Abstract
An oxygen concentration dependent metal-nonmetal (MN) transition was observed for Rb 0.23 WO y with 2.80 3.04, the ρ RT of the Rb 0.23 WO y exhibits a four orders of magnitude increase with a value of 5 Ω cm. Correspondingly, the lattice constant along c-direction slightly shortens as oxygen concentration increases from 2.80 to 3.08. The observed results suggest that the hybridization between W 5d (t 2g ) and O 2p orbitals might be responsible for the MN transition. In addition, similar measurements were performed for Rb x WO 3.04 and Rb x WO 2.85 with 0.19 < x < 0.27. No rubidium concentration dependent MN transition was observed, indicating the electronic structure of the host WO y is not modified significantly by varying the soluble rubidium concentration.
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