Über Oxidsulfide mit Åkermanitstruktur CaLaGa₃S₆O, SrLaGa₃S₆O, La₂ZnGa₂S₆O und Sr₂ZnGe₂S₆O

Abstract

Die Oxidsulfide A — CaLaGa3S6O a = 9,2706(8), c = 6,0351(9) Å; B — SrLaGa3S6O a = 9,347(10), c = 6,0893(10) Å; C — La2ZnGa2S6O a = 9,3653(15), c = 6,0928(10) Å und D — Sr2ZnGe2S6O a = 9,4054(7), c = 6,1718(7) Å wurden erstmals präpariert. Für A und C wurden die Lageparameter mit Einkristalldaten verfeinert. Raumgruppe D 2d3—P421m, Nr. 113. Probleme der Punktlagenbesetzung werden über Abstandsvergleiche diskutiert. Die neuen Stoffe werden bezüglich der c/a‐Verhältnisse mit Literaturdaten isotyper Verbindungen verglichen.

Luminescent properties of Eu2+-activated SrLaGa3S6O phosphor

“…The crystal structure of SrLaGa 3 S 6 O is shown in Fig. 1 [1]. The typical powder X-ray diffraction patterns of (Sr 1−x Eu x )LaGa 3 S 6 O with x = 0.0-1.0 are shown in Fig.…”

“…The crystal structure of SrLaGa 3 S 6 O has recently been refined to be tetragonal, space group P42 1 m with a = 9.374Å and c = 6.0893Å [1]. The frames of the compounds are formed by five-membered rings constructed from [Ga(O/S) 4 ] 5− tetrahedral linked at each corner.…”

“…In recent years, many investigations of the preparation and the crystal chemistry of melilite families have been performed [1][2][3][4][5][6][7][8][9][10]. At the same time, their properties have been widely studied.…”

La3TWS3O6 (T = Cr, Mn, Fe, Co, Ni): Quinary Rare Earth Transition‐Metal Compounds Showing a Nonmagnetic/Magnetic Transition (T = Co) – Synthesis, Structure and Physical Properties

“…A conventional electron partition of (La 3+ ) 3 T 3+ W 6+ (S 2-) 3 (O 2-) 6 shows that the structure matrix acts as a [La 3 WS 3 O 6 ] 3anion, forcing the transition metal to have a 3 + charge state. Whereas the 3 + state is common for chromium, iron, and cobalt, it is of fewer occurrence for manganese and particularly nickel in aqueous solutions [16].…”

“…The synthesis of quinary solid compounds has been a challenge for chemists partly because the reaction thermodynamics normally favors their simpler binary, ternary and quaternary constituents. Only a few lanthanide oxysulfides have been reported [1][2][3][4][5][6][7][8]. Among them are LaCaGa 3 S 6 O [6], LiLa 2 F 3 (SO 4 ) 2 [8], La 5 Ti 6 S 3 Cl 3 O 15 [5], La 5 Ti 2 MS 5 O 7 (M = Cu, Ag) [2] and La 2 LnMS 2 O 5 (Ln = La, Y; M = Nb, Ta) [1] (many of these compounds can also be called oxide sulfide according to IUPAC 2005 Recommendation IR-2.15.2 as there are no O-S bonds in them).…”