Sb_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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Sb_2O_3-SrO-V_2O_5 glasses were prepared by a cast-quenching method and their electrical conductivity was investigated, together with that of crystallized ones from these glasses. The glass forming region was V_2O_5 65-95, SrO 5-35, Sb_2O_3 0-15 (mol%) with T_g=280°-282℃. The electrical conductivity was in the range from 7×10^<-7> S・cm^<-1> to 10^<-5> S・cm^<-1> at 300 K exhibiting small polaron hopping conduction of electrons. At temperatures lower than room temperature, another mechanism of conduction superposed on that hopping conduction. These glasses and crystallized ones were confirmed to be n-type semiconductors by Seebeck constant measurements. The crystallized glasses gave higher conductivities from 3.3×10^<-4> S・cm^<-1> to 1.8×10^<-2> S・cm^<-1> at 300 K. The relationships between conductivity and temperature showed that the conduction was due to variable range hopping in a temperature range from 100 K to 300 K. Mott's parameter for variable range hopping for these crystallized glasses were evaluated, their disorder energy at low temperature was estimated to be of the order of 0.09-0.11 eV. Discussions led to the conclusion that the conduction of these crystallized glasses was interpreted to be a mixed conduction of small polaron hopping and variable range hopping at temperature between 100 K and 300 K.
社団法人日本セラミックス協会の論文
1992-12-01