Synthesis of niobia nanocrystals with controlled morphology

Article Abstract:

A study describes how TT niobia-phase nanocrystals with controlled morphology were obtained by the hydrothermal treatment of a niobium peroxo complex precursor at very low temperatures. The materials obtained by this route present a very high surface area, ranging from 79 to 327 mg2/g, disordered Nb[O.cub.6], Nb[O.sub.7], and Nb[O.sub.8] polyhedra, Nb-O superficial sites, and a superficial OH group, which must have ensured the acidic characteristics of this oxide.

Analysis, Observations, Transmission electron microscopes, Chemical synthesis, Structure

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Electrical properties of niobium-doped titanium dioxide: 1: Defect disorder

Article Abstract:

The electrical conductivity and thermoelectric power for Nb-doped Ti[O.sub.2] are reported at elevated temperatures in the gas phase of controlled oxygen activity. The equilibrium constant is determined for the formation of oxygen vacancies and titanium vacancies for Nb-doped Ti[O.sub.2] and the results have shown that in reduced conditions the Nb-doped Ti[O.sub.2] exhibits metallic-type conductivity.

Methods, Titanium dioxide, Semiconductor doping

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Growth of SnO nanobelts and dendrites by a self-catalytic VLS process

Article Abstract:

SnO nanobelts and dendrites were prepared by a self-catalytic vapor-liquid-solid (VLS) process using a carbothermal synthesis approach and investigated. The results indicated that the nanobelts were single crystalline and had a width/thickness ratio of 4 to 12 and the nanobelts grew in the [110] direction of orthorhombic structure of SnO.

Science & research, Research, Dendrites, Tin compounds, Phase rule and equilibrium, Phase equilibrium

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