Abstract
Abstract Nonstoichiometric compounds, EuxNbO2+x, were prepared. A cubic tungsten bronze type structure was found in the single phase region of EuxNbO2+x (0.5≤x≤1.0). Magnetic susceptibility measurements showed that the oxidation state of europium in the bronzes was bivalent. The EuxNbO2+x was a metallic conductor in the temperature range 4.2–300 K. Thermoelectromotive force measurements (100–350 K) indicated that the charge carriers were electrons and that the effective mass of the electrons increased with decreasing x in EuxNbO2+x.
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