稀土金属

This dissertation divides into seven chapters and the main contents and conclusions are listed as following:1. Three series binuclear lanthanide carboxylate coordination polymers 1～7 have been synthesized under hydrothermal conditions by altering the length of carbon chains between carboxyl group and phenyl ring on ligands, which are isophthalic acid, 1,3-phenylenediacetic acid and 1,3-phenoxydiacetic acid, and lanthanide ions such as Pr~(3+), Eu~(3+)and Ho~(3+).

论文共分七章，主要研究内容和结论如下：1、通过改变间苯二甲酸配体的羧基和苯环之间的碳链长度，从间苯二甲酸、间苯二乙酸到间苯二氧乙酸，以及改变稀土离子半径Pr~(3+、Eu~(3+)和Ho~(3+)出发，在水热条件下制备了三个系列双核金属单元的稀土羧酸二维配位聚合物1～7。

Compared with rare-earths and their alloys, the perovskite-type manganese oxides exhibit higher chemical stability, higher resistivity that favors a lower value of eddy current loss and lower cost, and would be more suitable candidates for magnetic refrigerants at high temperature, especially the potential for application near room temperature.

与稀土以及稀土-过渡金属的合金比较，钙钛矿锰氧化物具有较高的电阻率有利于降低涡流损耗，以及较低的价格，因而这类材料有可能是高温，特别是室温磁制冷的较好候选者。

The main reason for these was ascribed to the replacement effect of rare earth elements to heavy metal.

实验发现重金属的形态和积累的确受到外加稀土的影响，引起变化的原因主要归结为外加稀土元素发生的替代反应，这种替代作用表明施加稀土肥干扰了土壤中的金属平衡，值得进一步的研究。

By means of UV-vis spectrophotometer, the complex abilities of calix [4] arene ligands with metal ions were researched, and the effect of solvent systems was discussed.

使用紫外-可见分光光度法研究了杯[4]芳烃配体与金属离子的络合性质，并考虑了溶剂对配体与金属离子配位的影响，评价了杯[4]芳烃的不同取代基对过渡金属离子及稀土离子的配位作用。

The giant Bayan Obo REE-Nb-Fe deposit is the world's largest REE deposit,which is hosted mainly by Middle Proterozoic Na-rich rocks,dolomitic rock and K-rich slate.

白云鄂博稀土-铌-铁矿是世界最大的稀土多金属矿床之一，主要产于中元古界富钠岩石、白云岩和富钾板岩中。

The results show that under the follow conditions: pyrolysis temperature 270癈,active carbon and: ethyne black=9:l, carbon pretreated with HNOs, 7.18% Mn(NO3)2(vs. carbon support) catalyst can exhibit the best performance. In order to improve the electrocatalystic performance of MnO2, Pb(CH3COO)2 , La(NO3)3-6H2O and Ce(NO3)3-6H2O are chosen as additives of MnCVC air electrode . Electrochemical performance of the electrodes is studied by current-potential polarization curves.

为了提高催化剂的性能，选择了醋酸铅、稀土作为添加剂，采用稳态极化和交流阻抗测试方法，结果表明：铅的氧化物、稀土La和Ce可作为MnO_2催化剂的助剂来促进氧气还原反应的进行，醋酸铅添加7.5％时极化最小，在一般金属-空气电池的工作电流密度20～50mA／cm~(-2)下，电位比单独MnO_2催化剂可提升30～50mV。

Considering the functions of metal-organic frameworks and the synthesis conditions, we designed and synthesized six metal-organic frameworks based on rare earths by choosing multidentate organic carboxylate ligand, H3CTC, and using mild solvent vapor conditions.

在第二章中，我们利用半刚性的多齿有机羧酸配体——1，3，5-环己三酸与稀土金属元素合成了七个三维具有开放骨架结构的金属有机骨架晶体材料，由于稀土元素在光学和磁学方面的特殊性能，所获得的金属有机骨架材料不仅具有较好的吸附和储存性质，而且拥有金属中心赋予的独特的光学和磁学性能。

The conductive coordinative polymolecular compounds,which contain thetransition metal ions〓and〓as central metal ions,transition metal ionsor rare earth ions as counter cations and〓or〓as ligand,have been synthesized.

合成出以过渡金属〓、〓、〓、〓和〓作为中心金属离子、过渡金属或稀土离子作为抗衡阳离子、有机小分子〓或〓作为配体的导电性配位高分子化合物，它们均为能在空气中稳定存在且难溶和难熔的无定形粉末状固体。

In order to investigate the relationship between the open-chain ligands and metal ions, and the possibility of the metal complexes used as electroluminescent materials, a new naphthol schiff base ligand which is a open-chain crown and its four transition metal complexes, a new amide type tripodal ligand containing heterocyclic ring, two tripodal ligands (H〓L〓 and H〓L〓) containing phenol schiff bases and their rare earth complexes were synthesized and characterized.

为了进一步研究和探讨开链配体与金属离子的配位作用，以及金属配合物作为电致发光材料的可能性，我们设计合成了含萘酚环的Schiff碱开链冠醚H〓L〓及四种过渡金属(Zn、Ni、Co、Cu)配合物，两个含酚羟基的Schiff碱三足配体H〓L〓和H〓L〓及稀土配合物，一个含杂环的酰胺型三足配体L〓，培养了配体L〓的单晶，确定了其晶体结构。

NdFeB,the 3th generation of rare-earth permanent magnet,is produced by powder metallurgical method with neodymium(rare-earth metal),iron and boron.

第三代稀土永磁---NdFeB主要是由稀土材料金属钕和铁及硼通过粉末治金的制造工艺生产而成。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。