<div style="color:rgb(34,34,34);font-size:12.499999046325684px;font-family:arial,sans-serif">Thanks for reply </div><div style="color:rgb(34,34,34);font-size:12.499999046325684px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:12.499999046325684px;font-family:arial,sans-serif">but i m now sure that it is a third order birch-murnaghan equation. it needs correction</div>
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it is also given in this paper</div><div style="color:rgb(34,34,34);font-size:12.499999046325684px;font-family:arial,sans-serif">Achieves of material science and emerging. vol 45, 2010, 108-113.</div>
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<br></div>Karandeep<br>Research Scholar<br>Physics Department,<br>IIT,  Delhi<br>