タングステンブロンズを含む高導電性ガラスセラミックス膜の作製と電気的性質

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A series of alkali tungsten bronzes are non-stioichometric compounds having a general formula RxWO_3, where R is H, Li, Na, K and Rb and x is less than unity. They show metallic conduction. The present work was done in order to obtain highly conductive glass-ceramic films containing tungsten bronze and to investigate their electric conductivites. A series of glasses consisted of the compositions containing 30.0-37.5 Na_2O・ 57.5-67.5 WO_3・2.5-10.0 B_2O_3 (in mol% ). About 70 grams batches corresponding to the nominal compositions were melted in alumina crucibles at 1000℃ for 1 h. The melts were rapidly quenched by the twin roller (3000 rpm) to obtain clear glasses without devitrification. Glasses were ground into powders of particle size less 37 μm. Films were prepared by two methods. One was the method by dipping of a quartz glass plate into water dissolved Na_2O-WO_3 - B_2O_3 glasses. The other was the method by melting the glass powders uniformly dispersed on a quartz glass plate in ethanol. Tungsten bronze crystals precipitated from these films when heat-treated in a H_2 atmosphere. These glass- ceramic films were shown to be much higher electric conductivities than the sintered tablet. The maximum conductivity of these glass-ceramic films was about 10^3S/cm at 25℃. The charge carrier of glass-ceramic films was confirmed to be electron by the Seebeck coefficient measurements. The conduction mechanism of glass ceramics was considered to be electronic conduction due to the large polaron.
社団法人日本セラミックス協会の論文
1988-06-01

タングステンブロンズを含む高導電性ガラスセラミックス膜の作製と電気的性質

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