Phase equilibria in the ternary system: MgO---Na2O---P2O5; Partial system: Mg3 (PO4)2---Mg4Na(PO4)3---Na4P2O7---Mg2P2O7

X-ray powder diffraction data are reported for a series of multipyrazole compounds in this paper. This work shows that the unit cell dimensions determined by single crystal agree well with those of powder diffraction analysis.