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Crystalline characteristics and superconducting properties of Bi2212 thin films prepared by the Pechini sol–gel method: the effect of different substrates on the film growth
Author(s) -
Lu Xiaoming,
Miao Xuejiao,
Sun Dalu,
Shahzad M. Babar,
Qi Yang
Publication year - 2015
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576714025175
Subject(s) - materials science , epitaxy , crystallization , thin film , phase (matter) , spin coating , superconductivity , chemical engineering , analytical chemistry (journal) , nanotechnology , layer (electronics) , chemistry , condensed matter physics , organic chemistry , physics , engineering
Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) superconducting thin films were prepared by the Pechini sol–gel method using nitrates as reactants. The precursor sol was deposited on LaAlO 3 (100) and MgO(100) single‐crystal substrates via the spin‐coating method. The results revealed that the phase formation temperature region of the pure Bi2212 phase and perfectly epitaxial Bi2212 films deposited on LaAlO 3 substrates was significantly expanded to 8 K, indicating an improvement in crystallization of Bi2212 films. In addition, the phase formation temperature region of the pure phase and c ‐axis‐grown Bi2212 films deposited on MgO substrates was reduced to 5 K because of the deterioration of epitaxy of Bi2212 films sintered at higher temperature. According to the investigation, the T c,onset values of Bi2212 films grown on MgO substrates were about 92 K. Meanwhile, the optimal T c,onset value of Bi2212 superconducting films grown on LaAlO 3 substrates rose to 96 K.