石墨还原一次烧成SrTiO3基电容—压敏复合功能陶瓷材料的研究

采用石墨还原一次烧成工艺制备了ＳｒＴｉＯ３基电容－－压敏复合功能陶瓷材料探讨了施主Ｎｂ，受主Ｍｎ掺量对材料介电性能的影响。结果表明：Ｎｂ２Ｏ５的掺杂量在０．６ｍｏｌ％时可获得高介电常数，低电阻率的材料；Ｍｎ有助于形成晶界势垒，提高材料的压敏非一，Ｍｎ（ＮＯ３）２添加量为０．０５－０．０６ｍｏｌ％可获得电容－压敏综合性能较好的陶瓷材料，通过对比空气中烧成和石墨还原一次烧成新工艺，认为石墨还原烧成工艺     

新型低压WO3基压敏电阻掺杂及制备条件研究

研究了Ｃｏ２Ｏ３掺杂剂工艺及条件等对低压ＷＯ３基压敏电阻性能的影响,在保持ＭｎＯ２及Ｎａ２ＣＯ３含量不变的前提下,我们发现,对于ＷＯ３－ＭｎＯ２－Ｎａ２ＣＯ３系列,掺入Ａｌ２Ｏ３可以明显改善其电化学稳定,但同时也失去了非线性,而Ｃｏ２Ｏ３的掺入可以明显提高非线性,以１％（摩尔分数）的Ｃｏ２Ｏ３含量为最好,其α值约为５．５（从Ｕ１ｍＡ到Ｕ０．ｍＡ）击穿场强小于１０Ｖ／ｍｍ。最高烧结温度应不低于１１０     

MgO—B2O3—SiO2—Al2O3—CaO中含硼组分析晶动力学

根据玻璃形成动力学理论，计算了ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２－Ａｌ２Ｏ３－ＣａＯ渣系中含硼组分２ＭｇＯ·Ｂ２Ｏ３的成核速度（Ｉ）和晶体长大速度（Ｕ），获得了２ＭｇＯ·Ｂ２Ｏ３晶体形成的最佳温度．采用化学分析、Ｘ射线衍射分析（ＸＲＤ）和差热分析（ＤＴＡ）等方法研究了热处理温度对ＭｇＯ—Ｂ２Ｏ３—ＳｉＯ２—Ａｌ２Ｏ３—ＣａＯ渣系硼提取率的影响．结果表明：硼渣最佳热处理温度与２ＭｇＯ·Ｂ２Ｏ３晶体形成最佳温度一致。     

PbO—Bi2O3—B2O3—SiO2l系重金属氧化物玻璃的结构与光学性能

通过密度，可见光光谱，红外吸收光谱，Ｃｏ－６０辐照损伤试验及荧光光谱的测试，研究了ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２玻璃系的光学性能与结构。密度最高可达８．４６４ｇ／ｃｍ＾３，其紫外吸收边截止波长随Ｐｂ＾２＋及Ｂｉ＾３＋含量升高而红移。     

MSnO3和MSn0.5Zr0.5O3（M=Sr,Ba）的水热合成

本文利用水热合成方法对ＭＳｎＯ３和ＭＳｎ０．５Ｚｒ０．５（Ｍ＝Ｓｒ，Ｂａ）的合成进行了研究，并采用ＸＲＤ、ＳＥ几ＩＣＰ等进行产物进行了表征，结果表明：在Ｍ（ＯＨ）２．ＳｎＯ２（呈ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ体系中，当ＫＯＨ／Ｓｎ和ＫＯＨ（Ｓｎ＋Ｚｒ）≥３０时，２６０℃下晶化５－７天，可获得ＭＳｎＯ３和ＭＳｎ０．５Ｏ３纯相，在Ｍ（ＯＨ）３－（ＳｎＯ２＋ＺｒＯ３）－ＫＯＨ－Ｈ２Ｏ体系中，可通过控制介质     

