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钐掺杂钛酸锶阳极催化材料的制备及其性能 被引量:4
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作者 黄永珍 程继贵 +1 位作者 董洁 夏永红 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2009年第A01期178-182,共5页
采用凝胶浇注法制得了Sr1-1.5xSmxTiO3(x=0~0.08)复合氧化物粉体,考察了Sm掺杂量、凝胶煅烧温度等对产物相组成、烧结性能及电导率等的影响。实验结果表明:干凝胶在1400℃煅烧形成了具有单一钙钛矿结构的Sr1-1.5xSmxTiO3复合氧化物粉... 采用凝胶浇注法制得了Sr1-1.5xSmxTiO3(x=0~0.08)复合氧化物粉体,考察了Sm掺杂量、凝胶煅烧温度等对产物相组成、烧结性能及电导率等的影响。实验结果表明:干凝胶在1400℃煅烧形成了具有单一钙钛矿结构的Sr1-1.5xSmxTiO3复合氧化物粉体。烧结温度对Sr1-1.5xSmxTiO3材料的烧结致密化有明显的影响。Sm的掺入,可以明显提高SrTiO3材料的电导率。在500~850℃内,Sr1-1.5xSmxTiO3烧结体的电导率随测试温度的升高而降低。掺入4mol%Sm的烧结体在800℃下的电导率为28.8S·cm–1。 展开更多
关键词 钐掺杂钛酸锶:凝胶浇注 相组成 烧结性能 电导率
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浸渍-沉积法制备一维Au/TiO_2的光催化性能研究 被引量:2
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作者 赵伟玲 朱宝林 +5 位作者 董建勋 宋娟娟 胡晓静 王淑荣 张守民 黄唯平 《材料导报》 EI CAS CSCD 北大核心 2012年第6期27-30,共4页
以钛酸纳米管为载体、HAuCl4为金前驱体,通过浸渍-沉积法制备一维金修饰TiO2光催化剂(Au/TiO2)。通过X射线衍射和紫外-可见漫反射吸收光谱研究材料的结构和性质。以甲基橙溶液作为模拟废液,研究Au/TiO2材料在紫外光条件下的光催化活性... 以钛酸纳米管为载体、HAuCl4为金前驱体,通过浸渍-沉积法制备一维金修饰TiO2光催化剂(Au/TiO2)。通过X射线衍射和紫外-可见漫反射吸收光谱研究材料的结构和性质。以甲基橙溶液作为模拟废液,研究Au/TiO2材料在紫外光条件下的光催化活性。研究表明,由于金可以接受电子,从而促进光生电子和光生空穴的分离,使TiO2的光催化活性提高;Au/TiO2的光催化活性还与金的含量密切相关,金的最佳负载量为1%(质量分数)。 展开更多
关键词 钛酸纳米管金浸渍沉积光催化
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全差示吸光光度法测定矿石中广泛含量钛
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作者 杨秋菊 孔繁茂 《山东陶瓷》 CAS 2000年第2期38-39,共2页
全差示吸光光度法精密度好(相对偏差可降至0.4%-0.2%以下),灵敏度高(比普通法可提高10~20倍),测定范围广(可以从痕量至高含量0.00X^99.X%),我们用此法采用过钛酸法测定广泛含量的钛。在选定的条件下测定微克~20mgTiO_2... 全差示吸光光度法精密度好(相对偏差可降至0.4%-0.2%以下),灵敏度高(比普通法可提高10~20倍),测定范围广(可以从痕量至高含量0.00X^99.X%),我们用此法采用过钛酸法测定广泛含量的钛。在选定的条件下测定微克~20mgTiO_2/100ml结果令人满意。 展开更多
关键词 广泛含量 全差示吸光光度 矿石 钛酸法
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水杨酸异丙酯的合成 被引量:1
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作者 雷宇 王石泉 张卫华 《湖北大学学报(自然科学版)》 CAS 2002年第4期335-337,346,共4页
综述了国内生产合成水杨酸异丙酯的工艺路线,以及一些新的催化合成方法,讨论了各工艺的优缺点.
