That is to say the Miller indices of the crystal phase of Sr (PO3) 2 with their interreticular distances dhkl and the angles of diffraction? And what is the formula for calculating the cell unit parameters of a monoclinic crystal system?
a table with Miller indices, d values and 2 theta positions for monolinic Sr (PO3)2 is attached. The data were calculated in the Vesta program on the basis of 2008913.cif, taken from the COD database. I would probably not recommend calculating the cell parameters manually.
1. Abe, Y. (1979). Abnormal characteristics in crystallization of Ca(PO3)2 glass. Nature (London) 282: 55–56.
2. Abe, Y., Hosoe, M., Kasuga, T. et al. (1982). High-strength Ca(PO3)2 glass-ceramic prepared by unidirectional crystallization. J. Am. Ceram. Soc. 65: C-189–C-190.