期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
稀土Nd^(3+)与Cu^(2+)掺杂非晶态纳米Ni(OH)_2材料的电化学性能 被引量:2
1
作者 李广燕 刘长久 +1 位作者 吴华斌 赵卫民 《化学工程》 CAS CSCD 北大核心 2009年第12期55-58,共4页
晶态氢氧化镍[Ni(OH)2]在碱性电解液中易发生相变,影响其电化学性能。文中采用微乳液快速冷冻共沉淀法制备Nd3+和Cu2+复合掺杂非晶态纳米Ni(OH)2粉体材料,并对其结构形貌及物理特性进行表征分析。结果表明,制备出的非晶态Ni(OH)2样品材... 晶态氢氧化镍[Ni(OH)2]在碱性电解液中易发生相变,影响其电化学性能。文中采用微乳液快速冷冻共沉淀法制备Nd3+和Cu2+复合掺杂非晶态纳米Ni(OH)2粉体材料,并对其结构形貌及物理特性进行表征分析。结果表明,制备出的非晶态Ni(OH)2样品材料,微结构含有较多结晶水,物相近似球形,粒径大小在20—30nm。对样品电极材料的电化学性能测试发现,掺杂Nd3+和Cu2+的摩尔比为2∶1时,所制备的样品材料合成镍电极,并组装成MH-Ni模拟电池,在恒电流80mA/g下充电6h,40mA/g放电,终止电压为1.0V的充放电条件下,放电比容量高达348.0mA.h/g,放电中值电压为1.2723V,同时样品电极材料的氧化还原可逆性较好,电极过程的电化学阻抗较小。电化学性能优于目前MH-Ni生产应用的晶态β-Ni(OH)2电极材料。 展开更多
关键词 微乳液快速冷冻共沉淀法 nd3+和cu2+复合掺杂 非晶态纳米Ni(OH)2材料 电化学性能
下载PDF
稀土铈(Ce^(3+))、钕(Nd^(3+))对水花生叶片Cu^(2+)毒害效应的影响 被引量:6
2
作者 陈苏雅 《南京师大学报(自然科学版)》 CAS CSCD 北大核心 2009年第1期99-104,共6页
研究了不同浓度Ce3+、Nd3+对水花生(Alternanthera philoxeroides(Mart.)Griseb.)叶片Cu2+毒害的影响.结果表明,在Cu2+毒害下,水花生的叶绿素和可溶性蛋白含量下降,保护酶系统(POD、SOD、CAT)活性降低,O2.-产生速率和膜脂过氧化产物MDA... 研究了不同浓度Ce3+、Nd3+对水花生(Alternanthera philoxeroides(Mart.)Griseb.)叶片Cu2+毒害的影响.结果表明,在Cu2+毒害下,水花生的叶绿素和可溶性蛋白含量下降,保护酶系统(POD、SOD、CAT)活性降低,O2.-产生速率和膜脂过氧化产物MDA含量上升,H2O2含量降低,一定浓度(2.5~7.5mg/L)的Ce3+、Nd3+处理,都能不同程度地缓解这些现象.而更高浓度的Ce3+、Nd3+处理的缓解作用不断减弱,甚至加重Cu2+毒害.相比之下,单一Ce3+的作用效果优于单一Nd3+.总的看来,Ce3+、Nd3+的最适浓度为5~7.5mg/L.Ce3+、Nd3+缓解重金属毒害的作用可能与调节蛋白质的表达及活性氧代谢有关. 展开更多
关键词 Ce^3+、nd^3+ cu^2+水花生 毒害 缓解
下载PDF
x变化对Nd_(1+x)Ba_(2-x)Cu_3O_y结构与性能的影响
3
作者 司平占 樊占国 袁奇峰 《包头钢铁学院学报》 CAS 2000年第4期289-291,共3页
用X ray衍射方法研究了不同 x值对烧结 Nd1+xBa2 -xCu3Oy 样品衍射图谱的影响规律 对不同Nd42 2相加入量的烧结及区域熔炼Nd1+xBa2 -xCu3Oy 超导体进行了X ray粉末衍射并测量了各样品的Jc 值 ,对比结果表明 ,Nd42 2相的加入会使Nd1+xBa... 用X ray衍射方法研究了不同 x值对烧结 Nd1+xBa2 -xCu3Oy 样品衍射图谱的影响规律 对不同Nd42 2相加入量的烧结及区域熔炼Nd1+xBa2 -xCu3Oy 超导体进行了X ray粉末衍射并测量了各样品的Jc 值 ,对比结果表明 ,Nd42 2相的加入会使Nd1+xBa2 -xCu3Oy 中的x值增大并影响Jc 对取代与Nd1+xBa2 -xCu3Oy 超导体性能的关系做了初步的探讨 ,认为 ,取代的作用是双重的 ,Nd12 3之所以具有很好的Jc B特性 ,正是Nd Ba取代的作用使然 ;适量的取代对改善样品的性能是有好处的 。 展开更多
关键词 nd1+xBa2-xcu3Oy 超导体 nd-Ba取代 区域熔炼 性能 结构
下载PDF
Heat Treatment of Nd_(1+x)Ba_(2-x)Cu_3O_(7-δ) Superconductors
4
作者 樊占国 司平占 苏大和 《Journal of Rare Earths》 SCIE EI CAS CSCD 2003年第2期198-200,共3页
