Bi_2O_3-SrO-V_2O_5系ガラス及び結晶化ガラスの電気的性質

概要

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The dc conductivities of Bi203 SrO V205 glasses pre pared by cast quenching, together with that of glass ceramics were measured and the conduction mechan ism has been discussed. It was found that the glass forming region is in the range Bi_2O_3 0-9, SrO 9-50, and V_2O_5 49-87mol% and the glass transition tempera ture, Tg, is in the range 260 360℃. The conductivities of the glasses were ranged from 2.66-8.66×10^<-7> S cm^<-1> at room temperature and the conduction was at tributed to srrall polaron hopping at temperatures higher than 340 K and was changed to variable range hopping at temperatures between 340 and 170 K. The conductivities of the glass cerarnics are about 10^3-10^4 times higher than those of the glasses at 300 K. The conduction of the glass ceramics also showed small polaron hopping at temperatures higher than 170 K, but a mixed conduction of small polaron and variable range hoppings at temperatures lower than 170 K. The disorder energy, W_D, estimated from Mott's parameter analysis in variable range hopping for the various glasses, was evaluated to be 0.15-0.22 eV, which was larger than that for the glass ceramics (0.12-0.15 eV) .
社団法人日本セラミックス協会の論文
1994-05-01