LAUSR

Abstract The structure and electrical transport properties of molybdenum dioxide (MoO2) under high pressure were studied by X-ray diffraction, in situ Hall effect and variable temperature electrical resistivity measurements. The X-ray diffraction measurements revealed two structural phase transitions at 14.3 GPa and 22.6 GPa, and unusual changes in the electrical parameters with pressure were attributed to these transitions. The internal conduction mechanism of MoO2 under compression was explained by the Hall mobility and charge carrier concentration. The abnormal changes in the temperature coefficient reflected changes in the lattice thermal vibration trend. MoO2 keeps a low temperature coefficient up to 34.4 GPa, showing good stable electrical transport performance. The results of this study will help guide the future development of pressure-modulated devices based on MoO2.