Phase transition under pressure?

[new_986]

hello everybody
does always phase undergoes transition when a pressure applied on a crystal ?even when the temperature is constant? and can pressure be increased without increasing temperature for a crystal?

best regards
Nawzad

 

[trurle]

Not always. Some crystals (like ordinary water ice, silver or iron) actually melts if pressure is applied.
Also, it is possible to apply large pressure without temperature rise, but it runs in various technical difficulties because you need long time to dissipate the heat inevitably produced in fast, nearly adiabatic compression.

 

[new_986]

Dear Trurle
Thanks for the reply
I am working on Perovskites semiconductor crystal theoretically, my software doesn't break symmetry automatically, I can increase to very high pressures with the same phase (e.g. cubic)
Do have any idea about Perovskites please ??
Thanks again

Nawzad