Ti-V基贮氢合金电极电化学性能的影响因素

研究了粉体粒度、导电镍粉及工作温度对合金电极Ti0 .1 7Zr0 .0 8V0 .35Ni0 .1 0 Ni0 .30 放电性能的影响。结果表明 :随着合金粒度的减小 ,放电容量有所增加 ,但放电容量随着循环数的增加而有所降低 ;而导电羰基镍粉含量的变化对合金电极的放电容量几乎没有影响。随着合金电极工作温度的增加 ,合金电极的循环稳定性、充、放电电压均有所降低。温度明显地影响Ti V基贮氢合金电极中V在电介质溶液中的溶解。

Synthesis and crystal structure of the dimeric, Ti-O-Ti bridged hydrid form polyoxoanion [alpha-1, 2-PW10Ti2O39](2)(10-)

The reaction of trivacant precursor Nag [A-PW9O34] . 19H(2)O with Ti(SO4)(2) affords the novel dimeric, di-Ti-IV-substituted tungstophosphate K4Na6[alpha-1,2-PW10Ti2O39](2) . 14H(2)O. The X-ray structural determination shows the dimeric, anhydride structure was formed by two Ti-O-Ti bonds linking two di-titanium-substituted Keggin anion [alpha-1,2-PW10Ti2O40]. It was also characterized by elemental analysis, TGA, FT-IR and U-V-vis spectroscopies.

Determination of rare and rare earth elements in soils and sediments by ICP-MS using Ti(OH)(4)-Fe(OH)(3) co-precipitation preconcentration

A method was developed for the determination of trace and ultratrace amounts of REE. Cd. In. Tl. Th. Nb, Ta. Zr and Hf in soils and sediments. With NaOH-Na2O2 as the flux. Ti(OH)(4)-Fe(OH)(3) co-precipitation as the preconcentration technique and inductively coupled plasma mass spectrometry (ICP-MS) for measurement, the whole procedure was concise and suitable for batch analysis of multi-element solutions. An investigation was carried out of the Ti(OH)(4)-Fe(OH)(3) co-precipitation system, and the results obtained showed that the natural situation of Ti tightly coexisting with Nb. Ta, Zr and Hf in geological samples plays a very important role in the complete co-precipitation of the four elements. The accuracy of this procedure was established using six Chinese soil and sediment certified reference materials (GSS and GSD). and the relative errors between the found and certified values were mostly below 10%.

取代茚基的茂金属Ti、Zr化合物的合成及其催化乙烯聚合活性

合成了 4种取代茚基均配及混配型的茂金属化合物 ( 1 -C6 H5 CH2 Ind) 2 MCl2 ( M=Ti( 1 ) ,Zr( 2 ) )、( 1 -C6 H5 CH2 Ind) Cp MCl2 ( M=Ti( 3) ,Zr( 4) ) .通过 IR、1 H NMR、EI-MS和元素分析对化合物进行了表征 .用所合成的茂金属化合物与 MAO所组成的催化体系 ,研究了乙烯的聚合 .发现金属为 Ti的催化剂没有聚合活性或活性极低 .金属为 Zr的催化剂有一定的催化活性 ,不同的催化剂得到的聚合物性质有一定的差异 .

茂金属催化剂Cp_2~tMCl_2(Cp~t=~tBuC_5H_4,M=Ti、Zr、Hf)聚合丁烯-1的研究

探讨了茂金属催化剂 Cpt2 MCl2 ( Cpt=t Bu C5 H4,M=Ti,Zr,Hf)的合成以及用于聚合丁烯 -1的研究 ,研究了几种不同的茂金属催化剂和不同聚合条件下的催化行为 ,并通过 IR、1 H NMR、EI-MS、DSC、粘度法测分子量和正庚烷抽提等测试手段对催化剂和聚合物进行了表征 .结果表明 ,叔丁基取代的茂金属催化剂催化丁烯 -1聚合具有较高的催化活性 ,叔丁基的引入提高了聚合物的等规度和分子量

