Abstract
The high-pressure and high-temperature behavior of V 2O 5 with a layered-orthorhombic structure was studied by both in-situ X-ray diffraction observations and recovery experiments. Two quenchable high-pressure phases (HPP1 and HPP2) were observed in the pressure and temperature range up to 11 GPa and 700°C. The phase transition to the HPP1 was observed by elevating the temperature above 300°C in the pressure range up to 7 GPa. The HPP1 was found to have an orthorhombic cell ( a= 7.100(7) A ̊ , b= 6.294(5) A ̊ and c= 3.578(2) A ̊ at 0.1 MPa and 27°C. The phase transition to the HPP2 was also observed in an elevating temperature process above 9 GPa. Unit cell parameters of the HPP2 have not yet been determined.
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