<div dir="ltr">I think your error is due to the results of
<span style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px">(c11+2c12) = -0.091 (GPa) (also the value of </span>
<span style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px">c12 = -58.679 (GPa)</span><span style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px">) </span> for order of fit=4.<font color="#000000" face="Calibri, Helvetica, sans-serif"><span style="font-size:16px"> Because this value does not satisfy the </span></font>
Born stability criteria. In other words this value should be positive to have the compound with mechanical stability. However, to solve this, I suggest you at first check your input files carefully and then change your volume% (or add other volumes% to your current volumes%) that you select for your current elastic calculations. <div>The best,</div><div>Reyhaneh Ebrahimi</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 8, 2022 at 8:33 AM AJAY SINGH VERMA <<a href="mailto:ajay_phy@hotmail.com">ajay_phy@hotmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg9022377022225488696">
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Dear all,</div>
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While running C_ana_elast_lapw for my compound, I am getting following error given below in order of fit 4. Result for order 2 and 3 is being shown properly. Output order file has been attached.<br>
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Kindly help.<br>
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ORDER OF FIT IS : 4 , At volume = 2365.41197 (bohr^3) ########
<div>(c11-c12) = 175.946 (GPa)</div>
<div>(c11+2c12) = -0.091 (GPa)</div>
<div>(c44) = 1.175 (GPa)</div>
<div>________________________________________</div>
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<div>c11 = 117.267 (GPa)</div>
<div>c12 = -58.679 (GPa)</div>
<div>c44 = 1.175 (GPa)</div>
<div>=======================================================================</div>
<div><br>
</div>
<div>Prediction VOIGT Bulk modulus by using elastic constant values = -.030 (GPa)</div>
<div>Prediction REUSS Bulk modulus by using elastic constant values = (GPa)</div>
<div>Prediction HILL Bulk modulus by using elastic constant values = (GPa)</div>
<div><br>
</div>
<div>Prediction VOIGT Shear modulus by using elastic constant values = 35.894 (GPa)</div>
<div>Prediction REUSS Shear modulus by using elastic constant values = (GPa)</div>
<div>Prediction HILL Shear modulus by using elastic constant values = (GPa)</div>
<div><br>
</div>
<div>Prediction VOIGT Young modulus by using elastic constant values = -.270 (GPa)</div>
<div>Prediction REUSS Young modulus by using elastic constant values = (GPa)</div>
<div>Prediction HILL Young modulus by using elastic constant values = (GPa)</div>
<div><br>
</div>
<div>Prediction VOIGT Poisson's coefficient by using elastic constant values = -1.003
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<div>Prediction REUSS Poisson's coefficient by using elastic constant values = </div>
<div>Prediction HILL Poisson's coefficient by using elastic constant values = <br>
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<div>You can find these data in the output-order file.<br>
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<div><br>
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<div>Thanks and Regards.<br>
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