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Developemental Search on the Crystal Growth Tequnique of the qualified single Crystal of Cerium Compounds by a newly Constructed Arc-Furnace.

新建电弧炉生长合格的铈化合物单晶技术的开发研究。

基本信息

批准号：
62840005
负责人：
KOMATSUBARA Takemi
金额：
$ 3.71万
依托单位：
TOHOKU UNIVERSITY (1988)University of Tsukuba (1987)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

The lack of the highly efficient multi-purpose furnace causes great deley in exellent research about the basic physical properties on the solid state physics, especially in rare earth and uranium cpompounds in our country. In this research projict, we have investigated developementally for a new original tri-arc heating furnace, where the starting materials on the rotating water-cooled hearth are heated and melted homogeniously into a compound with arcs through three torches by the power suppliers controlled independently in the atmospheric argon gas. On the way to the material synthesis, titanim or zirconium metal on the another water-cooled hearth is beforehand heated by the 4th arc torch for removal of the impurity oxgen gas from the atmosheric argon gas, the inside wall of water-cooled metallic furnace can and the surface around the hearth.We have Tried to make the new chracteristic furnace in low production cost and to be usefull for crystal growth in a multi-purpose such as the pullinf-up method under the tri-arc and rf heatings. After the construction of the new furnace, we have proceeded further with the work as a higher performance furnace properties of actinide compounds started from 1988.We have also studied how to grow the single crystal with high guarity cerium compounds in the heavy fermion state. The physical properties of the heavy fermion state is very sensitive to the impurity at very low temperatures. We can reach a final conclusion for single for single crystal growth with the best quality as follows; the use of the starting elements in the highest purity and the remelting or annealing in an ultra high vacuum after systhesis are most essential to get a good single crystal.

由于缺乏高效的多用炉，使我国固体物理特别是稀土和铀化合物的基础物理性质的深入研究受到很大的阻碍。在本研究计画中，我们开发了一种新的原始三弧加热炉，其中在旋转的水冷式炉膛上的起始材料通过三个独立控制的电源在氩气气氛中通过电弧加热并均匀熔化成化合物。在材料合成的途中，另一个水冷炉床上的钛或锆金属被第四个电弧炬预先加热，以从气氛氩气中除去杂质氧气，本文介绍了一种新型的水冷金属炉，它是在水冷金属炉内壁和炉膛周围表面上进行的，它的特点是生产成本低，并可用于多晶炉的晶体生长。例如在三弧和RF加热下的上拉方法。新炉建成后，我们又进一步开展了从1988年开始的高性能锕系化合物炉性能的研究工作，并研究了在重费米子态下生长高质量铈化合物单晶的方法。在极低的温度下，重费米子态的物理性质对杂质非常敏感。我们可以得出一个最终的结论，为单晶生长的最佳质量如下：使用最高纯度的起始元素和重熔或退火后，在超高真空合成是最重要的，以获得一个良好的单晶。