Patent ID: 8030247

Claim:
A precursor solution for forming a biaxially oriented buffer layer through low-temperature heat treatment, which comprises: a precursor for forming a buffer layer of YSZ, CeO 2 , RE 2 O 3 (RE=Y, Ce, Sm, Gd or Eu), RE 2 M 2 O 7 (RE=Y, Ce, Sm, Gd or E, M=Zr, Ti or Sn), AMO 3 (A=Sr, Ba or Ca, M=Zr, Ti or Sn); a solvent selected from the group consisting of alcohol liquids, ester liquids, ketones and mixtures thereof; and a metal salt precursor for forming a low melting point oxide selected from among the metal salt of bismuth (Bi), boron (B), lead (Pb), gallium (Ga), lithium (Li), sodium (Na), potassium (K), and cesium (Cs) in an amount of 0.1% ˜30% by mol of a total amount of metal elements included in the precursor solution.