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Preparation of Ba 2 YCu 3 O 7‐δ Thin Films with Preferred Orientation through an Organometallic Route
Author(s) -
Hirano Shinichi,
Hayashi Takashi,
Miura Masashi
Publication year - 1990
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.1151-2916.1990.tb05130.x
Subject(s) - thin film , materials science , substrate (aquarium) , stoichiometry , crystallography , epitaxy , dip coating , group 2 organometallic chemistry , crystal structure , analytical chemistry (journal) , coating , chemistry , composite material , nanotechnology , molecule , organic chemistry , layer (electronics) , oceanography , geology
Superconducting Ba 2 YCu 3 O 7‐δ thin films were prepared through an organometallic route. Single‐phase Ba 2 YCu 3 O 7‐δ thin films with preferred orientation were successfully prepared on SrTiO 3 (100) single‐crystal substrates at 800°C by a dip coating method using partially hydrolyzed Ba‐Y‐Cu organometallic solutions. Preferentially oriented Ba 2 YCu 3 ‐O 7‐δ thin films were also prepared on MgO (100) substrates. By controlling the partial hydrolysis conditions, a coating solution for precursor thin films was kept accurately at the stoichiometric composition. The use of ozone gas during the pyrolysis of the precursor thin films was found to suppress the formation of BaCO 3 . Ba 2 YCu 3 O 7‐δ thin films with c ‐axis orientation perpendicular to a SrTiO 3 (100) substrate, which were heat‐treated at 900°C for 15 min, exhibited a superconductivity transition with an onset of 90 K and an end of 75 K.