ELECTROPHYSICAL PROPERTIES OF SOLID SOLUTIONS NiO – ZnO

Abstract

Regularities of changes in the electrical conductivity of solid NiO – ZnO solutions in the temperature range of 20– 700°C were studied. It was found that all the compositions of solid solutions have a negative temperature coefficient of resistance. The change in electrical resistance is 3-4 orders of magnitude. Solid solutions of NiO(ZnO) are stable under thermal treatment up to 700°C, and changes in electrical resistance upon the heat treatment do not occur. Solid solutions of ZnO(NiO) decompose at temperatures above 350°C. Decomposition occurs by the diffusion mechanism with the formation of two new phases of solid solutions. Solid solutions of NiO – ZnO have the values of coefficients of temperature sensitivity 4000–11000 K. Solid solutions of NiO(ZnO) are perspective for use in temperature sensors and thermistors.

Keywords

• solid solutions, resistivity, stability phases.