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Three phosphates with (NaM II PO 4 )  x   composition have been synthesized and characterized structurally. The low temperature modifications of NaMgPO 4  and Na 2 CaMg(PO 4 ) 2  crystallize in the orthorhombic space group  P 2 1 2 1 2 1 , and the monoclinic space group  P 2 1 / c , respectively. The phase transitions at high temperature were investigated by thermal analysis and powder diffractometry. The high-temperature modification of Na 2 CaMg(PO 4 ) 2  is isotypic with glaserite, K 3 Na(SO 4 ) 2  as determined by Rietveld refinement. Na 18 Ca 13 Mg 5 (PO 4 ) 18  crystallizes in the trigonal space group  R [unk] m . The structures of all of these phosphates can be related to the arrangement of cations and phosphate tetrahedra in the glaserite structure.

The crystal structures of NaMgPO 4 , Na 2 CaMg(PO 4 ) 2 and Na 18 Ca 13 Mg 5 (PO 4 ) 18 : new examples for glaserite related structures