DFabrication of $GdAlO_3$ Buffer Layers by Sol-Gel Processing

졸-겔법에 의한 $GdAlO_3$ 버퍼층의 제조

  • 방재철 (순천향대학교 신소재공학과)
  • Published : 2006.10.31

Abstract

[ $GdAlO_3(GAO)$ ] buffer layer for $YBa_2Cu_3O_{7-{\delta}}(YBCO)$ coated superconductor wire was fabricated by sol-gel processing. Precursor solution was prepared by dissolving 1:1 stoichiometric quantaties of gadolinium nitrate hexahydrate and aluminum nitrate nonahydrate in methanol. The solution was spin-coated on $SrTiO_3(STO)$(100) single crystal substrates and heated at $1000^{\circ}C$ for 2h in wet $N_2-5%\; H_2$, atmosphere. A SEM(scanning electron microscopy) observation of the surface morphology of the GAO layer has shown that it has a faceted morphology indicating epitaxy. It was shown from x-ray diffraction(XRB) that GAO buffer layer was highly c-axis oriented epitaxial thin film with both good out-of-plane($FWHM=0.29^{\circ}$ for the (002) reflection) and in-plane ($FWHM=1.10^{\circ}$ for the {112} reflection) alignment.

Keywords

Sol-gel;$GdAlO_3$ buffer layer;$YBa_2Cu_3O_{7-{\delta}}$ coated superconductor wire