Year: 1999
Type: article
Abstract: Electrical transport and magnetic properties of polycrystalline ceramic specimens of the system La0.9(Sr1−xCax)1.1CoO4 have been investigated as a function of temperature by means of complex-plane impedance analysis which distinguishes the bulk resistivity from the resistivity across grain boundaries, four-probe dc resistivities, Seebeck coefficients and magnetic susceptibilities below room temperature. The temperature dependencies of the magnetic susceptibilities indicate that the ratio of intermediate-spin Coiii ions (S=1) is dominant in a specimen with x=0.1. This suggests that La0.9(Sr1−xCax)1.1CoO4 at x=0.1 has a high potential as a thermoelectric material. Therefore, it is necessary to search for thermoelectric materials in transition-metal perovskites using a spin-state control.
Authors: Hiroshi Nakatsugawa, Eisuke Iguchi
Institution: Yokohama National University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2606901245