Synthesis and characterization of a new quaternary selenide Sr3GeSb2Se8

Germanium Antimony Bonding in Ba4Ge2Sb2Te10 with Low Thermal Conductivity

“…With the aim of discovering new chalcogenides containing both Ge/Sn and Sb/Bi in one structure, we have explored the Ak–Ge/Sn–Sb/Bi–Q (Ak = alkaline-earth metal and Q = Se and Te) quaternary system. A literature survey of the Ak–Tt–Pn–Q (Ak = Ba and Sr; Tt = Si, Ge, and Sn; Pn = As, Sb, and Bi; and Q = S, Se, and Te) phase diagram using the ICSD database showed only a few compounds: Ba 3 Sn 0.87 Bi 2.13 Se 8 , Ba 3 Bi 6 SnSe 13 , Ba 3 SnSb 2 Se 8 , Sr 3 Sn 0.96 Bi 2.04 Se 8 , Sr 8.01 Ge 2.04 Bi 7.95 Se 24 , Ba 2 Sb 4 GeS 10 , Sr 3 Ge 0.95 Sb 2.06 Se 8 , and Ba 4 SiSb 2 Se 11 . Surprisingly, there is no report of any telluride in this family.…”

Ba14Si4Sb8Te32(Te3): hypervalent Te in a new structure type with low thermal conductivity

“…A literature survey of the Ak – Tt – Pn – Q phase diagram, where Ak represents heavier alkaline-earth metals (Sr and Ba), Tt = Si, Ge, and Sn, and heavier Pnictogens ( Pn = Sb and Bi), using the ICSD database 33 showed the presence of the following compounds: Ba 4 SiSb 4 Se 11 , 34 Ba 2 Sb 4 GeS 10 , 35 Ba 4 GeSb 2 Se 11 , 36 Ba 3 SnSb 2 Se 8 , 37 Ba 3 Sn 0.87 Bi 2.13 Se 8 , 37 Sr 3 Sn 0.96 Bi 2.04 Se 8 , 37 Ba 3 Bi 6 SnSe 13 , 38 Sr 8.01 Ge 2.04 Bi 7.95 Se 24 , 37 and Sr 3 Ge 0.95 Sb 2.06 Se 8 . 39 In general, the Ak – Tt – Pn – Q quaternaries with complex low symmetry structures should show low thermal conductivity values due to the high atomic number of the constituents, a relatively large number of atoms in their unit cell, the SAEP of Pn atoms especially for Sb/Bi, and their complex bonding characteristics. 40 Recently, during our exploration of the Ak – Tt – Pn – Q phase diagram, we synthesized two new compounds: Ba 4 Ge 2 Sb 2 Te 10 41 and Ba 3.14 Sn 0.61 Bi 2.39 S 8 .…”