アルコキシド及び水酸化物溶液を用いたゾル-ゲル法によるc軸配向NdBa_2Cu_3O_<7-δ>薄膜の作製

概要

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Superconducting NdBa_2Cu_3O_<7-δ>(Nd123)thin films were prepared by a sol-gel method. Nd- and Ba-alkoxides and Cu(OH)_2 were used as metal sources, and isopropanol and dimethylaminoethanol were used as solvents. Sols were spin-coated on polycrystalline Ag metal substrates, dried at 80°C and finally heated at 800°C, resulting in the formation of single-phase Nd123. The films exhibited preferred orientation along the c-axis after coating two times. However, the orientation was disturbed when the number of coatings increased. This behavior is attributable to the interfacial reaction between the film and the substrate to form liquid phases and/or structural relaxation of the gel film upon heating. Superconducting transition was observed at 90 K after annealing the films in O_2 with superconducting quantum interference device(SQUID)measurements.
社団法人日本セラミックス協会の論文
1999-09-01