Self-Organized V - Mo Oxide Fibers by the Micro-Pulling Down Method

TL;DR

This study explores the synthesis and properties of V-Mo oxide fibers using the micro-pulling down method, highlighting how processing parameters influence their structure and electrical characteristics.

Contribution

It introduces a method for growing V-Mo oxide fibers with controlled morphology and properties, and provides insights into phase composition and thermodynamic behavior.

Findings

Fibers of eutectic composition successfully grown by micro-pulling down.

Existence of V9Mo6O40 intermediate phase confirmed by X-ray diffraction.

Electrical properties can be tailored by adjusting oxygen partial pressure.

Abstract

The V2O5-MoO3 mixtures offer a whole range of materials where properties can be adjusted by simple modification of experimental parameters, which may be utilized in manufacturing of metamaterials with on-demand properties. The V2O5-MoO3 system contains an intermediate phase V9Mo6O40, with a small fraction of V4+ instead of V5+. Consequently, this system should rather be considered as pseudobinary. The V4+ content depends on the oxygen partial pressure in the atmosphere. Thus, by changing the oxygen partial pressure one can tailor the electric properties of the system, and by changing the supercooling, the morphologic structure of crystallized bodies as well. For better understanding of this system differential thermal analysis and thermodynamic modeling was performed. Fibers of eutectic composition between V9Mo6O40 and MoO3 were grown by the micro-pulling-down technique. X-ray diffraction confirmed the existence of the V9Mo6O40 intermediate phase.