CaO—MgO—Fe2O3—Al2O3—SiO2渣系玻璃晶化动力学

根据玻璃形成动力学理论,计算了ＣａＯ－ＭｇＯ－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－ＳｉＯ２渣系中成核速率（Ｉ）和晶体长大速度（Ｕ）,获得晶体形成的最佳温度,研究了热处理温度对ＣａＯ－ＭｇＯ－Ｆｅ２Ｏ３－Ａｌ２Ｏ３－ＳｉＯ２渣系晶体的影响,计算的晶体形成的最佳温度结果表明与该体系的最佳热处理温度一致。     

立方A^4＋M^5＋2O7型化合物与新型负热膨胀材料

概述了立方Ａ＾４＋Ｍ＾５＋２Ｏ７型化合物的结构特点，讨论了ＡＶ２－ｘＰｘＯ７型（Ａ＝Ｚｒ或Ｈｆ；ｘ＝０．１～１．２）及其部分取代的Ａ＾４＋１－ｙＢ＾４＋ｙＶ２－ｘＰｘＯ７型（Ｂ＝Ｔｉ，Ｃｅ，Ｔｈ，Ｕ，Ｍｏ，Ｐｔ，Ｐｂ，Ｓｎ，Ｇｅ或Ｓｉ；ｙ＝０．１～０．４）和Ａ＾４＋１－ｙＣ＾１＋ｙＤ＾３＋ｙＶ２－ｘＰｘＯ７型（Ｃ为碱金属元素，Ｄ为稀土金属元素）材料的负热膨胀性能。     

Nb2O5对ZTM-Al2O3性能及ZrO2增韧机制的影响

探讨了Ｎｂ_２Ｏ_５对ＺＴＭ－Ａｌ_２Ｏ_３的性能和ＺｒＯ_２在瓷体中增韧机制的影响．发现Ｎｂ_２Ｏ_５的引入可明显提高瓷体中ｍ－ＺｒＯ_２含量而降低ｔ－ＺｒＯ_２含量,材料的机械性能也随Ｎｂ_２Ｏ_５添加量的增大出现了显著的改善,并且有韧性的平方正比于ｍ－ＺｒＯ_２含量的关系．ｍ－ＺｒＯ_２含量的增加强化了微裂纹增韧是材料性能改善的原因．     

MSnO_3和MSn_（0．5）Zr_（0．5）O_3（M＝Sr，Ba）的水热合

本文利用水热合成方法对ＭＳｎＯ３和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３（Ｍ＝Ｓｒ，Ｂａ）的合成进行了研究，并采用ＸＲＤ、ＳＥＭ和ＩＣＰ等方法对产物进行了表征，结果表明：在Ｍ（ＯＨ）２－ＳｎＯ２（或ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ体系中，当ＫＯＨ／Ｓｎ和ＫＯＨ／（Ｓｎ＋Ｚｒ）≥３０时，２６０℃下晶化５～７天，可获得ＭＳｎＯ３和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３纯相，在Ｍ（ＯＨ）２－（ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ－Ｈ２Ｏ体系中，可通过控制介质碱度来获得ＭＳｎＯ３＋ＭＺｒＯ３混合物和ＭＳｎ（０．５）Ｚｒ（０．５）Ｏ３，并根据合成规律初步探讨了反应过程．     

ZnO/Co2O3敏感电阻单元材料V-I非线性及NTC效应

制备的ＺｎＯ／Ｃｏ２Ｏ３敏感电阻单元材料同时具有伏安（Ｖ－Ｉ）非线性等性及负温电阻（ＮＴＣ）效应。两种效应的形成与烧结过程９００℃热处理温度密切相关。差热分析（ＤＴＡ）曲线表明：Ｃｏ２Ｏ３在９０４℃有一相变吸收峰。在该温度点保温热处理的ＺｎＯ／Ｃｏ２Ｏ３敏感电阻单元材料获得相对在的伏安非线性和ＮＴＣ效应。电子自旋共振谱（ＥＳＲ）证明,Ｃｏ离子由烧结热处理前的Ｃｏ＾３＋价变成热处理后的Ｃｏ＾２＋价,     

