸锶钡粉体
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作者 马瑶 袁志国 +4 位作者 李宇龙 付艺婷 张雅倩 贾正娜 孔哲 《中北大学学报(自然科学版)》 CAS 2024年第5期647-653,共7页
零维和多维结构的钛酸锶钡(Ba_(1-x)Sr_(x)TiO_(3),BST)粉体分别具有高比表面积和高长径比的优势,为提升材料性能并扩大电子元件中原材料的工业化应用,改善粉体制备过程中分布不均、耗时长的问题,采用撞击流-旋转填料床(IS-RPB)结合水... 零维和多维结构的钛酸锶钡(Ba_(1-x)Sr_(x)TiO_(3),BST)粉体分别具有高比表面积和高长径比的优势,为提升材料性能并扩大电子元件中原材料的工业化应用,改善粉体制备过程中分布不均、耗时长的问题,采用撞击流-旋转填料床(IS-RPB)结合水热法制备了添加丙三醇的BST粉体,考察了水热温度、水热时间及丙三醇添加量等因素对BST粉体形貌的影响规律。结合X-射线衍射仪(XRD)、扫描电子显微镜(SEM)以及透射电子显微镜(TEM)对BST粉体的形貌、晶相及组成进行了表征分析。结果表明:在超重力因子为40、撞击初速度10.61m/s、水热温度180℃、水热时间12h的条件下,当添加少量丙三醇时,其充当分散剂的作用,所制得的BST粉体为均匀性与分散性良好的纳米球形颗粒;当添加较多丙三醇时,其充当溶剂的作用,在水热条件下沿单元晶面生长得到了片状及花状形貌。本文提出的超重力-水热法及丙三醇的添加对于工业化形貌可控制备BST粉体探索提供了一种方便快捷的途径。 展开更多
关键词 水热法 撞击流-旋转填料床 钛酸锶钡 丙三醇 形貌调控
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MgNb_(2)O_(6)掺杂(Ba,Sr)TiO_(3)基电容器陶瓷介电性能的研究
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作者 陈映义 陈磊 +4 位作者 彭道华 陈甲天 陈应和 黄新友 牛继恩 《压电与声光》 CAS 北大核心 2024年第5期704-709,共6页
采用固相法制备MgNb_(2)O_(6)(MNO)掺杂(Ba_(0.79)Sr_(0.21))TiO_(3)((Ba,Sr)TiO_(3))基电容器陶瓷。采用XRD、SEM等研究了MgNb_(2)O_(6)掺杂对(Ba,Sr)TiO_(3)基电容器陶瓷的物相、显微结构及介电性能影响。结果表明,随着MNO掺杂量的增... 采用固相法制备MgNb_(2)O_(6)(MNO)掺杂(Ba_(0.79)Sr_(0.21))TiO_(3)((Ba,Sr)TiO_(3))基电容器陶瓷。采用XRD、SEM等研究了MgNb_(2)O_(6)掺杂对(Ba,Sr)TiO_(3)基电容器陶瓷的物相、显微结构及介电性能影响。结果表明,随着MNO掺杂量的增加,(Ba,Sr)TiO_(3)基电容器陶瓷的介电常数逐渐减小,陶瓷的介电损耗先增大后减小再增大,陶瓷的电阻率先减小后增大再减小,陶瓷的耐压强度先减小后增大再减小。当MNO掺杂量(质量分数)为2.0%时,陶瓷的介电常数达到最大值(为1670),陶瓷的介电损耗有最小值(为0.0056)。当MNO掺杂量(质量分数)为8%时,陶瓷的电阻率有最大值(为65.23×10^(10)Ω·cm),耐压强度的最大值为7.7 kV/mm(DC)。当掺杂MNO量(质量分数)为10%时,陶瓷的电容温度变化率为+0.18%,-28.29%。MNO掺杂(Ba,Sr)TiO_(3)基电容器陶瓷是钙钛矿结构。掺杂MNO能够降低陶瓷的电容温度变化率。 展开更多
关键词 钛酸锶钡 MgNb_(2)O_(6) 介电性能 掺杂 陶瓷
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Bi_(2)(SnO_(3))3掺杂(Ba,Sr)TiO_(3)介电陶瓷介电性能的研究
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作者 陈映义 陈磊 +4 位作者 彭道华 陈甲天 陈应和 黄新友 牛继恩 《中国陶瓷》 CAS CSCD 北大核心 2024年第6期49-54,共6页
