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Influence of Iron Doping on the Microstructure of YBa 2 (Cu 1−x Fe x ) 3 O 7−δ Ceramics
Author(s) -
Diko Pavel,
Duvigneaud Paul.H.,
Lanckbeen Alain,
Moer André,
Naessens Georges,
Deltour Robert
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb04027.x
Subject(s) - materials science , orthorhombic crystal system , sintering , microstructure , tetragonal crystal system , analytical chemistry (journal) , ceramic , grain growth , porosity , doping , phase (matter) , grain boundary , grain size , mineralogy , metallurgy , crystallography , chemistry , crystal structure , composite material , optoelectronics , organic chemistry , chromatography
Porosity, grain growth, phase composition, and microstructural defects were studied in sintered YBa 2 (Cu 1−x ) 3 O 7−x ceramics for x values up to 0.3. The porosity of the samples, related to the sintering mechanism, was independent of iron concentration. A linear dependence of the grain size with the inverse of the iron concentration was found, strongly suggesting grain boundary segregation of iron. The solubility limit was estimated to be x = 0.18 at 950°C in O 2 . Beyond this limit, a new microstructural component was found consisting of YBa 2 (Cu 1−x Fe x ) 3 O 7−δ , YBaCuFeO 5 and Ba(Cu,Fe)O 2 . The transition from an orthorhombic twin to an orthorhombic tweed phase and a tetragonal phase was detected by polarized light microscopy.