Thermal Behavior of Zinc Phenylphosphonate and Structure Determination ofγ-Zn2P2O7from X-Ray Powder Diffraction Data

Phase relations and flux research for ZnO crystal growth in the ZnO–B2O3–P2O5 system

“…[21], in which the I2/c structure can be converted into the standard space group C2/c with lattice parameters a = 19.563, b = 8.259, c = 9.099Å and β = 100.2 • . The other phases [22,23] of the 2:1 compound were not obtained in this work. The 1:1 compound was obtained by annealing the vitreous sample with the ZnO:P 2 O 5 molar ratio of 2:3 at 550 • C for 1 day.…”

“…It shows that the ␤-phase may be the disordered phase of the ␣-phase. Katnack and Hummel [17] reported that the ␣-phase inverted rapidly and reversibly to the ␤-phase at 132 • C. The ␥-phase of the 2:1 compound was obtained by the crystallization of an amorphous Zn 2 P 2 O 7 at 480 • C, of which the space group is Pbcm with lattice parameters a = 4.9504(5), b = 13.335(2), c = 16.482(3)Å [23]. The 1:1 compound was reported to have two polymorphic forms of ␣ 1 and ␣ 2 .…”

The structure of binary zinc phosphate glasses

“…The meaning of the peculiar Zn-O coordination in the glasses was discussed well by Brow et al [15] by comparing the reported structures of Zn phosphate crystals [28][29][30][31][32][33][34]. In zinc metaphosphate (50 mol% ZnO) Zn(PO 3 ) 2 and pyrophosphate (66.7 mol% ZnO) bZn 2 P 2 O 7 crystals, all zinc cations are six-coordinated as distorted ZnO 6 polyhedra described as (2 + 2 + 2) coordination rather than octahedral [28,29].…”

The structure of zinc polyphosphate glass studied by diffraction methods and 31P NMR

“…1. The packing densities are compared with values calculated for crystalline (closed triangles) zinc ultraphosphate, ZnP 4 O 11 [24], b-form of zinc metaphosphate, Zn(PO 3 ) 2 [25,26], c-form of zinc pyrophosphate, Zn 2 P 2 O 7 [27], and a-form of zinc orthophosphate, Zn 3 (PO 4 ) 2 [28].…”