<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:16px"><div id="yui_3_16_0_1_1445235245458_3379">Dear Wien2k users,</div><div id="yui_3_16_0_1_1445235245458_3379">Can you guide me for finding equations of elastic constants under pressure?</div><div id="yui_3_16_0_1_1445235245458_3379">For example for cubic compounds and for finding C44 under strain as:</div><div id="yui_3_16_0_1_1445235245458_3379"> 1 delta 0</div><div id="yui_3_16_0_1_1445235245458_3379"> delta 1 0</div><div id="yui_3_16_0_1_1445235245458_3379"> 0 0 1/(1-delta^2)</div><div id="yui_3_16_0_1_1445235245458_3379"><br></div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">the equation will be as:</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">E(V,delta) = E(V0,0)+V0(2C44*delat^2 + O(delta^4))</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr"><br></div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr"><br></div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">and now, i would like to know how i must correct this equation or other equations under pressure.</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">Please guide me</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr"><br></div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">Sincerely,</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr">Amir</div><div id="yui_3_16_0_1_1445235245458_3379" dir="ltr"><br></div></div></body></html>