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X‐ray crystal structures of Al‐doped (Y,Ca)Ba 2 Cu 3 O 7− y whiskers
Author(s) -
Bertolotti Federica,
Calore Leandro,
Gervasio Giuliana,
Agostino Angelo,
Truccato Marco,
Operti Lorenza
Publication year - 2014
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520613029351
Subject(s) - orthorhombic crystal system , tetragonal crystal system , materials science , crystallography , crystal structure , doping , whiskers , x ray crystallography , ion , copper , crystal (programming language) , aluminium , diffraction , analytical chemistry (journal) , chemistry , metallurgy , optoelectronics , optics , composite material , programming language , physics , organic chemistry , computer science , chromatography
Al +3 ‐doped (Y,Ca)Ba 2 Cu 3 O 7− y (YBCO) whiskers have been synthesized using a solid‐state reaction technique. These materials are promising candidates for solid‐state THz applications based on sequences of Josephson Junctions (IJJs). Alumina addition was systematically varied and the effect of aluminium incorporation on the structure has been investigated using single‐crystal X‐ray diffraction. Aluminium only replaces Cu atoms in the O–Cu–O–Cu chains and a gradual transition from orthorhombic to tetragonal space group occurs, thus increasing the Al content. A gradual modification of the coordination sphere of the copper site has also been observed. The Ca 2+ ion substitutes mainly the Y 3+ ion and also, to a small extent, the Ba 2+ ion.