The field of transition metal oxides represents an exciting and rapidly expanding research area that spans the border between the physical and engineering sciences. Molybdenum oxides (MoOx) are one of the most attractive metal oxides due to their special structural characteristics. MoOx comprises two simple binary oxides, namely, MoO3 and MoO2. MoO3 has several polymorphs, such as the thermodynamically stable α-MoO3 (space group Pnma), metastable β-MoO3 (P21/c), -MoO3 (P21/m), and hexagonal metastable h-MoO3 (P63/m). MoO2, with its distorted rutile structure, is an unusual but interesting transition metal oxide because of its low metallic electrical resistivity (8.8 × 10−5 Ω·cm at 300 K in bulk samples), high melting point, and high chemical stability.
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Materials Today (2011) 14(7-8), 346-353