Synthesis, Crystal Structure, Magnetism, and Optical Properties of Gd3[SiON3]O—An Oxonitridosilicate Oxide with Noncondensed SiON3 Tetrahedra

Ln3[SiON3]O (Ln = La, Ce, Pr) – Three Oxonitridosilicate Oxides with Crystal Structures Derived from the Anti‐Perovskite Structure Type

“…This effect was also observed for Gd 3 [SiON 3 ]O. [2] Furthermore, the displacement ellipsoid of O(2) is elongated, which is presumably due to the deformation of the OLn 6 octahedra (Ln = La, Ce, Pr), mentioned above. Therefore, a splitting of this site was assumed at lower temperatures analogously with the Gd containing compound.…”

“…[2] In Figure 2, the crystallographic relationship between the two structures is clarified using a group-subgroup scheme. Due to the hierarchical structural relation (SiON 3 units substitute for alkaline earth in the perovskite structure type) the complex SiON 3 tetrahedra have been approximated by the coordinates of their tetrahedral center (Si).…”

“…Oxonitridosilicates are intermediates between classical oxosilicates and nitridosilicates and can be formally derived by partial substitution of O for N. While oxygen in classical oxosilicates usually occur in a terminal O [1] or simply bridging O [2] function, nitrogen atoms can additionally act as a triply (N [3] ) or even quadruply (N [4] ) bridging atom, leading to a manifold of additional structural possibilities. Consequently, nitridosilicates exhibit a more variable degree of condensation in the range 1 : 4 ≤ κ ≤ 3 : 4 (i.e.…”

“…[1] In this context, the oxonitridosilicate oxide Gd 3 [SiON 3 ]O [2] has been investigated which is isotypic to Ba 3 [SiO 4 ]O [3,4] and Cs 3 [CoCl 4 ]Cl. [5] All three compounds can be derived from the anti-perovskite structure type in a hierarchical sense with tetrahedral building blocks (SiON 3 , SiO 4 , CoCl 4 ) substituting the large alkaline earth ions in perovskite.…”

Antiperovskite Nitridophosphate Oxide Ho3[PN4]O by High‐Pressure Metathesis

“…The diverse M 3 [TO 4 ]X structures have been described on the basis of the stacking arrangement of closely packed M 3 [TO 4 ] layers, in which the orientation of the tetrahedra and the occupation of the X site direct the stacking order , . The tetragonal structure type with space group I 4/ mcm of Ho 3 [PN 4 ]O has been realized in several tetrahedra‐based material classes, for example, sulfates (K 3 [SO 4 ]F), selenates (K 3 [SeO 4 ]F), aluminates (Sr 3 [AlO 4 ]F), silicates (Ba 3 [SiO 4 ]O),, and oxonitridosilicates (Gd 3 [SiN 3 O]O) . All M 3 [TO 4 ]X structures feature XM 6 octahedra; Gd 3 [SiN 3 O]O is electrostatically closest to the present Ho 3 [PN 4 ]O, and both contain [OLn 6 ] 16+ complex ions …”