金属ラウリン酸塩の塗布熱分解によるBa2_YCu_30_<7-σ>超伝導薄膜の合成

概要

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Superconducting Ba_2YCu_3O_<7-δ> (BYCO) films were prepared on the yttria-stabilized zirconia substrates by the dipping-pyrolysis process using metal laurates as starting materials. Propionic acid and pyridine were selected as solvents based on the screening test on solubility of each of Ba-, Y- and Cu-laurates in 26 organic liquids with various functional groups. A homogeneous solution of mixed laurates (Ba : Y : Cu=2 : 1: 3) was prepared by using a mixture of propionic acid and Pyridine. This solution was spin-coated on the YSZ substrates and preheated at 500℃ in air to make (BaCO_3- Y_2O_3-CuO) precursor films. After this procedure was repeated 15 times, the precursor films were heat-treated at 925°-970 ℃ in O_2 to give 2 μm thick BYCO films, which showed superconduction at T_<c, zero> of 69-84 K. Observation with a scanning electron microscope and X- ray diffraction analysis showed dense textures of orthorhombic BYCO grains.
社団法人日本セラミックス協会の論文
1990-02-01