通过传统固相法制备Bi_(2)(SnO_(3))_(3)(BSO)掺杂(Ba_(0.79)Sr_(0.21))TiO_(3)((Ba,Sr)TiO_(3),BST)陶瓷。采用XRD、SEM等研究了Bi_(2)(SnO_(3))_(3)(BSO)掺杂对BST陶瓷的物相和微观结构及介电的性能影响。实验结果表明:随着BSO掺杂量... 通过传统固相法制备Bi_(2)(SnO_(3))_(3)(BSO)掺杂(Ba_(0.79)Sr_(0.21))TiO_(3)((Ba,Sr)TiO_(3),BST)陶瓷。采用XRD、SEM等研究了Bi_(2)(SnO_(3))_(3)(BSO)掺杂对BST陶瓷的物相和微观结构及介电的性能影响。实验结果表明:随着BSO掺杂量增加,BST基介电陶瓷的介电常数开始增大而后减小然后再增大随后再减小,陶瓷的介质损耗首先增大然后减小。当掺杂BSO的量是2 wt%的时候,BST基介电陶瓷具有较好的介电性能:介电常数是5430;介质损耗是0.0145,电容温度变化率是+20.64%,-45.58%。BSO掺杂的BST基介电陶瓷仍为钙钛矿结构。BSO的掺杂起到移峰和压峰的作用。 展开更多
关键词 钛酸锶钡 Bi_(2)(SnO_(3))_(3) 介电性能 掺杂 陶瓷
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化妆品用钛白粉的溶胶凝胶合成及其性能研究
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作者 马虹 王艳 《日用化学工业(中英文)》 CAS 北大核心 2024年第5期574-580,共7页
采用溶胶凝胶法合成了钛白粉、钛酸锶和钛酸钡3种防晒剂。晶体结构表征表明钛白粉为四方晶系的金红石相的TiO_(2),空间群为P42/mnm(136);钛酸锶为立方晶系,空间群为Pm-3m(221);钛酸钡为四方晶系,空间群为P4/mmm(123)。官能团信息表征发... 采用溶胶凝胶法合成了钛白粉、钛酸锶和钛酸钡3种防晒剂。晶体结构表征表明钛白粉为四方晶系的金红石相的TiO_(2),空间群为P42/mnm(136);钛酸锶为立方晶系,空间群为Pm-3m(221);钛酸钡为四方晶系,空间群为P4/mmm(123)。官能团信息表征发现,钛白粉和钛酸钡为纯相,而钛酸锶中含有少量C-O官能团。SEM和TEM观察发现,钛白粉、钛酸锶和钛酸钡的颗粒均近似呈球形,平均颗粒尺寸分别为30,40和60 nm。光学性质表征表明,3种防晒剂均具有高的紫外光吸收系数,且钛白粉的光学吸收系数可拓展到400 nm范围。经计算可知,钛白粉、钛酸锶和钛酸钡的光学带隙值分别为3.03,3.27和3.25 eV。钛白粉具有宽的紫外光吸收能力且颗粒分布均匀,颜色为白色,可潜在应用于各种香料、防晒霜、皂片、白色香皂和牙膏中。 展开更多
关键词 钛白粉 钛酸锶 钛酸钡 防晒剂
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非水解溶胶-凝胶法合成Ba_(1-x)Sr_(x)TiO_(3)粉体的研究
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作者 江峰 张俊雄 +6 位作者 张戎驰 李文 尹丽 韦土月 罗统斌 冯果 刘健敏 《中国陶瓷》 CAS CSCD 北大核心 2024年第5期13-20,共8页
以乙酸钡为钡源、乙酸锶为锶源、钛酸丁酯为钛源、丙三醇为溶剂,通过非水解溶胶-凝胶法合成Ba_(1-x)Sr_(x)TiO_(3)粉体。借用XRD、SEM等测试手段,系统探讨了Ba∶Sr∶Ti比对Ba_(1-x)Sr_(x)TiO_(3)粉体合成的影响,并研究了Ba_(0.6)Sr_(0.4... 以乙酸钡为钡源、乙酸锶为锶源、钛酸丁酯为钛源、丙三醇为溶剂,通过非水解溶胶-凝胶法合成Ba_(1-x)Sr_(x)TiO_(3)粉体。借用XRD、SEM等测试手段,系统探讨了Ba∶Sr∶Ti比对Ba_(1-x)Sr_(x)TiO_(3)粉体合成的影响,并研究了Ba_(0.6)Sr_(0.4)TiO_(3)粉体的烧结性能。