Schichtanionen in den Kristallstrukturen der isotypen Verbindungen Sr₂[Ga₂S₅], Ba₂[In₂S₅] und Ba₂[In₂Se₅]

Abstract

Die Verbindungen Sr2[Ga2S5], Ba2[In2S5] und Ba2[In2Se5] wurden aus stöchiometrischen Gemischen der Elemente bei Temperaturen zwischen 1150°C und 1250°C dargestellt. Sie kristallisieren zueinander isotyp (Raumgruppe Pbca, Z = 8) mit den Gitterkonstanten Sr2Ga2S5 a = 1252,3(6) pm, b = 1203,4(6) pm, c = 1118,0(5) pm; Ba2In2S5 a = 1316,7(6) pm, b = 1272,3(6) pm, c = 1178,4(5) pm; Ba2In2Se5 a = 1365,7(6) pm, b = 1318,2(6) pm, c = 1222,5(5) pm. In der Anionenteilstruktur sind GaS4(InS4/InSe4)‐Tetraeder über drei gemeinsame Ecken zu unendlich ausgedehnten Netzen verknüpft, in denen Ringe aus vier und acht Tetraedern vorliegen. Die Kationen befinden sich zwischen den Schichten und erreichen die Koordinationszahl sieben.

Syntheses and characterization of two new selenides Ba5Al2Se8 and Ba5Ga2Se8

“…In the past years, many ternary chalcogenides in the A/M/Q system (A = alkaline-earth metal; M = Al, Ga, In; Q = S, Se, Te) have been discovered and studied, including the large family of the AM 2 Q 4 compounds [21][22][23][24][25], the A 2 M 2 Q 5 compounds [26], Ba 5 Ga 2 S 8 [27], Ba 4 Ga 2 S 7 [28], Ba 3 Ga 2 S 6 [28], and Mg 5 Al 2 Se 8 [29]. Extensive investigation has been carried out on the luminescent properties of these compounds doped with rare earth activators since 1970 and some were found to exhibit very attractive luminescent properties [30][31][32][33].…”

Synthesis and Characterization of Ba2Ag2Se2(Se2)

“…The Ba–Se distances are close to the corresponding distances observed in other known compounds where Ba atoms are in a similar coordination environment. Examples are Ba 2 SnSe 4 [3.197(5)–3.792(9) Å], Ba 2 In 2 Se 5 [3.211(1)–3.781(1) Å], Ba 2 ZnSe 3 [3.197(1)–3.423(1) Å], and Ba 0.5 CuZrSe 3 [3.165(1)–3.470(1) Å] …”

Ba2In2Q5 (Q = S, Se): Synthesis, Crystal Structures, Electronic Structures, and Optical Properties

“…For example, many active ions (such as Eu, Co 2+ , Ho 3+ , Er 3+ , Tm 3+ ) doped Ba M 2 Q 4 ( M = Al, Ga, In; Q = S, Se) crystals achieved by high‐temperature solid‐state method have shown good chemical‐physical and optical properties 11–17. However, only a few compounds have been found in another important II 2 ‐III 2 ‐VI 5 ‐type system, such as A 2 Ga 2 S 5 ( A = Sr, Ba) and Ba 2 In 2 Q 5 ( Q = S, Se) 18. Among them, Ba 2 In 2 Q 5 ( Q = S, Se) crystals were firstly found in 1990 and only their crystal structures were studied, but their results of structure refinement should be taken carefully because of the high R values (Ba 2 In 2 Se 5 , R 1 = 0.106) 18.…”

“…However, only a few compounds have been found in another important II 2 ‐III 2 ‐VI 5 ‐type system, such as A 2 Ga 2 S 5 ( A = Sr, Ba) and Ba 2 In 2 Q 5 ( Q = S, Se) 18. Among them, Ba 2 In 2 Q 5 ( Q = S, Se) crystals were firstly found in 1990 and only their crystal structures were studied, but their results of structure refinement should be taken carefully because of the high R values (Ba 2 In 2 Se 5 , R 1 = 0.106) 18. In addition, their other important physics properties are still not reported.…”