Two kinds of Nd 1+ x Ba 2- x Cu 3O 7- δ , the sintered samples and zone melted samples, were treated in pure Ar at 950 ℃. The substitution of Nd ions for Ba ions in the Nd 1+ x Ba 2- ... Two kinds of Nd 1+ x Ba 2- x Cu 3O 7- δ , the sintered samples and zone melted samples, were treated in pure Ar at 950 ℃. The substitution of Nd ions for Ba ions in the Nd 1+ x Ba 2- x Cu 3O 7- δ before and after the heat treatment was investigated by XRD. In order to know the effects of heat treatment, the T c and J c of samples with and without the heat treatment in Ar were comparatively studied. The results show that the substitution of Nd for Ba decreases, whereas T c and J c increase after the treatment. The Nd 1+ x Ba 2- x Cu 3O 7- δ samples were oxygenated in pure oxygen at 300 ℃ . Based on the XRD spectra it was found that the samples with x <0.4 can transform from tetragonal phase into orthorhombic phase after the oxygenation, whereas in the sample with x >0.4 no phase transition occurs even after a long time oxygenation. 展开更多
关键词 inorganic nonmetallic materials nd 1+ x Ba 2- x cu 3O 7- δ superconductors heat treatment solid solubility superconductivity rare earths
下载PDF
Barium Hydroxide Octahydrate (Ba(OH)<sub>2</sub>&middot;8H<sub>2</sub>O) as a Substitute Alternative for Barium Carbonate (BaCO<sub>3</sub>) in Synthesis Superconductor of Nd<sub>1</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>Phase
5
作者 M. Sumadiyasa I. B. S. Manuaba P. Suardana 《Journal of Materials Science and Chemical Engineering》 2018年第7期117-124,共8页
One of the basic ingredients in conventional preparation of cuprates-based superconducting materials such as the Nd-Ba-Cu-O superconducting system, especially the Nd1Ba2Cu3O7-δ phase is Barium Carbonate (BaCO3). It h... One of the basic ingredients in conventional preparation of cuprates-based superconducting materials such as the Nd-Ba-Cu-O superconducting system, especially the Nd1Ba2Cu3O7-δ phase is Barium Carbonate (BaCO3). It has the potential to produce the carbon dioxide (CO2) air pollutant. Therefore it is necessary to look for other materials as the source of Ba atom which does not produce CO2 gas. In this research has been successfully made the Nd1Ba2Cu3O7-δ phase with the Barium Hydroxide Octahydrate (Ba(OH)2·8H2O) as a source of Ba atom. The results of the characterization XRD has been shown the main peaks of the Nd1Ba2Cu3O7-δ phase. Refinement of the XRD data by using Rietica software, obtained the value of GofF (Goodness of Fit) = 1.7023 and lattice parameter a ≈ b < c/3 with a value of c/3 = 3.9275 A. 展开更多
关键词 nd1Ba2cu3O7-δ PHASE BA Atom BARIUM Carbonate BARIUM Hydroxide Octahydrate GofF
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部