Rare earth-transition metal alloy permanent magnet materials: 1960–1985

Rare earths, primarily light rare earths, either alone or in combination with other rare earths, as in misch metal, alloyed with cobalt or iron, constitute a unique new class of permanent magnet materials with outstanding coercivity and other magnetic properties. These materials represent the first serious alternative to the alnicos and ferrites, discovered earlier. The intensity of interest in this field may be judged by the presence of over 800 publications which have appeared in the 25 years since their discovery and by the fact that the publication rate remains unabated. The present bibliography includes a listing of references by year and indexes based on subject, material and author.     

Application of Rare Earths in Thermal Barrier Coating Materials

Rare earths are a series of minerals with special properties that make them essential for applications including miniaturized electronics, computer hard disks, display panels, missile guidance, pollution controlling catalysts, H2-storage and other advanced materials. The use of thermal barrier coatings （TBCs） has the potential to extend the working temperature and the life of a gas turbine by providing a layer of thermal insulation between the metallic substrate and the hot gas. Yttria （Y203）, as one of the most important rare earth oxides, has already been used in the typical TBC material YSZ （yttria stabilized zirconia）. In the development of the TBC materials, especially in the latest ten years, rare earths have been found to be more and more important. All the new candidates of TBC materials contain a large quantity of rare earths, such as R2Zr207 （R=La, Ce, Nd, Gd）, CeO2-YSZ, RMeAI11019 （R=La, Nd; Me=Mg, Ca, Sr） and LAP04. The concept of double-ceramic- layer coatings based on the rare earth materials and YSZ is effective for the improvement of the thermal shock life of TBCs at high temperature.     

新型防护电磁波信息泄漏材料的研究进展

对新型防护电磁波信息泄漏材料的研究现状进行了综述.重点介绍和评述了非晶材料、纳米材料、手性材料和稀土材料在电磁波信息泄漏防护材料中的研究进展.     

Superconducting and magnetic properties of ternary silicides in some rare earth-noble metal (Rh or Ir)-silicon systems

New families of ternary silicides have been prepared in the RE - Rh or Ir -Si systems and the crystal structures have been determined: RERh₃Si₂, RE₂Rh₃Si₅, RE₂RhSi₃ (RE = Y, La → Er), RERhSi (Y, La, Gd → Er), REIrSi (RE = La, Ce, Nd), RERhSi₂ and REIrSi₂ (RE = La → Gd). The RE₂RhSi₃ compounds crystallize with a new structural type, the other ones are isostructural with already known silicides or borides. Some of the silicides studied whose rare earths are diamagnetic (Y, La) show superconducting transitions above 1.6 K. They have been compared with other superconducting ternary borides, silicides, germanides and phosphides containing rare earths and noble metals. Except the phases with Y and La which are diamagnetic or show Pauli paramagnetism, the other materials order magnetically at low temperature. The onset of magnetic transitions vs. field has been observed for some compounds below 20 kOe at 4.2 K.     

Liquid phase epitaxy: A versatile technique for the development of miniature optical components in single crystal dielectric media

In this paper we will review the possibilities of liquid phase epitaxy (LPE) as a versatile technique for the development of new miniature optical components in single crystal dielectric media. These LPE layers can be used in active waveguide configuration as laser or amplifier sources or in transverse configuration as saturable absorber deposited on an active layer. So in the first part of this paper, we will present the LPE process by describing the growth conditions of rare earths doped YAG layers and by discussing the properties obtained in laser planar waveguides. In a second part, we will discuss some other applications, as amplifiers or saturable absorbers, using LPE layers. In the third and last part, we will present the interest of LPE for other materials, used as laser waveguides.     

复合阻尼材料最新研究进展

介绍了复合阻尼材料研究的最新进展,包括阻尼赋予剂、压电阻尼材料和稀土永磁阻尼材料等3种新型复合阻尼材料,同时评述了相关阻尼机理及阻尼性能的评价方法等.     

稀土丝喂入位置对连铸板坯质量影响的研究

针对结晶器喂稀土丝生产的连铸板坯热轧后钢板表面出现龟纹缺陷技术难题，在分析该缺陷形成原因的基础上，开展了中间包喂稀土丝工艺试验，结果表明：与结晶器喂稀土的连铸坯相比，中间包喂稀土连铸板坯横断面上的稀土夹杂物大多呈细小颗粒状均匀分布，冲击韧性更高，热轧后钢板未出现表面缺陷，中间包喂稀土工艺彻底解决了结晶器喂稀土存在的质量问题，使稀土使用得以更充分地挥，板坯质量更好。     

稀土改性玻璃纤维对PTFE复合材料摩擦磨损性能的影响

分别用硅烷偶联剂SG-Si900(SGS)、含SG-Si900的稀土溶液(SGS/RES)和稀土溶液(RES)对玻璃纤维进行表面改性,考察了稀土改性玻璃纤维填充的PTFE复合材料在油润滑条件下的摩擦磨损性能,并用扫描电子显微镜(SEM)分析了磨损表面形貌.结果表明:与未经表面改性玻璃纤维填充的PTFE复合材料相比,经表面改性玻璃纤维填充的PTFE复合材料的减摩耐磨性能得到提高,以RES的作用最明显,SGS/RES次之,SGS第三;在油润滑条件下,稀土改性玻璃纤维填充的PTFE复合材料只出现了轻微磨损,这是由于玻璃纤维经稀土表面改性后极大地改善了玻璃纤维与PTFE基体之间的界面结合力,使稀土改性玻璃纤维填充的PTFE复合材料具有优异的摩擦磨损性能.     

NaZn13型LaFe基室温磁致冷材料研究进展

介绍了LaFe基室温磁制冷材料在制备和磁热效应方面的研究进展.具有NaZn13型结构的LaFe基化合物中含有高的Fe含量,是良好的软磁材料.LaFe基化合物的居里温度可以通过Co取代Fe或添加非金属元素H、C、B等来提高;应用甩带和其他稀土元素取代La可以缩短制备NaZn13的退火时间.通过调整LaFe基化合物的元素配比可能会制备出具有巨磁热效应的室温磁制冷材料.     

Rare earth-doped nanocrystalline MgF2: Synthesis,luminescence and thermoluminescence

The radioluminescence (RL) and thermoluminescence (TL) activation of MgF₂ through the incorporation of rare earths is investigated in this work. These materials were obtained by ligand-free solution precipitation and calcination at 500 °C in air, and Ce, Eu and Tb were incorporated at the 1 mol% level. RL results of doped and undoped materials seem to indicate that the incorporation of rare earths creates effective luminescence centers, which is accompanied by an increase in the TL signal intensity in comparison with the undoped material. In particular, RL emission of MgF₂:Ce is reported to be centered at 325 nm. The traps associated with the TL signal were found to be unstable under exposure to room light, suggesting potential for applications involving optically stimulated luminescence.