Crystal structure of ammonium phosphate tellurate Te(OH)6 • 2NH4H2P04, (NH4)2HPO4 (T.A.A.P.) crystal data for two isotypic salts: Te(OH)6, 2KH2PO4, K2HPO4 and Te(OH)6, 2NH4H2AsO4, (NH4)2HAsO4

Te(OH)6 2NH4H2PO4 (NH4)2HPO4 is monoclinic Pn with the following unit cell dimensions: a = 15.66(5), b = 6.314(5), c = 9.818(5) Å, β = 105.49(5)°, Z = 2. The crystal structure has been solved and refined with a final R value .033 for 2531 independent reflections.As in all previously described examples of phosphate-tellurates the main feature of this atomic arrangement is the existence of two different kinds of anion groups TeO6 and PO4 in the unit cell.Crystal data for two isostructural compounds: Te(OH)6 2KH2PO4 K2HPO4 and Te(OH)6 2NH4H2AsO4 (NH4)2HAsO4 are given.