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CASTEP Geometry Optimization Temperature

I have a low temperature single crystal X-ray structure of a compound that exhibits a reversible phase change by DSC at 500K.  I would like to investigate this phase change to see how the structure changes at high temperature.  Is there a way to set the temperature of the cell when performing a geometry optimization or is there a better way to go about determining the new structure?  Also, how do you set the temperature for which thermal ellipsoids are calculated in a PhononDOS calculation?  I can only seem to get them calculated at 298K.