Abstract
We report the phase stability of YBa 2 Cu 3 O 7-δ (YBCO) in low oxygen pressure (P O 2 ) region of 1-900 mTorr. For this study, the amorphous Y-Ba-Cu-O precursor films were deposited on LaAlO 3 (LAO) (001) substrate at 200°C by pulsed laser deposition. As-deposited precursor films were annealed at various high temperatures in a given PO 2 , quenched using a reel-to-reel furnace, and then their phases and microstructures were analyzed to accurately determine the stability line of YBCO and its decomposition reaction. The stability line of YBCO in the PO 2 regime of 1-200 mTorr on the PO 2 versus 1/T diagram can be expressed by the equation of Log PO 2 (Torr) = 9.79 - 11 783/T (K -1 ), and the ternary peritectic decomposition of YBCO ↔ Y 2 O 3 + YBa 3 Cu 2 O 6.5 (Y132) + Liquid(L 1 ) occurs at the stability boundary. In 250-900 mTorr, it can be expressed by the equation of Log PO 2 (Torr) = 12.67 - 15 276/T (K -1 ), and the ternary peritectic decomposition of YBCO ↔ Y 2 BaCuO 5 (Y211) + Y132 + Liquid (L 2 ) occurs at the stability boundary.
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