CAJ | 학술논문

在常规Al2O3刚玉坩锅内表面制备BaZrO3保护层的方法生长YBa2Cu3O7-δ高温超导单晶.实验结果显示，在晶体生长过程中，这种BaZrO3薄层确实可以有效地阻止坩锅材料中的Al向Y2O3-BaO-CuO溶液的扩散，且生长出的YBa2Cu3O7-δ晶体中，在仪器精度范围内没有发现Al杂质的存在.刚刚生长没有进行氧退火处理样品具有四方对称性，晶格常数分别为a=0.385 86 nm，b=0.385 83 nm，c=1.179 31 nm，α=β=γ=90°.简单氧气氛下热处理后，超导转变温度由45 K提高到84 K.
재상규Al2O3강옥감과내표면제비BaZrO3보호층적방법생장YBa2Cu3O7-δ고온초도단정.실험결과현시，재정체생장과정중，저충BaZrO3박층학실가이유효지조지감과재료중적Al향Y2O3-BaO-CuO용액적확산，차생장출적YBa2Cu3O7-δ정체중，재의기정도범위내몰유발현Al잡질적존재.강강생장몰유진행양퇴화처리양품구유사방대칭성，정격상수분별위a=0.385 86 nm，b=0.385 83 nm，c=1.179 31 nm，α=β=γ=90°.간단양기분하열처리후，초도전변온도유45 K제고도84 K.
We develop a novel technique of the solution for the crucible corrosion problem during the single crystal growth of high-Tc superconducting YBa2Cu3O7-δ, i.e. coating a layer of BaZrO3 on Al2O3 crucibles to handle the diffusion of Al to melt of Y2O3-BaO-CuO. The coating material is a polymer-compound containing BaZrO3. The experimental results show that the contamination from Al2O3 crucibles can be greatly reduced by this kind of coating BaZrO3 layer. The effectiveness of the BaZrO3 layer is found to depend on the sintering conductions. For the crystals grown in the Al2O3 Crucibles with a coated BaZrO3 layer prepared at a high sintering temperature (1　400～1　500 °C) and a long sintering time (48 h)， the composition YBa2Cu3O7-δ is confirmed and the aluminum contamination is not detectable. The as-grown crystals show tetragonal symmetry with the lattice constants: a=0.385　86 nm, b=0.385　83 nm, c=1.179　31 nm; and α=β=γ=90°. After oxygen annealing, the superconducting transition temperature Tc of the crystal increases from 47 K to 84 K.