Synthesis, Structure, and Electronic Structure of the Ternary Sulfide La₇Sb₉S₂₄

Abstract

A ternary sulfide exists on the quasi-binary section La 2 S 3 -Sb 2 S 3 , La 7+δ Sb 9-δ S 24 . This material exhibits a small but significant phase range with at least -0.296(4) e δ e 0.134(6). La 7+δ Sb 9-δ S 24 forms a new structure type, space group P2 1 /c, with a ) 8.7115(9) Å, b ) 14.3450(15) Å, c ) 15.2657(16) Å, β ) 90.105(2)°(Z ) 2) for δ ) 0.13. This structure contains chains of severely distorted SbS 5 square antiprisms, interconnected by eight-and nine-coordination La atoms. One position is mixed-occupied by La and Sb, with the La content ranging at least from 57% to 35%. La 7 Sb 9 S 24 is a blackish material with a computed gap >1.5 eV.

Syntheses, crystal structures, and NLO properties of the quaternary sulfides RE3Sb0.33SiS7 (RE=La, Pr)

“…The SbS 6 octahedra is slightly distorted with Sb-S bond lengths between 2.73 and 2.74 Å, which is comparable to those found in related compounds, for instance, RE 4 GaSbS 9 [23a] (2.45-2.84 Å), La 4 FeSb 2 S 10 (2.46-2.92 Å), RE 2 Mn 3 Sb 4 S 12 [22] (2.45-2.93 Å), and La 7 Sb 9 S 24 [42] (2.43-3.00 Å).…”

“…All these La-S distances are close to the normal range as in the related lanthanide sulfides: La 3 Mg 0.5 SiS 7 (2.88-3.11 Å) [38], La 7 Sb 9 S 24 [42] (2.79-3.54 Å), and La 4 FeSb 2 S 10 (2.90-3.34 Å) [22a].…”

Synthesis, Crystal Structure, and NLO Property of the Chiral Sulfide Sm4InSbS9

“…However, there are still weak Sb–S interactions (2.93 Å); inclusion of these long bonds makes the local coordination of the Sb atom an incomplete octahedron (with two vacant equatorial sites). The bond lengths are comparable with those found in La 4 InSbS 9 (2.44–2.91 Å),10 Sm 4 GaSbS 9 (2.45–2.84 Å),9a La 4 FeSb 2 S 10 (2.46–2.92 Å),8 and La 7 Sb 9 S 24 (2.43–3.00 Å) 13…”

Synthesis, Crystal Structure, and Optical Property of the Quaternary Semiconductor La4Cd4In2S13

“…The four unique La atoms exhibit approximate bicapped trigonal prismatic (BTP) environments with La-S contacts in the range of 2.94 to 3.28 Å. All these La-S distances are close to the normal range as in the related lanthanide sulfides: La 3 Mg 0.5 SiS 7 (2.88-3.11 Å), [19] La 3 FeGaS 7 (2.86-3.46 Å), [20] La 7 Sb 9 S 24 (2.79-3.54 Å), [21] La 4 FeSb 2 S 10 (2.90-3.34 Å), [22] and La 4 InSbS 9 (2.84-3.45 Å). [8] …”