Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the -Ex Situ BaF2- Process
Winnie K. Wong-Ng, Makoto Otani, Lawrence P. Cook, Mark D. Vaudin, James P. Cline, Ron Feenstra, T G. Holesinger
In situ x-ray diffraction was used to establish the phase relations in high-Tc superconductor BaY CuO films grown on SrTiO3 through the ex situ BaF2 process. These relations differ from bulk equilibrium phase assemblages in the BaOY2O3CuOx system. In particular, BaY2CuO5 the green phase, a common impurity phase in bulk processing, is absent in the films. Because of the absence of this green phase, the compositional stability field of Ba2YCu3O6+x expands considerably as compared to that of the bulk system, resulting in the tie lines Ba2YCu3O6+xY2O3 and Ba2YCu3O6+xY2Cu2O5.
, Otani, M.
, Cook, L.
, Vaudin, M.
, Cline, J.
, Feenstra, R.
and Holesinger, T.
Phase Relations in the Ba-Y-Cu-O Films on SrTiO3 for the -Ex Situ BaF2- Process, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=854349
(Accessed November 30, 2023)