SrSi₆N₈—A Reduced Nitridosilicate with a SiSi Bond

First-principles thermodynamic calculations and experimental investigation of Sr–Si–N–O system—synthesis of Sr2Si5N8:Eu phosphor

“…19,21,22 Various synthetic routes were tried for the synthesis of M-Si-N system compounds. It was reported that nitride phases, such as SrSiN 2 , Sr 2 Si 5 N 8 , SrSi 6 N 8 , and SrSi 7 N 10 were synthesized through a high temperature reaction of stoichiometric amounts of metals with silicon diimide, 11,[23][24][25][26] or reaction of all nitride materials under a nitrogen atmosphere. 16,27 Recently, the carbothermal reduction and nitridation (CRN) method was used to produce the Sr 2 Si 5 N 8 :Eu 2+ phosphor using SrCO 3 , Eu 2 O 3 , and Si 3 N 4 as starting materials.…”

29Si NMR Chemical Shifts in Crystalline and Amorphous Silicon Nitrides

“…For calibration of chemical shifts we compute silicon nitride polymorphs as well as ternary M-Si-N structures with structural data taken from the Inorganic Crystal Structure Database [ 20 ]: α-Si 3 N 4 [ 21 ], β-Si 3 N 4 [ 22 ], γ-Si 3 N 4 [ 23 , 24 ], BaSi 6 N 8 [ 25 ], Li 2 SiN 2 [ 26 ], and SrSi 6 N 8 [ 27 ]. Keeping the reported experimental lattice parameters constant we first optimize atomic positions (forces lower than 5 meV/Å) and, thereafter, compute absolute 29 Si NMR chemical shifts.…”

The Reduced Nitridogermanates(III) Ca6[Ge2N6] and Sr6[Ge2N6] with Ge−Ge Bonds

“…[7] Exceptions from this rule include the (oxido)nitridosilicate Ce 16 (Si 15 O 6 N 32 )containing SiN 6 octahedra and particularly SrSi 6 N 8 and BaSi 6 N 8 ,which feature Si III À Si III bonds next to dominating vertex-sharing Si IV N 4 tetrahedra. [8][9][10] Nitridogermanates exhibit am uch richer structural chemistry than known for nitridosilicates or -stannates. Building blocks can include bent [Ge II N 2 ] 4À anions, [11][12][13] trigonal planar [Ge IV N 3 ] 5À units, [14] as well as [Ge IV N 4 ] 8À tetrahedra.…”