Premium
Interactions between YBa 2 Cu 3 O 7‐ x and K 2 Co 3
Author(s) -
Vassilev G. P.
Publication year - 1995
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170300826
Subject(s) - microprobe , eutectic system , phase diagram , analytical chemistry (journal) , barium , isothermal process , valence (chemistry) , crystallography , annealing (glass) , solid solution , x ray crystallography , phase (matter) , electron microprobe , chemistry , diffraction , materials science , mineralogy , microstructure , inorganic chemistry , thermodynamics , chromatography , optics , composite material , physics , organic chemistry
The interactions between YBa 2 Cu 3 O 7‐ x and K 2 CO 3 have been studied using thermochemical methods, isothermal annealing of diffusion pairs, optical microscopy, X‐ray diffraction, and microprobe analyses. The experiments have shown existence of solubility of YBa 2 Cu 3 O 7‐ x or its constituents in both solid and liquid K 2 CO 3 . The barium ions are preferably dissolved in K 2 CO 3 , whereas potassium cations do not enter massively into the bulk of the YBa 2 Cu 3 O 7‐ x ‐phase. A eutectic‐type phase diagram is supposed for the system K 2 CO 3 –YBa 2 Cu 3 O 7‐ x . The so called “green phase” Y 2 BaCuO 5 and a K–Cu–O compound have been found in the contact zone at 813 °C while a “black phase” layer with nominal composition Y 1.6 Cu 2.8 O 5.4 has grown at 707 °C.