<報文>天然黄鉄鉱の半導体的特性(第1報) : 主として高温度領域での特性に関して

概要

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Electrical properties of natural pyrite crystals were measured at the temperatures between 730°K and 77°K. From the temperature variation of resistivity in the intrinsic region the energy gap of about 0.73 eV is determined at the temperature range of 650±65°K, and the difference from 0.9 eV reported by Bither et al. is attributed to a temperature dependence of energy gap. The plots of Hall coefficients R_H vs. reciprocal temperatures, by assuming the relation, R_H∝ exp(ΔE_d/kT), give the donor activation energy ΔE_d of about 0.005 eV at the impurity concentration (N_D-N_A) of about 8×10^<16>cm^<-3>, but the smaller values at the higher concentrations. Hall mobility μ_H in the exhaustion region is varied with temperature T in accordance with μ_H∝T^<-1.6>, which is remiscent of an accoustic phonon scattering. As an aid to the research on the flotation adsorption of pyrite, ζ-potentials have also been measured and their relations with the semiconducting properties are considered.
東北大学の論文
1972-11-15