V_2O_5-Sb_2O_3-TeO_2系のガラスの低温電気伝導

概要

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The dc electrical conductivity of annealed V_2O_5 Sb_2O_3 TeO_2 glasses prepared by quenching was studied. In the high temperature range from room temperature to 473 K, conduction of annealed glasses was confirmed to be due to small polaron hopping. An increase in all nealing time increased the glass density, and decreased the oxygen molar volume, resulting in a decrease in mean V ion spacing. This decrease also caused all increase in polaron band width, and a decrease in hopping energy, W_H. At temperatures lower than room temperature, the relationship between log a and T^<-1/4> was linear. The conductivity analysis based on Mott's variable range hopping (VRH) theory gave disorder energy, W_D = 0.06-0.08 eV (at 250 K) , the density of the states, N(E_F) =1.26×10^<21>-9.30×10^<23> clm^<-3>. eV^<-1> (at 250 K) and the mean distance in VRH, R_<VRH>=(5.26-19.31)×10^<-1>nm (at 250 K). The fact that VRH takes place at such a high temperature as T= 243-293 K was explained by relatively large W_D.
社団法人日本セラミックス協会の論文
1994-09-01