结果表明:当Ba∶Sr∶Ti比分别为0.5∶0.5∶1.2、0.6∶0.4∶1.2、0.7∶0.3∶1.3和0.8∶0.2∶1.4时,可制得Ba_(0.5)Sr_(0.5)TiO_(3)、Ba_(0.6)Sr_(0.4)TiO_(3)、Ba_(0.7)Sr_(0.3)TiO_(3)、Ba_(0.8)Sr_(0.2)TiO_(3)的纯相粉体。随着锶含量的逐渐减少,Ba_(1-x)Sr_(x)TiO_(3)的衍射峰强度是逐渐减弱的,表明锶的取代降低了Ba_(1-x)Sr_(x)TiO_(3)的结晶度。根据XRD精修结果,发现Ba_(1-x)Sr_(x)TiO_(3)粉体中随着锶含量的增多,晶格常数和晶胞体积均减少,Ba-O键和Ti-O键键长也均减少。优选添加分散剂吐温60改善了粉体的分散性,获得了一次粒径约为50 nm,D_(50)为0.366μm的钛酸锶钡超细粉体。 展开更多
关键词 钛酸锶钡 粉体 分散 非水解溶胶-凝胶法
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钛酸锶钡的制备及光催化研究进展
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作者 陈佳阔 王晓宇 +4 位作者 王仟禧龙 彭俊淇 王建省 赵英娜 曾雄丰 《陶瓷学报》 CAS 北大核心 2024年第4期658-669,共12页
钛酸锶钡(BST)作为一种半导体材料可被应用于光催化领域,但其对可见光的响应率低且光生载流子易复合,需要通过不同方法进行改性。BST是具有压电效应的半导体,可以通过其自身的压电效应形成的内建电场来提高光生载流子的分离效率,进而提... 钛酸锶钡(BST)作为一种半导体材料可被应用于光催化领域,但其对可见光的响应率低且光生载流子易复合,需要通过不同方法进行改性。BST是具有压电效应的半导体,可以通过其自身的压电效应形成的内建电场来提高光生载流子的分离效率,进而提升自身的光催化性能。通过光压协同、调控组成、元素掺杂等方法改性后,BST可被应用在光催化分解水制氢、降解污染物等领域。通过梳理学者在BST方面的研究成果,总结概述了BST的制备过程、压电光催化的机理以及BST在光催化领域的研究进展。 展开更多
关键词 钛酸锶钡 光催化 压电效应
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La、Cr掺杂对钛酸锶钡陶瓷调谐性能的影响 被引量:1
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作者 赵毅 刘文凤 +2 位作者 靳一航 戚润生 李盛涛 《西安交通大学学报》 EI CAS CSCD 北大核心 2023年第11期151-159,共9页
针对可调谐微波器件对材料高介电可调性与低介电损耗的性能需求,采用传统固相烧结法,设计并制备了具有优异调谐性能的施受主复合掺杂(Ba_(0.675) Sr_(0.325))1-0.005 La 0.005 Ti_(1-x) Cr_(x)O_(3)(x=0.3%、0.5%、0.7%、1.0%)陶瓷。引... 针对可调谐微波器件对材料高介电可调性与低介电损耗的性能需求,采用传统固相烧结法,设计并制备了具有优异调谐性能的施受主复合掺杂(Ba_(0.675) Sr_(0.325))1-0.005 La 0.005 Ti_(1-x) Cr_(x)O_(3)(x=0.3%、0.5%、0.7%、1.0%)陶瓷。引入施主杂质La取代A位元素改善介电可调性,受主杂质Cr取代B位元素降低介电损耗,并改变施主/受主掺杂比,研究了施主/受主掺杂比对钛酸锶钡(BST)陶瓷微观结构与电学性能的影响规律。实验结果表明:随着受主杂质摩尔分数的增加,晶粒尺寸先增大后减小,致密度先提升后降低,即合适的施主/受主掺杂比更有利于试样的致密化;当Cr 3+的摩尔分数为0.7%时,试样的调谐性能最佳,其介电可调性为83.6%,介电损耗为0.0041,优值因子可达到204,此时,试样的击穿场强达到14 kV/mm。研究结果可为材料在强外加电场下使用稳定性提供参考。 展开更多
关键词 钛酸锶钡陶瓷 复合掺杂比 调谐性能 优值因子
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Ba_(0.6)Sr_(0.4)TiO_(3)纳米纤维对聚合物基复合材料储能密度的影响 被引量:1