基于正交试验的La_2O_3掺杂SnO_2气敏传感器的研究

以SnO2纳米粉和La2O3纳米粉为原料,采用高能球磨技术,结合正交试验设计,制备了经过高能球磨的纯SnO2纳米粉体和掺杂适量La2O3的SnO2纳米粉体。利用传统的厚膜气敏传感器制备工艺,制备了纯SnO2厚膜气敏传感器及掺杂一定量La2O3的SnO2厚膜气敏传感器。并对其本征电阻及其对乙醇、汽油、丙酮、氢气和CO等气体的敏感特性进行了测试。结果表明各因素对综合气敏性能影响的显著性水平由大到小依次为La2O3掺杂浓度〉烧结时间〉老化时间〉烧结温度。同时,通过分析还得到了最佳组合工艺。La2O3掺量为5%（质量分数）,烧结时间为2h,老化时间为7d,烧结温度为650℃条件下制备的气敏元件的综合气敏性能最好,其中对1.0×10-3乙醇蒸气的灵敏度达107.2,对相同浓度的干扰气体的选择性分别为S乙醇/S汽油=11.3,S乙醇/S丙酮=9.1。     

掺V2O5对SnO2气敏性能的影响

研究了掺Ｖ２Ｏ５对ＳｕＯ２元件电阻和稳定性的影响，掺杂后，稳定性提高但灵敏度下降；杂量〈０．５６Ｗ．％，电阻降低；掺杂量〉０．５６Ｗｔ％时，电阻上升，利用量子化学分析机理，结果表明：由于Ｖ＾５＋的掺入，提高了ＳｎＯ２晶胞前线轨道及材料的稳定性；在掺杂量少时，由于氧原子的空穴态和锡原子的电子态增加，使材料的电阻下降，在的掺杂量多时，因电子输运轨道受阻导致电阻增大。     

Y_2O_3-SnO_2常温气敏薄膜的Sol-Gel制备及性能研究

以无机盐ＳｎＣｌ２·２Ｈ２Ｏ,Ｙ（ＮＯ３）３·６Ｈ２Ｏ为原料,无水乙醇为溶剂,采用溶胶－凝胶工艺制备了Ｙ２Ｏ３掺杂的ＳｎＯ２薄膜．采用差热－失重分析研究了Ｙ２Ｏ３掺杂的ＳｎＯ２干凝胶粉末的热分解、晶化过程．研究了Ｙ２Ｏ３－ＳｎＯ２薄膜的电学和气敏性能．从实验中得到了Ｙ２Ｏ３掺杂份量对ＳｎＯ２薄膜电学及气敏性能的影响．实验表明Ｙ２Ｏ３掺杂的ＳｎＯ２薄膜在常温下对ＮＯｘ具有较好的灵敏度和选择性,并具有较好的响应恢复性能;在常温下对Ｈ２Ｓ气体也具有一定的灵敏度．     

Electrochemical treatment of paper mill wastewater using three-dimensional electrodes with Ti/Co/SnO2-Sb2O5 anode

The properties of the interlayer and outer layer of Ti/Co/SnO2-Sb2O5 electrode were studied, and the electrochemical behavior was examined as well. As a result of unsatisfactory treatment using Ti/Co/SnO2-Sb2O5 electrode, electrochemical disposal of paper mill wastewater employing three-dimensional electrodes, combining active carbon granules serving as packed bed particle electrodes, with Ti/Co/SnO2-Sb2O5 anode, was performed. The outcome demonstrates that efficient degradation was achieved. The residual dimensionless chemical oxygen demand (COD) concentration reached 0.137, and color removal 75% applying 167 mA cm(-2) current density at pH 11 and 15 g l(-1) NaCl. The instant current efficiency, energy cost, electrochemical oxidation index (EOI) and kinetic constant of the reaction were calculated. At the same time, the influence of pH and current density on COD abatement and decolorization was also investigated, respectively.     

