High-temperature synthesis and single-crystal X-ray structure determination of Sr10Sm6Si30Al6O7N54 — a layered sialon with an ordered distribution of Si, Al, O, and N

Sr5Al5+xSi21−xN35−xO2+x:Eu2+ (x≈0)—A Novel Green Phosphor for White‐Light pcLEDs with Disordered Intergrowth Structure

“…The structure and chemical composition has been confirmed by O 3 + x N 4Àx [25] (isotypic to Y 2 Si 3 O 3 N 4 ), [26][27][28][29] and Sr 2 Al x Si 12Àx N 16Àx O 2 + x (x % 2) [30] (isotypic to BaSi 6 N 8 O). [31] Whereas [32,33] The Si and Al atoms in these compounds are often disordered, but ordered anionic substructures have also been observed. The same holds for O/N ordering, except for N [3] and N [4] positions, which are always characteristic of N atoms, as O atoms bridging three or four tetrahedral Si centers have not been observed yet.…”

“…Some Sr À A C H T U N G T R E N N U N G (N,O) distances are a bit shorter than the smallest sum of the ionic radii (2.72 ), but similar to comparable distances in Sr 2 Si 5 N 8 (2.54-3.23 ), [52] SrSiAl 2 O 3 N 2 (2.50-3.18 ), [49] and Sr 10 Sm 6 Si 30 Al 6 O 7 N 54 (2.45-3.33 ). [32] Ten Sr 2 + ions per unit cell mediate the interconnection of ten sechser rings and 32 dreier rings.…”

(Sr1–xCax)(11+16y–25z)/2(Si1–yAly)16(N1–zOz)25 (x ≈ 0.24, y ≈ 0.18, z ≈ 0.19) – A Novel Sialon with a Highly Condensed Silicate Framework

“…Sr 10 Sm 6 Si 30 -Al 6 O 7 N 54 ). [31] The same is true concerning the O/N ordering. Compared to the oxosilicates, the formal replacement of O by N, yields more or less condensed network structures made up of Si(O,N) 4 tetrahedra and gives rise to manifold structural possibilities of (oxo)nitrido(alumino)silicates.…”

“…[30] Whereas other sialons are isostructural to oxosilicates, as AlN can replace SiO without changing the charge balance, several representatives of this class of compounds exhibit unique structure types (e.g. Sr 10 [31,32] The Si and Al atoms in these compounds are frequently disordered [e.g., MLn(Si 4-x Al x O x N 7-x ) (M = Eu, Sr, Ba; Ln = Ho-Yb)], [33] however, ordered anionic structures have been observed as well (e.g. Sr 10 Sm 6 Si 30 -Al 6 O 7 N 54 ).…”

Y23Sr17[Si38O18N67]O9 – An Oxonitridosilicate Oxide with a Unique Layered Structure

“…Further layered compounds include M Si 2 O 2 N 2 ( AE = Ca – Ba), M 3 Si 6 O 9 N 4 ( M = Ba, Eu), Ba 3 Si 6 O 12 N 2 , BaSi 4 O 6 N 2 , and Y 2 Si 3 O 3 N 4 . In the system RE/AE /Si/O/N, which was investigated in this contribution, Sr 10 Sm 6 Si 30 Al 6 O 7 N 54 and RE 26 Ba 6 [Si 22 O 19 N 36 ] ( RE = Y, Tb) are the only two compounds with layered structures so far , …”