<DIV> </DIV>
<DIV> Dear All,</DIV>
<DIV> I want to fix the lattice parameters to optimize the structure, but i don't know how to achieve. What should be added in input file.</DIV>
<DIV> </DIV>
<DIV>Best regards,</DIV>
<DIV>Junjie Wang</DIV>
<DIV> </DIV>
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