Physical properties of V$_{1-x}$Ti$_{x}$O$_{2}$ (0 $<$ x $<$ 0.187) single crystals

TL;DR

This study investigates the structural phase transitions of pure and Ti-doped VO$_{2}$ single crystals, revealing how Ti doping influences the transition temperatures and phases, with potential implications for electronic and material applications.

Contribution

It provides new insights into the phase behavior of Ti-doped VO$_{2}$ single crystals and details their growth and phase transition characteristics.

Findings

Pure VO$_{2}$ exhibits a first-order phase transition at 340 K.

Ti doping introduces a new monoclinic M2 phase.

Transition temperatures between phases are affected by Ti concentration.

Abstract

Free standing, low strain, single crystals of pure and titanium doped VO$_{2}$ were grown out of an excess of V$_{2}$O$_{5}$ using high temperature solution growth techniques. At $T_{MI} \sim$ 340 K, pure VO$_{2}$ exhibits a clear first-order phase transition from a high-temperature paramagnetic tetragonal phase (R) to a low-temperature non-magnetic monoclinic phase (M1). With Ti doping, another monoclinic phase (M2) emerges between the R and M1 phases. The phase transition temperature between R and M2 increases with increasing Ti doping while the transition temperature between M2 and M1 decreases.