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作者 亢金腾 王卓 +5 位作者 易志辉 李妍欣 吴丹 薛颖 叶荣辉 赵婷 《陕西科技大学学报》 北大核心 2023年第3期111-116,共6页
采用溶胶-凝胶结合静电纺丝法制备钛酸锶钡纳米纤维(Ba_(0.6)Sr_(0.4)TiO_(3)NFs, BST NFs)前驱体,对BST NFs前驱体进行750℃、800℃、850℃和900℃煅烧,结合XRD和SEM观察了煅烧后得到的BST NFs的晶体结构和形貌,选出相对较优的煅烧温度... 采用溶胶-凝胶结合静电纺丝法制备钛酸锶钡纳米纤维(Ba_(0.6)Sr_(0.4)TiO_(3)NFs, BST NFs)前驱体,对BST NFs前驱体进行750℃、800℃、850℃和900℃煅烧,结合XRD和SEM观察了煅烧后得到的BST NFs的晶体结构和形貌,选出相对较优的煅烧温度.采用溶液流延法制备BST NFs/PVDF复合薄膜,探究不同含量钛酸锶钡纳米纤维对复合材料的介电性能和储能性能影响.通过铁电测试,0.5 vol.%BST NFs/PVDF复合薄膜在电场强度为250 kV/mm下储能密度达到了3.94 J/cm^(3),是纯PVDF薄膜的1.5倍. 展开更多
关键词 聚偏氟乙烯(PVDF) 钛酸锶钡 储能密度 复合材料 静电纺丝
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掺杂改性增强钛酸锶钡薄膜介电性能的研究进展 被引量:1
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作者 汤健 刘军 傅志鹏 《化工新型材料》 CAS CSCD 北大核心 2023年第S02期71-75,79,共6页
钛酸锶钡(Ba_(x)Sr_(1-x)TiO_(3),BST)薄膜具备高介电常数、低介电损耗,以及高介电可调谐性等优点,是微波可调谐应用的潜在候选材料。综述了掺杂改性BST薄膜的研究进展,分别对A位掺杂、B位掺杂和双位共掺杂改性进行了总结和分析,对不同... 钛酸锶钡(Ba_(x)Sr_(1-x)TiO_(3),BST)薄膜具备高介电常数、低介电损耗,以及高介电可调谐性等优点,是微波可调谐应用的潜在候选材料。综述了掺杂改性BST薄膜的研究进展,分别对A位掺杂、B位掺杂和双位共掺杂改性进行了总结和分析,对不同位置掺杂改性的BST薄膜的介电性能进行了对比分析;众多研究显示,单独的A位或B位掺杂修饰并不能获得介电性能均衡增强的BST薄膜,而双位共掺杂则可以使BST薄膜的介电性能得到均衡增强。 展开更多
关键词 钛酸锶钡 掺杂 介电性能
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A位稀土离子La^(3+)掺杂BNBST弛豫铁电陶瓷的储能特性增强研究 被引量:2
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作者 邓伟 李昊 +3 位作者 李志鹏 沈宗洋 骆雯琴 宋福生 《中国陶瓷》 CAS CSCD 北大核心 2023年第9期20-27,共8页
在A位稀土离子La^(3+)掺杂BNBST中设计Sr^(2+)空位进行电荷补偿,采用传统固相法制备了Bi_(0.3)Na_(0.3)Ba_(0.12)Sr_(0.28-1.5x)□_(0.5x)La_(x)TiO_(3)陶瓷(缩写为BNBSLxT,x=0、0.01、0.03、0.05、0.07),研究了不同La^(3+)离子掺杂量... 在A位稀土离子La^(3+)掺杂BNBST中设计Sr^(2+)空位进行电荷补偿,采用传统固相法制备了Bi_(0.3)Na_(0.3)Ba_(0.12)Sr_(0.28-1.5x)□_(0.5x)La_(x)TiO_(3)陶瓷(缩写为BNBSLxT,x=0、0.01、0.03、0.05、0.07),研究了不同La^(3+)离子掺杂量对陶瓷相结构、微观结构、介电性能及储能特性的影响。结果表明:所有陶瓷均为单一钙钛矿结构,La^(3+)掺杂可细化晶粒。随着La^(3+)掺杂量增加,陶瓷的剩余极化值大幅度降低,电滞回线从“宽胖型”转变为“细长型”,显著增强了储能特性。BNBSL0.05T陶瓷具有高介电常数ε_(r)(>2000@1 kHz)和低介电损耗tanδ(<10^(-2)@1kHz),在95 kV/cm电场下的储能密度和效率分别为W_(rec)=1.56 J/cm^(3)和η=85.88%,同时具有良好的温度、频率和循环稳定性,可作为低电场下高储能密度脉冲功率陶瓷电容器的候选材料。 展开更多
