• 한국산학기술학회논문지
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• 제7권5호
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• pp.801-804
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• 2006

[ $YBa_2Cu_3O_{7-{\delta}}(YBCO)$ ]계 초전도 선재용 $GdAlO_3(GAO)$ 버퍼층을 졸-겔(sol-gel) 공정에 의해 제조하였다. 전구체 용액은 Gd 질산염과 Al 질산염을 1:1 화학양론비로 하여 메탄올에 용해하여 준비하였다. 전구체 용액을 $SrTiO_3(STO)$ (100) 단결정 기판위에 스핀 코팅하고, 수분이 포함된 $N_2-5%\; H_2$ 분위기에서 $1000^{\circ}C$에서 2시간 열처리 하였다. 열처리 후 GAO 층의 표면에 대한 주사전자현미경 관찰에 의해 GAO 층이 에피택셜의 특징인 각면 형상을 갖는 것을 알 수 있었다. X-선 회절분석에 의하면 GAO 버퍼층은 c-축으로 우선 배향된 에피택셜 박막으로써 반가폭이 각각 (002)면에서 $0.29^{\circ}(out-of-plane)$, {112}지면에서 $1.10^{\circ}(in-plane)$의 우수한 배향성을 나타내었다.

• 한국세라믹학회지
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• 제43권6호
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• pp.369-375
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• 2006

[ $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{x}Fe_{1-x}O_{3-{\delta}}$ ] [x=0.8, 0.2](BSCF) powders were synthesized by a Glycine-Nitrate Process (GNP) and the electrochemical performance of the BSCF cathode on a scandia stabilized zirconia, $[(Sc_{2}O_3)_{0.11}(ZrO_2)_{0.89}]-1Al_{2}O_3$ was investigated. In order to prevent unfavorable solid-state reactions between the cathode and zirconia electrolyte, a GDC ($Gd_{0.1}Ce_{0.9}O_{2-{delta}}$) buffer layer was applied on ScSZ. The BSCF (x = 0.8) cathode formed on GDC(Buffer)/ScSZ(Disk) showed poor electrochemical property, because the BSCF cathode layer peeled off after the heat-treatment. On the other hand, there were no delamination or peel off between the BSCF and GDC buffer layer, and the BSCF (x = 0.2) cathode exhibited fairly good electrochemical performances. It was considered that the observed phenomenon was associated with the thermal expansion mismatch between the cathode and buffer layer. The ohmic resistance of the double layer cathode was slightly lower than that of the single layer BSCF cathode due to the incorporation of platinum particle into the BSCF second layer.