Phosphorus oxynitride PON, a silica analogue: structure and compression of the cristobalite-like phase; P  - T phase diagram

An Unprecedented AB2 Tetrahedra Network Structure Type in a High‐Pressure Phase of Phosphorus Oxonitride (PON)

“…Since neutron diffraction studies on the known polymorphs of PON by Marchand et al [9,11] did not show any evidence for O/N-order, we assume similar disorder in d-PON. To corroborate this hypothesis, d-PON was characterized further by recording a 31 P solid-state NMR spectrum.…”

“…[1] However, the importance of dense AB 2 networks should not be underestimated. The few known compounds in this system include the first nitridic zeolites NPO [6] and Ba 19 P 36 O 6+x N 66Àx Cl 8+x (x % 4.54) [7] as well as the nitridic clathrate P 4 N 4 (NH) 4 (NH 3 ) [8] and the polymorphs of PON exhibiting cristobalite-, [9] quartz-, [10] and moganite-type [11] structures. [3,4] Owing to the variety of applications, widespread research into novel AB 2 -type structures was conducted, including the prediction of more than two million unique prospective crystal structures for zeolites.…”

Strong anisotropic thermal expansion in cristobalite-type BPO4

“…The high-temperature behavior of several quartz and cristobalite silica analogs ABO 4 (where A=Al 3+ , Ga 3+ , Fe 3+ and B=P 5+ , As 5+ ) and AO 2 (A=Si 4+ and Ge 4+ ) have been reported in the literature [8,[28][29][30][31][32][33][34][35][36]. In all these studies, a greater dependency of inter-polyhedral angles with temperature has been reported.…”

Li14(PON3)2O – A Non‐Condensed Oxonitridophosphate Oxide

“…[4][5][6] Due to the fact that both PON and PN(NH) are isoelectronic to SiO 2 , [7] (oxo)nitridophosphates and silicates often display similar structural features. Many of the well-studied structures of SiO 2 have also been found in PON, such as the cristobalite, [8] quartz, [9] and coesite structure types. [10] Structures comparable to layer and chain silicates are found in Sr 2 P 6 O 6 N 8 [11] and M 2 PN 3 (M = Ca, Mg, Zn).…”