权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

PREPARATION AND CHARACTERIZATION OF SURFACE CONTROLLED FUNCTIONAL MATERIALS USING NON-EQUILIBRIUM ALLOYS AS THEIR PRECURSORS

以非平衡合金为前驱体的表面控制功能材料的制备与表征

基本信息

批准号：
09650776
负责人：
ASAMI Katsuhiko
金额：
$ 2.05万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

1. Ni catalysts supported by zirconia, which have high activity for the reaction for methanation of carbon dioxide with hydrogen, were prepared from amorphous Ni-Zr alloys, and evaluated their activity in relation with alloy composition, reaction temperature. It was found that their activity was highest when they have prepared from Ni-Zr alloys containing Zr from 40 to 50at%Zr. The origin of the alloy composition dependence was explained by the alloy composition dependence of dispersion of metallic Ni on the catalyst surface, turnover number, and the relative concentration of tetragonal zirconia in the support. On the base of the above results, catalysts with higher activity were prepared by addition of a certain amount of Sm which caused stabilization of tetragonal phase of zirconia and increase of Ni dispersion on zirconia.2. Non-equilibrium Nb-W and Nb-Mn alloys were prepared by sputtering method. They showed amorphous structure within the composition range of 20-50at%W and 26-75at% … More Mn, respectively. Their corrosion resistance and surface compositions were evaluated by electrochemical measurements and photoelectron spectroscopy.3. Co-20at%Al alloy prepared by sputtering method was a non-equilibrium metallic compound with CsCl-type structure. When alloy films were prepared by reactive sputtering in NィイD22ィエD2 and OィイD22ィエD2 containing atmosphere, they showed ferromagnetic property with high performance even at high frequency region. It was clarified that they were composed of nano-particles of Co surrounded by insulating AlN and AlィイD22ィエD2OィイD23ィエD2, respectively.4. Sr-Bi-Ta oxides prepared by sol-gel method followed by annealing at low temperatures showed no ferroelectric properties. But they become ferroelectric substance at high temperature annealing. Their performance was, however, dependent on annealing temperature and atmosphere during annealing. It was made clear that deviation of surface composition from stoichiometry and existence of metallic Bi were harmful to ferroelectric performance. Less

1.以非晶态Ni-Zr合金为原料，制备了对CO_2与H_2甲烷化反应具有高活性的ZrO_2负载Ni催化剂，考察了合金组成、反应温度对催化剂活性的影响。结果表明，当Zr含量为40 ~ 50at%时，Ni-Zr合金的活性最高。合金组成依赖性的起源被解释由金属Ni在催化剂表面上的分散的合金组成依赖性，周转数，和在载体中的四氢氧化锆的相对浓度。在此基础上，通过引入一定量的Sm，稳定了ZrO 2的四方相，提高了Ni在ZrO 2上的分散度，制备了活性较高的催化剂.用溅射法制备了Nb-W和Nb-Mn非平衡合金。在20-50at%W和26-75at% W范围内， ...更多信息 Mn，分别。通过电化学测试和光电子能谱分析评价了其耐蚀性和表面组成.用溅射法制备的Co-20at%Al合金是一种具有CsCl型结构的非平衡金属化合物。当在含N_（22）O结果表明，它们分别是由Co纳米颗粒和Al纳米颗粒组成，其中Co纳米颗粒被绝缘的AlN和Al纳米颗粒D22、D2 O纳米颗粒D23、D2 O纳米颗粒所包围.采用溶胶-凝胶法制备的Sr-Bi-Ta氧化物经低温退火处理后没有铁电性能。但在高温退火时，它们变成铁电体。然而，它们的性能取决于退火温度和退火过程中的气氛。表明表面成分偏离化学计量比和金属Bi的存在对铁电性能有害。少