关键词 水杨酸异丙酯 催化剂 合成工艺 钛酸丁酯催化 邻羟基苯甲酸异丙酯
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New method for measuring high field electrostrictive response of barium titanate/polyurethane elastomer
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作者 陈凡秀 丛羽奇 +2 位作者 林保平 李建清 何小元 《Journal of Southeast University(English Edition)》 EI CAS 2006年第1期88-92,共5页
A new method for measuring the characteristic of electrostriction by a digital speckle correlation method (DSCM) is presented. The in-plane displacement is obtained by using the DSCM, and the out-plane displacement ... A new method for measuring the characteristic of electrostriction by a digital speckle correlation method (DSCM) is presented. The in-plane displacement is obtained by using the DSCM, and the out-plane displacement is obtained by the geometrical relation of the triangle theory. In this application, high field electrostrictive strains of barium titanate/polyurethane elastomer composite materials are measured. The electrostrictive strain is evaluated when the application of an electric field is repeated, and then the electrostrictive coefficient of the sample is obtained. To improve the measuring accuracy, the bilinear interpolation of gray value is used to obtain the sub-pixel gray value. The results are compared with those obtained from the surface fitting algorithm. The experimental results demonstrate that the electrostrictive response of polyurethane increases with the introduction of barium titanate into polyurethane. And by using the DSCM, the measurement of the characteristic of electrostriction can be done quickly and accurately. The DSCM provides an effective tool for the evaluation of electrostrictive response. 展开更多
关键词 digital speckle correlation method electrostrictive response barium titanate/polyurethane elastomer composite material electrostrictive strain
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THE PREPARATION AND PHOTOCATALYTIC ABILITY OF LEAD TITANATE 被引量:1
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作者 戎谊梅 古风才 +2 位作者 王俊珍 单志兴 曾淑兰 《Transactions of Tianjin University》 EI CAS 1995年第1期62+59-62,共5页
he perovskite-type PbTiO3 has been synthesized by the method of mixed oxides. The appropriate conditions for preparing have been reported. The obtained PbTiO3 powder is pure and fine. The decolorization of dyes in a ... he perovskite-type PbTiO3 has been synthesized by the method of mixed oxides. The appropriate conditions for preparing have been reported. The obtained PbTiO3 powder is pure and fine. The decolorization of dyes in a PbTiO3 suspension system is over 90%. In this paper the photocatalytic ability of PbTiO3 and the factors of influence are discussed. 展开更多
关键词 lead titanate method of mixed oxides photocatalytic activity DECOLORIZATION
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Preparation and characterization of nanometer-sized barium titanate powder by complex-precursor method
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作者 石爱华 颜文斌 +1 位作者 李佑稷 黄可龙 《Journal of Central South University of Technology》 EI 2008年第3期334-338,共5页
A new complex-precursor method was proposed to prepare nanometer-sized BaTiO3 powder. Firstly,Ti2O(O2)2(ta)24-complex ions were prepared by the reaction of H2O2,Ti4+ and ta3-(ta=C6H6O6N3-) with a desirable amount of s... A new complex-precursor method was proposed to prepare nanometer-sized BaTiO3 powder. Firstly,Ti2O(O2)2(ta)24-complex ions were prepared by the reaction of H2O2,Ti4+ and ta3-(ta=C6H6O6N3-) with a desirable amount of surface active agent,and then the Ba2Ti2O(O2)2(ta)2·2H2O precursor was obtained by reaction between Ti2O(O2)2(ta)24-and Ba2+. Finally,the precursor was annealed at 800 ℃ for 2 h to obtain BaTiO3 powder. The morphology,the particle size distribution,the purity and the molar ratio of Ba to Ti of BaTiO3 powder were investigated systematically by TEM,XRD,IR,Raman and chemical analysis,respectively. The results show that the BaTiO3 powders with the grain size of about 40 nm have a tetragonal crystalline structure at room temperature and a spherical morphology. 展开更多
关键词 barium titanate complex-precursor method SYNTHESIS nanometer-sized powder
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Hydrothermal synthesis and dielectric properties of lanthanum titanate ceramics
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作者 邓元 南策文 《Journal of Central South University of Technology》 2005年第3期251-254,共4页
