Abstract

Results from the present work on the preparation of Mn-Co-Ni-O thin films from. the corresponding metal naphthenates mixed solution by a dip-coating method are summarized as follws:(1) The metal naphthenates decomposed thermally to become mixed oxides upon heat treatment at 450°C.(2) A Mn-Co-Ni-O thin film of an appropriate composition for use as a thermistor has been prepared from the mixed metal naphthenates by further heating at temperatures above 700°C.(3) The as-prepared thin film almost completely crystallized to form a complex spinel phase, a solid solution of MnCo2O4 and NiMn2O4, by further heat treatment at temperatures above 700°C for 1h.(4) The sheet resistance of the film was markedly lowered after heat treatment at temperatures above 600°C.(5) The B constant of the thin film is slightly higher than that of the bulk of the same compositions

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