Ti／RuO2＋SnO2＋Sb2O3｜Pb3O4阳极的性能研究

本文对Ｔｉ│ＲｕＯ２＋ＳｎＯ２＋Ｓｂ２Ｏ３│Ｐｂ３Ｏ４阳极进行了ＳＥＭ、ＥＤＳ、ＸＲＤ研究，考察了在ＩＭＨ２ＳＯ４中电极寿命，测定了该电极的电化学动力学参数ａ、ｂ、ｉ０，并用双位垒模型讨论了其电化学性能，结果表明该电极具有优良的电化学性能和较长的使用寿命。     

SnO2@Co3O4 hollow nano-spheres for a Li-ion battery anode with extraordinary performance

SnO2@Co3O4 hollow nano-spheres have been prepared using the template-based sol-gel coating technique and their electrochemical performance as an anode for lithium-ion battery （LIB） was investigated. The size of synthesized hollow spheres was about 50 nm with the shell thickness of 7-8 nm. The fabricated SnO2@Co3O4 hollow nano-sphere electrode exhibited an extraordinary reversible capacity （962 mAh-g-1 after 100 cycles at 100 mA-g-1）, good cyclability, and high rate capability, which was attributed to the Co-enhanced reversibility of the Li20 reduction reaction during cycling.     

Direct oxidation of n-heptane to ester over modified sulfated SnO2 catalysts under mild conditions

The direct oxidation of n-heptane to ester using air as the oxidant under mild conditions assisted by sulfated tin oxide (SO(4)(2-)/SnO(2)) and Co modified sulfated tin oxide (SO(4)(2-)/SnO(2)-Co(2)O(3)) prepared by chemical co-precipitation method and characterized by means of SEM, XRD, FT-IR and XPS techniques was studied. From the results it was found that the catalytic activity of SO(4)(2-)/SnO(2)-Co(2)O(3) is higher than that of SO(4)(2-)/SnO(2) in this target reaction, and two asymmetric esters: diisobutyl phthalate and cyclohexylmethyl tridecyl oxalate that have not been reported in the directly oxidation of n-heptane by traditional method have been obtained. The possible mechanism was also discussed.     

Ti/SnO_2 Sb_2O_3 MnO_2/PbO_2阳极的性能研究

制备了一种非贵金属阳极－Ｔｉ／ＳｎＯ２＋Ｓｂ２Ｏ３＋ＭｎＯ２／ＰｂＯ２,并用ＸＲＤ、ＳＥＭ进行了表征,计算出了电极的分形维数,测定了该电极在硫酸中的使用寿命和动力学参数,把该电极用于处理含酚废水和Ｐｂ电极进行对比．结果表明,节电３３％,转化率达９５％,是一种优良的电化学催化剂．     

The structure and photoluminescence properties of Bi2O3-core/SnO2-shell nanowires

Bi2O3-core/SnO2-shell nanowires have been prepared by using a two-step process: thermal evaporation of Bi2O3 powders and sputtering of SnO2. The crystalline nature of the Bi2O3-core/SnO2-shell nanowires has been revealed by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). TEM analysis and X-ray diffraction (XRD) results indicate that the Bi2O3-core/SnO2-shell nanowires consist of pure tetragonal alpha-Bi2O3-phase momocrystalline cores and tetragonal SnO2-phase polycrystalline shells. The photoluminescence (PL) measurements show that Bi2O3 nanowires have a broad emission band centered at around 560 nm in the yellow-green region. On the other hand, the Bi2O3-core/SnO2-shell coaxial nanowires with the sputtering times of 4 and 8 min have a blue emission band centered at around 450 nm. In contrast, those with a sputtering time of 10 min have a broad emission band centered at approximately 550 nm again. The origin of this yellow-green emission from the core/shell nanowires, however, quite differs from that from Bi2O3 nanowires, i.e., it is not from the Bi2O3 cores but from the SnO2 shells.     

稀土氧化物掺杂对SnO2基气体传感器材料性能的影响

采用化学共沉淀法制备Ｙ２Ｏ３、ＺｒＯ２,Ｅｒ２Ｏ３和Ｓｂ２Ｏ２基气体传感器。结果表明掺杂后的材料经煅烧后,平均晶粒尺寸均小于３０ｎｍ,比未经掺杂的材料小,中掺杂体系不同成分材料制备成厚膜传感器,进行了对ＣＯ气体敏感度性能测试,发现掺杂稀土氧化物的气体敏感度较纯ＳｎＯ２厚膜传感器高。其中掺杂Ｅｒ２Ｏ３材料性能最好。