氧化镨

In North China, price of praseodymium neodymium oxide, a major RE variety rose 50%; that of cerium oxide grew 40%; and that of lanthanum oxide, 27%. In South China, price of dysprosium oxide rose 65%; that of terbium oxide, 69%; and that of europium oxide, 12%.

其中北方稀土主要品种氧化镨钕上涨 50%，氧化铈上涨40%，氧化镧上涨27%；南方主要品种涨幅更大，氧化镝上涨65%，氧化铽上涨69%，氧化铕上涨12%。

Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。

This method could also be applied to prepare praseodymium oxides, however, it was not successful in preparing other light rare earth oxides.

这种方法可以应用到制备氧化镨，但是，无法成功应用到制备其他轻稀土氧化物。

Finally, a SONOS-type memories by using high-κ dielectric materials Praseodymium oxide trapping layers was proposed and demonstrated.

最后，我们使用另一种高介电常数材料当捕陷层制作出了SONOS型非挥发性快闪记忆体，此材料为氧化镨。

Since this year, RE prices have increased obviously, and offered price for praseodymium neodymium oxide now averages at about RMB181,000/ton, up 38.16% from the beginning of this year.

今年以来稀土价格明显上涨，目前稀土品种中氧化镨钕平均报价在18.1万元人民币/吨左右，比年初上涨38.16%。

The influence of electrolyte composition,electrolysis temperature, cathode current density and feedrate on the production efficiency is discussed.

对电解氧化镨制取金属镨的小型试验和3000A电解槽的生产作了简要介绍，探讨了电解质组成、电解温度、阴极电流密度、加料速度对工业生产效果的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。