The preparation and electrical properties are described for cubic NaxWO3 single crystals of the compositions x=0.363, 0.291, and 0.234. Specimens were prepared by diffusing sodium from single crystals of Na0.687WO3. The composition and homogeneity of the crystals were established by x-ray powder and back-reflection Laue photographs. The electrical resistivity-temperature plots show a more complex electronic behavior than had been expected for dilute NaxWO3 on the basis of earlier work; Na0.291WO3 and Na0.234WO3 exhibit resistivity minima at about 150° and 320°K, respectively, with characteristics similar to that of degenerate semiconductors. A polycrystalline sample of Na0.025WO3, having a room-temperature resistivity of 3×10—3 ohm cm and a Seebeck coefficient of —270 μv/deg, is also described.
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McNeill et al. (1962) studied this question.
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