<div dir="ltr"><div>Dear users,</div><div>I tried to perform a vc-relax
calculation for the tetragonal phase of CaSiO3, to obtain equilibrium
parameters and attain zero pressure. Attached below is my input file and
the end part of the output of vc-relax calculation. Please have a look
at the optimized cell-parameters matrix. The non-diagonal elements of
the
matrix are non zero. At the end, for scf calculation I did obtain zero
pressure (0.89 kBar). But how do I calculate optimized lattice
parameters if I have non zero off diagonal elements. Is anything wrong
with my output? Does my input look
fine for CaSiO3 tetragonal structure? I have also performed vc-relax for
cubic and orthorhombic phase of CaSiO3, but there the cell-parameters
matrix obtained had zero diagonal elements.</div><div>Thanks.<br></div></div>