脉冲激光沉积SrBi2Ta2O9铁电薄膜电容特性研究

用ＰＬＤ方法成功地制备了ＳＢＴ铁电薄膜，并制作成Ｐｔ／ＳＢＴ／Ｐｔ薄膜电容器。ＳＢＴ薄膜的晶面取向以（００８）和（１１５）为主。在５Ｖ电压下，极化反转，并且得到较饱和的电滞回线，剩余极化强度和矫顽电场分别为８４μＣ／ｃｍ２和５７ｋｖ／ｃｍ。ＩＶ特性测试显示两个对称的双稳峰，并得到零电压下，面积为３１４×１０４μｍ２，厚度为０３５μｍ的电容器，电容约为５６０ｐＦ，介电常数约为６００。疲劳测试表明Ｐｔ／ＳＢＴ／Ｐｔ具有优良的抗疲劳特性。     

用分步沉积法去除Nb(OH)5/Ta(OH)5中Ti,Sb等金属杂质的工艺研究

从理论和实践应用方面，研究了在不同活性金属离子存在的条件下控制pH值，应用分步沉积的方法去除Nb(OH)5/Ta(OH)5中某些金属杂质。在一定温度下，可在不影响Nb(OH)5/Ta(OH)5沉积的条件下，达到有效去除Ti，Sb，Sn，Al，Fe等杂质元素的目的。     

钨精矿、锡石矿中铌和钽的5—Br－PADAP分光光度法的测定

用２－（５－溴－２吡啶偶氮）－５－二乙氨基苯酚（５－Ｂｒ－ＰＡＤＡＰ）为显色剂，采用多波长分光光度法测定钨精矿、难溶锡石矿中的铌、袒，方法快速、准确、灵敏度高，相对标准偏差≤０．０２１（ｎ＝１６）．     

用相变方法制取高纯度超细钽粉的研究

报导了通过相变热处理使Ｋ２ＴａＦ７晶体参数发生变化，以利于制取高纯度超细钽粉的实验依据和结果。结果表明，Ｋ２ＴａＦ７在２００～２５０℃发生可逆相变；相变后Ｋ２ＴａＦ７晶体的粒径可由原来的１３５１．８μｍ减小至７０．８μｍ，极大地提高了比表面积；相变后，杂质极大挥发，提高了Ｋ２ＴａＦ７的纯度。     

Microstructure and hardness of binary Cr-Ta alloys

The dependances of the microstructure and hardness of the binary Cr-Ta alloys [ Cr-9.0, -9.2, -9.4, -9.6,-9.8, and -13.0 Ta] (mole fraction, %) were investigated. When Ta content of the alloy is less than 9.4%, there are primary dandrite grains of a Cr solid-solution phase existing in the matrix of Cr-Cr2Ta eutectic colonies in the alloy. Moreover, the regular polygon grains of the primary Cr2Ta Laves-phase are surrounded by the Cr-Cr2Ta eutectic colony in the hyper-euteetic Cr-9.4 96 Ta alloys. The scanning electron microphotograph shows that one of the Cr2Ta phase plates of an eutectic colony always connects with the primary Cr2Ta Laves-phase grain in a hyper-eutectic alloy. The eutectic colony size of Cr-Ta alloys decreases with increasing Ta. In addition, the macrohardness of Cr-Ta alloys is influanced by the chemical composition at room temperature. The binary eutectic Cr-Ta alloy presents the lowest hardness on a macrohardness scale.     

Ta与Ta-2.5W在硫酸溶液中的电化学性能比较

利用电化学测试仪Mode173A测试了Ta和Ta-2．5W在温度为60℃，浓度为30％，60％和80％的硫酸溶液中的Tafel曲线和动电位扫描阳极极化曲线。结果表明，在3种浓度的硫酸溶液中，Ta-2．5W的腐蚀倾向于Ta的腐蚀倾向，腐蚀电流密度比Ta的小，钝化性能比Ta的优越。     

(K0.45Na0.55)0.98Li0.02Nb0.77Ta0.18Sb0.05O3-Co0.85Cu0.15Fe2O4复合陶瓷的磁电性能研究

以压电体(K0.45Na0.55)0.98Li0.02Nb0.77Ta0.18Sb0.05O3和压磁体Co0.85Cu0.15Fe2O4为原料,通过传统的固相反应法制备了(1-x)[(K0.45Na0.55)0.98Li0.02Nb0.77Ta0.18Sb0.05O3]-xCo0.85Cu0.15Fe2O4多铁性复合陶瓷,并使用X射线衍射仪、扫描电子显微镜、压电测试仪、铁电测试仪和磁电耦合测试仪对物相、显微结构、压电、铁电、磁电耦合性能进行了分析。结果表明,复合陶瓷的相结构保持为(K0.45Na0.55)0.98Li0.02Nb0.77Ta0.18Sb0.05O3和Co0.85Cu0.15Fe2O4两种物相,但两者之间发生了轻微的化学反应。随着Co0.85Cu0.15Fe2O4压磁相含量的增加,复合陶瓷的压电系数从56pC/N减小到21pC/N,剩余极化强度略有降低。在压磁相含量为0.2时可获得4.3mV·cm-1·Oe-1的最佳磁电耦合系数。     

Investigations of ferritic/martensitic super heat resistant 11‐12 %Cr steels for 650 °C power plants

The investigations of advanced ferritic/martensitic 11–12 %Cr steels for 650 °C power plant components focus on the improvement of high‐temperature creep properties with respect to chemical composition. The claim of the DFG research work was the development of new heat‐resistant 12 %Cr ferritic‐martensitic steels with sufficient creep and oxidation resistance for a 650 °C application by using basic principles and concepts of physical metallurgy on the basis of the state of art and to overcome the usual trial and error industrial alloy development. Efforts are focussed on a 100,000h creep strength of 100MPa at 650 °C in combination with a sufficient corrosion resistance by a Cr content of 12 % with contents 4‐5 %W, 3.4‐5,5 %Co, V, B and 1 %Cu as well as the choice of Ta or Ti instead of Nb. The results demonstrate that the aim is not to realize with the used alloying concept. In the long term range all 12 %Cr melts have a lower creep rupture strength than the advanced 9 %Cr piping steel P92. A high creep strength could be reached with a 0.06 % Ta alloyed 11 %Cr melt, which is in addition alloyed with a higher C and B content and as well as with lower W and Co portions. The results indicate in accordance with the finding of other steel researcher that a lower Cr content allows more effectiveness for the alloying partners respectively for the generation of more stable precipitates.     

电感耦合等离子体质谱法测定钽粉中的磷

介绍了采用电感耦合等离子体质谱法（ICP—MS）对钽粉中微量杂质磷进行测定的方法。通过使用耐氢氟酸的惰性进样系统、屏蔽炬（shned torch）和冷等离子体技术，以及对测试条件的探讨，成功地运用标准加入法测量了金属钽粉中微量磷的含量。     

镀钽TiNi形状记忆合金表面的XPS分析

采用多弧离子镀的方法在Ti 50.6%(原子分数)Ni形状记忆合金表面沉积了钽镀层。通过X射线光电子能谱(XPS)剖面分析发现TiNi合金表面钽镀层厚度均匀,并且在镀层与基体之间形成一薄层过渡层。将镀钽TiNi合金曝露于空气中后,通过XPS的全谱和高分辨谱图对其表面的成分和价态分析发现,镀钽层表面由于钽在空气中自然氧化形成了一层很薄的钽的氧化膜,最表面为高价钽的氧化物(Ta2O5),次表面为低价钽氧化物的混合物TaO2、TaO和TaOx(x<1)。