Ti-Al系金属间化合物的价电子结构及其合金化行为

由固体和分子经验电子理论(EET)分析了Ti-Al系金属间化合物合金化前后的价电子结构,再计算了该系合金各相的均匀变形因子α和解理能Gc 值,据此分析了合金化对该系金属间化合物脆性的影响。结果表明,常量合金化元素Nb使Ti3Al基合金的α2相无序化,增加了韧的第二相,减弱了Ti-Ti共价键,综合导致α和Gc 值增大,使Ti3Al的脆性有本质改善;微量合金化元素Mn减弱了TiAl基合金的Al-Al共价键,并诱发孪生,使α和Gc 有所提高,在一定程度上降低了TiAl的脆性;TiAl3极低的α和Gc导致恶劣的本征脆性,Mn也难以改变其脆性本质

Ti-Al合金环境脆性机制的电子理论

根据固体与分子经验电子理论(EET)分析计算Ti-Al系金属间化合物及氢和氧影响下各相的价电子结构与解理能Gc，据此分析Ti-Al系金属间化合物的环境脆性(EE)．结果表明，Ti3Al的氢脆是由于高氢含量下易生成性相引起的；TiAl的氢脆是由于固溶氢减弱含氢TiAl晶胞主干键并降低解理能引起的．而Ti3Al固溶氧使其键结构呈更严重的各向异性，导致Ti3Al脆性加剧；在氧含量较高时，氧化物TiO2形成将导致更加恶劣的脆性，而形成最强键ｎA和热稳定性较高的Al2O3将会有好的抗氧化性．同时也解释一些尚有争议的实验结果，并提出一些解决环境脆性的韧化途径.

Comparative study on the doping effect of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M=Sc,Ti,V,Cr,Mn,Fe,Co,Ni, or Zn)

With XRD, R-T, and ac chi measurements a comparative study on the doping effects of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) has been carried out. The effects of the former five members are significantly different, both on phase formed and on T-c, from the latter four. It seems that the effect on phase stabilization correlates with the valency of the doped cation. In connection with the instability of the 2223 phase, the correlation has been discussed.

The phase transitions of hetero atoms substituted molecular sieves Me-VPI-5(Me=Mg, Ti, Sn, Si) and their influence on spectra structures of Eu(III) ion

The hetero atom substituted aluminophosphate molecular sieves Me-VPI-5(Me = Mgt Ti, Sn, Si) were synthesized hydrothermally. Rare earth ions are originally doped into these microporous materials by aqueous solution ion exchange procedures. The phase transitions of the microporous materials are investigated by high-temperature and high-pressure experimental techniques. The influence of the phase transitions on the rare earth ions' spectral structures is discussed, With the increase of temperature, Eu(II)Mg-VPI-5 is converted into Eu(II)Mg-AIPO(4)-8, then into tridymite phase. The pressure has a notable influence on Eu(II) ion's spectral structures. The spectral structures have changed regularly with the increase of pressure.

杂原子Me－VPI－5（Me＝Mg，Ti，Sn，Si）相转变及其对Eu（Ⅲ）光谱结构的研究

用水热同晶置换法合成了杂原子磷酸铝分子筛Ｍｅ－ＶＰＩ－５（Ｍｅ＝Ｍｇ，Ｔｉ，Ｓｎ，Ｓｉ）．通过水相离子交换法掺杂稀土离子，考察了高温和高压下的相变行为．讨论了相变过程对稀土离子光谱的影响．随着温度升高，Ｅｕ（Ⅲ）Ｍｇ－ＶＰＩ－５先转变为Ｅｕ（Ⅲ）－ＡｌＰＯ４－８，然后又转变成致密的磷石英相．压力对Ｅｕ（Ⅲ）光谱结构具有显著影响．随着压力增加，Ｅｕ（Ⅲ）光谱结构发生规律性变化．