Doumerc JP, Yangshu W, Dordor P, Marquestaut E, Pouchard M, Hagenmuller P
摘 要
Electrical conductivity and thermoelectric power of polycrystalline solid solutions of formula Cr 1− x , W 1+ x O 4 were measured between room and liquid helium temperature. The behavior is metallic for the monoclinic WO 2 -type (1⩾ x ⩾0.80) and the tetragonal rutile-type (0.50⩾ x ⩾0.40) phases, whereas the monoclinic CrWO 4 -type phase ( x ⩽0.25) is a semiconductor. The metal-insulator transition is correlated to the increase of the W-W distances observed as x decreases. The evolution of the sign of the thermopower with composition confirms the band diagrams proposed by previous authors. The temperature dependence of the electrical conductivity of the rutile-type phase is interpreted based on recent theories taking into account the role of the inelastic mean free path and the long range electronic correlations in metallic disordered systems.
The metal-non-metal transition in the mixed valency solid solution Cr1−xW1+xO4 
作 者
学科领域 工程技术 » 环境科学
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