Lanthanum titanate (La2/3 TiO3) powders were synthesized by hydrothermal method based on the reaction of TiO2, La(NO3)3 and KOH at 160℃ for 24 h followed by the treatment of acidification. The microstructure, mor... Lanthanum titanate (La2/3 TiO3) powders were synthesized by hydrothermal method based on the reaction of TiO2, La(NO3)3 and KOH at 160℃ for 24 h followed by the treatment of acidification. The microstructure, morphology and dielectric properties were investigated by using X-ray diffraction, scanning electron microscope, transmission electron microscope and impedance method. The results show that the La2/3TiO3 particles consist of nearly homogenous and lamellar grains. The particles can be sintered into porous ceramics above 1150℃. The dielectric properties of La2/3 TiO3 show that both the dielectric constant and the dielectric loss tangent decrease with the increase of frequency. 展开更多
关键词 lanthanum titanate dielectric properties hydrothermal synthesis
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Detection Methods for MEMS-Based Xylophone Bar Magnetometer for Pico Satellites
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作者 Sylvain Ranvier Veronique Rochus +3 位作者 Sylvain Druart Herve Lamy Pierre Rochus Laurent A. Francis 《Journal of Mechanics Engineering and Automation》 2011年第5期342-350,共9页
Initially studied and developed by students in universities, the very small pico satellites (with a mass lower than 1 kg) are more and more considered for science applications. In particular, there are plans to use ... Initially studied and developed by students in universities, the very small pico satellites (with a mass lower than 1 kg) are more and more considered for science applications. In particular, there are plans to use them in constellations of small spacecraft for remote sensing of various regions of the magnetosphere. They require a payload with specific size, weight and power consumption. In order to respond to this demand, new instruments have to be developed. Those instruments should exhibit at least the same performances as those used in larger satellites while fulfilling the specific requirements imposed by the satellites size. For this reason, the authors currently develop a xylophone bar magnetometer (XBM) based on micro-electromechanical systems (MEMS) with integrated detector electronics. The principle of this magnetometer is based on a classical resonating xylophone bar. A sinnsoidal current oscillating at the fundamental bending resonant frequency of the bar is applied through the device, and when an external magnetic field is present, the resulting Lorentz force yields the bar to vibrate at its fundamental mode with a displacement directly proportional to the amplitude in one direction of the ambient magnetic field. When designing a MEMS XBM, the detection method is a crucial aspect. The measurement method largely influences the geometry of the magnetometer as well as the manufacturing technology. Due to the constraints in terms of size, weight and power consumption, the two most promising measurement methods are capacitive and piezoelectric ones. Several designs including these measurement techniques are presented and simulated under realistic conditions. First, designs including lateral electrodes for capacitive measurement are tackled based on Silicon-On-Insulator (SOI) process. For the piezoelectric detection, a new configuration based on Lead Zirconate Titanate (PZT)/Pt structure is introduced and leads to much better sensitivity than the traditional Pt/PZT/Pt sandwich structure. Finally, the principle of electronic circuits enabling high sensitivity and low power consumption are proposed. 展开更多
关键词 MAGNETOMETER MEMS (micro-electromechanical systems) pico satellites piezoelectric.
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Comparative study on photocatalytic properties of TiO_2 nanoparticles prepared in acidic medium and basic medium by hydrothermal method
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作者 辛柏福 李丽 王鹏 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第5期703-707,共5页
In order to investigate the difference of phtotocatalytic properties of TiO2 samples prepared in different pH conditions, TiO2 nanopartieles were prepared in acidic medium and basic medium by a hydrothermal process, r... In order to investigate the difference of phtotocatalytic properties of TiO2 samples prepared in different pH conditions, TiO2 nanopartieles were prepared in acidic medium and basic medium by a hydrothermal process, respectively. The samples were characterized using XRD, TEM, BET, XPS, surface photovoltage spectroscopy (SPS) and field-induced surface photovohage spectroscopy (FISPS). Effects of temperature and pH in the hydrothermal process on particle sizes, specific surface areas, and photoeatalytic properties of the TiO2 nanoerystalline were investigated. The experimental results indicate that the photocatalysis activity of TiO2 nanoparticles prepared in basic medium ( B-TiO2 ) is superior to that in acidic medium ( A-TiO2 ), which is ascribed to the difference of surface state between A-TiO2 and B-TiO2. 展开更多
关键词 TiO2 ohotocatalvsis hvdrothermal SPS
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