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CuAlO2 exhibits a unique defect structure that is dependent on the synthesis route. Hightemperature solid-state and low-temperature hydrothermal techniques are compared to illustrate how cation off-stoichiometry affects the electrical properties of CuAlO2. A defect complex of Al on a Cu-site stabilized by two bound oxygen interstitials (AlCu2Oi′′)′′ is(More)
Fifteen distinct MgO–V2O5, MgO–MoO3, MgO–V2O5–MoO3, and V2O5–MoO3 compositions were prepared using sol–gel chemistry and their selectivities and conversions for propane oxidative dehydrogenation (ODH) to propylene were measured. The vanadates were more active than the molybdates at lower temperatures; however, the molybdates exhibited higher selectivities(More)
Magnesium orthovanadate crystals (< Φ 5 mm × L 55 mm) with a well-defined crystallographic orientation have been grown successfully in a four-mirror optical floating zone furnace. The crystals grow in the [010] direction. The transparent orange-brown crystals develop a predominant facet along the [20-1] during the crystal growth and cleave along the [20-1](More)
The coexistence of superconductivity and ferromagnetism in 1212-RuSr GdCu O is unique among high-T materials. Samples of 2 2 8 c Ru M Sr GdCu O , with M5Ti, V and Nb; and 0#x#1, were prepared to elucidate the role of the RuO planes in this interesting 1 2 x x 2 2 8 2 layered 1212 cuprate. The solubility ranges of M5Ti and V are limited to x,0.15 whereas(More)
We propose to use shear waves instead of longitudinal waves in a novel scanning tomographic acoustic microscope (STAM) in which the specimens are solid. When a specimen with a shear modulus is immersed in the microscope's water bath, mode conversion takes place at the water-solid interface. The shear wave energy is detectable and can be used for image(More)
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