[Wien] about Murnaghan's EOS equation

[段鹤]

Dear Prof. Stefaan, 

I would like to very much thank you for your detailed expainations. But I'am 
still a little confused regarding why the Murnaghan EOS equation can be 
widely used as the fitting functions for evaluating the equilibrium lattice 
constant in most First-princiles code. Probably this equation is more 
appropriate formula mathematically and meaningful in a physical sense 
compared with other equations. Could you please tell me in a little more 
details about this? Also is there any references? Thank you very much.
With best regards,

He Duan, PhD
Room 24309, National Laboratory for Infrared Physics
Institute of Technical Physics
Chinese Academy of Sciences
500 Yutian Road
Shanghai, 200083, China
E-mail: duanhe at mail.sitp.ac.cn