i am calulated b1 to b2 transition of some metal carbide i found b1 to b2 transition at 140 gpa from phonon dispersion i found dyanamical unstabilty at 140 gpa b1 phase but i am also found b2 is dyanamical unstable(in X and M) directions so i thought there must be other phase which may be stable at 140 gpa for this calculated L10 phase which will less enthalpy than b2 at 140 gpa but also this shows imaginary frequency in X direction so what is the stable phase?
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