I have calculated Y2SiO5 with monoclinic system (Y1-Y2 two site, unique Si site and O1, O2, O3, O4 and O5 five site). Thus, I have used these parameters as a input file descriptions;

Monoclinic P, unique axis b

ibrav=13

celldm(2) = b/a

celldm(3)= c/a

celldm(5)=cos (ac) where beta is the angle between axis a and c

Dou you any comment for these chosen inputs

Many thanks

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