关键词 储能陶瓷 钛酸铋钠 钛酸锶钡 弛豫铁电 稀土掺杂
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双形貌前驱体制备钛酸锶钡介质陶瓷的结构及其介电性能
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作者 王保轩 许佳豪 +2 位作者 令翔宇 贝颂 刘贵山 《大连工业大学学报》 CAS 北大核心 2023年第1期53-58,共6页
利用溶胶-凝胶法制备钛酸锶钡(BST)静电纺丝前驱液,经过静电纺丝、煅烧等工艺得到均匀的钛酸锶钡纳米级无机纤维,使用模压法1300℃煅烧制备了纤维质量分数为10%、30%和50%的颗粒/纤维双形貌前驱体的陶瓷介质。通过XRD、EDS及SEM分析了... 利用溶胶-凝胶法制备钛酸锶钡(BST)静电纺丝前驱液,经过静电纺丝、煅烧等工艺得到均匀的钛酸锶钡纳米级无机纤维,使用模压法1300℃煅烧制备了纤维质量分数为10%、30%和50%的颗粒/纤维双形貌前驱体的陶瓷介质。通过XRD、EDS及SEM分析了钛酸锶钡颗粒/纤维前驱体和陶瓷介质的物相组成和微观形貌,采用自动元件分析仪测试钛酸锶钡陶瓷介质的介电性能。结果表明,纤维结构前驱体的存在可以改善陶瓷介质的微观结构,钛酸锶钡纤维前驱体结构蓬松,制备出的纯纤维前驱体介质陶瓷的致密性较差导致介电常数至少降低50%、介电损耗增加0~3,适量的钛酸锶钡无机纤维前驱体结构将陶瓷介质的介电常数提高500~2000。 展开更多
关键词 钛酸锶钡 静电纺丝 微观形貌 介电性能
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Y_(2)O_(3)掺杂对钛酸锶钡陶瓷材料介电-温度及电阻率-温度特性的影响
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作者 周远翔 杨达 +3 位作者 姜贵敏 滕陈源 张云霄 姚彤 《高电压技术》 EI CAS CSCD 北大核心 2023年第11期4686-4694,共9页
钛酸钡基电介质陶瓷因具有良好的介电和正温度系数特性已被广泛应用于科技、工业以及日常生活中,在新兴领域的需求下,开发具有低居里温度和高常温电阻率特性的电介质陶瓷材料具有重要意义。因此,采用固相法制备了不同掺杂浓度氧化钇(Y_(... 钛酸钡基电介质陶瓷因具有良好的介电和正温度系数特性已被广泛应用于科技、工业以及日常生活中,在新兴领域的需求下,开发具有低居里温度和高常温电阻率特性的电介质陶瓷材料具有重要意义。因此,采用固相法制备了不同掺杂浓度氧化钇(Y_(2)O_(3))的钛酸锶钡(Ba_(0.7)Sr_(0.3)TiO_(3),BST),正温度系数(positive temperature coefficient,PTC)陶瓷材料,通过X射线衍射和扫描电镜测试了试样的理化特性,利用宽频介电谱仪和电阻率–温度测量系统分别获得了试样的介电–温度特性和电阻率–温度特性,并构建了四象限模型分析钇(Y)对材料介电–温度特性和电阻率–温度特性的影响机理。研究表明:随Y_(2)O_(3)含量的增大,介电常数和居里温度均呈先增大后减小的趋势,而常温电阻率呈现相反的变化趋势。0.0008 mol的Y_(2)O_(3)掺杂可大幅提高BST材料相对介电常数(>105)且具有较低的居里温度(34.1℃)和较大的常温电阻率(5.6×106Ω·cm)。实现了低居里温度和高电阻率特性的协同调控,拓宽了PTC材料的应用范围。 展开更多
关键词 钛酸锶钡 居里温度 常温电阻率 介电–温度特性 电阻率–温度特性
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