Phase transition under pressure?

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SUMMARY

Phase transitions in crystals can occur under pressure without a change in temperature, but this is not universally applicable. Certain crystals, such as water ice, silver, and iron, will melt when pressure is applied. While it is feasible to apply high pressure without increasing temperature, this process presents technical challenges due to heat dissipation during rapid compression. The discussion also highlights the specific case of Perovskite semiconductor crystals, where symmetry breaking is not automatically handled by the software used for theoretical modeling.

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  • Knowledge of crystal structures, specifically Perovskites
  • Familiarity with thermodynamics, particularly adiabatic processes
  • Experience with computational modeling software for crystal analysis
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  • Research the properties and applications of Perovskite semiconductors
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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
 
Last edited:
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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.
 
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
 

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