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Nb doping effects on crystalline structure, transport transition and magnetic properties are investigated for V1-xNbxO2 (0 ≤ x ≤ 5%) bulks. At room temperature, doping does not change structure of monoclinic phase but causes an increase in lattice parameters for the range of x ≤ 3%, further doping leads to a structure transition to rutile tetragonal phase. Each sample simultaneously displays a transition...
Surface morphological control of the metal-insulator transition behaviors of VO2 epitaxial thin films is achieved by annealing substrates of (0001)-Al2O3 single crystals. The well-defined terraces of the (0001)-Al2O3 substrates are formed by annealing in air at 1200°C. Correspondingly, the surface roughness dramatically decreases in the VO2 epitaxial thin films on the annealed substrates, compared...
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