Fe_2O_3-PbO-Bi_2O_3系ガラスの電気伝導

概要

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Fe_2O_3-PbO-Bi_2O_3 glasses were prepared by the press-quenching method and their dc conductivities in the temperature range 373-573 K were measured. The glass formation region was found to be Fe_2O_3=0-30 mol%, PbO=0-40 mol%, Bi_2O_3=0-100 mol%. The Seebeck coefficients showed these glasses to be p-type semiconductors. The glasses had conductivities, σ, ranging from 2.82 × 10^<-6> S・cm^<-1> to 2.69 × 10^<-4> S・cm^<-1> at 573 K for Fe_2O_3=20-30 mol%. The dc conductivity increased with increasing Fe_2O_3 content. Electrical conduction was confirmed to be due to nonadiabatic small polaron hopping, and the conductivity was primarily determined by the hopping mobility. The polaron band width, J, ranged from 0.03 to 0.28 eV depending on the Fe-Fe spacing. The IR absorption spectra suggested that the quenched glasses contained FeO_4 tetrahedra and BiO_6 octahedra.
社団法人日本セラミックス協会の論文
1996-11-01