[Pw_forum] reversible transition

[Bipul Rakshit]

Dear PWSCF users,
I am reading one paper Solid State Communications 149 (2009) 689
In which the author study the high pressure phase of Mg2Si, there he
write a sentence

"Both the structural phase transitions are of first-order nature and
are reversible."

But can anybody give me idea, how theoretically we determine whether
the transitions are reversible or not?

thanks
-- 
Bipul Rakshit
PhD Student,
Barkatullah University,
Bhopal 462026,
MP, India