The Stuffed Framework Structure of BaGa2O4

The Stuffed Framework Structure of SrP2N4: Challenges to Synthesis and Crystal Structure Determination

“…Furthermore, a series of nitridosodalites [11][12][13][14][15] and oxonitridosodalites [16] have been found. In contrast, alkaline-earth nitridophosphates of the composition MP 2 N 4 exhibit more similarities with oxo-and thiogallates, [17,18] oxogermanates, [19] and high-pressure oxoborates, [20] respectively (e.g. BaP 2 N 4 , [2] BaSr 2 P 6 N 12 , [3] and BaCa 2 P 6 N 12 [3] whose structures are derived from a high-pressure phase of CaB 2 O 4 [20] and BaGa 2 S 4 , [18] respectively).…”

“…Description of the structure: The framework structure of SrP 2 N 4 is isotypic with the TX 2 -framework structures (T = tetrahedral coordinated atom, Ga, Al, Si, Ge, Zn, P, Co; X = O) of BaGa 2 O 4 , [17] KAlGeO 4 , [19] KCoPO 4 , [46] and KZnPO 4 , [47] which correspond with the megakalsilite (KAlSiO 4 ) structure type [48] being a stuffed framework structure consisting of sequences of tetrahedral layers. Each layer perpendicular to [001] is built up from rings made of six corner-sharing PN 4 tetrahedrons (6-rings).…”

Synthesis and Crystal Structure of the New High‐Pressure Phase CdB2O4

“…Table 2 In SrP 2 N 4 , this superstructure is caused by avoiding one P À N À P angle of 1808 at nitrogen N15. The isotypic compounds BaGa 2 O 4 , [32] KAlSiO 4 , [33] KGeAlO 4 , [34,35] KCoPO 4 , [36] and CaP 2 N 4 [37] do not show the linear arrangement at the corresponding position. By contrast, the associated BÀOÀB angle in CdB 2 O 4 adopts a value of 1808 at oxygen O1 on thermal average ( Figure 6).…”

“…Related compounds: The structure of CdB 2 O 4 is closely related to the structure-type of the compounds BaGa 2 O 4 , [32] KAlSiO 4 , [33] KGeAlO 4 , [34,35] KCoPO 4 , [36] CaP 2 N 4 , [37] and SrP 2 N 4 . [38] Both structure types consist of layers of tetrahedra, forming "sechser" rings [39,40] with an identical orientation of the tetrahedra.…”

“…We report the synthesis and the crystal structure of this compound, including a comparative discussion concerning the related structures of BaGa 2 O 4 , [32] KAlSiO 4 , [33] KGeAlO 4 , [34,35] KCoPO 4 , [36] CaP 2 N 4 [37] and SrP 2 N 4 . [38] In contrast to CdB 2 O 4 , all these phases form a superstructure, whereas CdB 2 O 4 exhibits the basic structure of this family for the first time.…”