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

由于缺乏高效的多用途熔炉，导致我国在固体物理，特别是稀土和铀化合物的基本物理性质方面的优秀研究受到很大的阻碍。在本研究项目中，我们研究开发了一种新型的原装三弧加热炉，在常压氩气中，由独立控制的电源通过三个火炬将旋转水冷炉膛上的起始材料加热并均匀熔化成具有电弧的化合物。在材料合成过程中，先将另一水冷炉底的金属钛或锆经第4电弧炬加热，以除去大气氩气中的杂质氧气，水冷金属炉内壁及炉底周围表面。我们试图使这种新型的特征炉在低生产成本的情况下，在多用途的晶体生长中发挥作用，如在三弧和射频加热下的拉升法。在新炉建成后，我们从1988年开始进一步开展了锕系化合物性能更高的炉的工作。我们还研究了如何在重费米子态下生长高质量的铈化合物单晶。在极低温度下，重费米子态的物理性质对杂质非常敏感。我们可以得出单晶生长质量最好的最终结论如下：采用最高纯度的起始元素和合成后在超高真空中重熔或退火是获得良好单晶的关键。

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.