Synthesis of LnCuS<SUB>2</SUB> (Ln=Ce, Pr, Nd, Sm, Gd, and Tb) Powder by Polymerized Complex Method and CS<SUB>2</SUB> Gas Sulfurization

Abstract

Rare earth copper sulfides, LnCuS 2 (Ln ¼ Ce, Pr, Nd, Sm, Gd and Tb), powders were synthesized by the following procedure: (1) Ln-Cu complex oxide was synthesized using the polymerized complex method, and (2) LnCuO 2 was sulfurized by the CS 2 gas. CS 2 gas sulfurization combined with a polymerized complex method can reduce a reaction temperature and a duration time. TG-DTA and XRD results indicated that Ln 0 -Cu polymerized complex (Ln ¼ Pr, Nd, Sm and Gd) was decomposed into Ln

Density functional theory study of hypotheticalPbTiO3-based oxysulfides

“…We consider replacing O with S via gaseous reagents. While several experimenters have used H 2 S and CS 2 to convert oxides to sulfides, [48][49][50][51] Ishikawa et al have succeeded in replacing just the apical O of the TiO 6 octahedra with S to create ordered oxysulfides. 16 We calculate the standard Gibbs free energy of reaction, ∆G 0 , of creating PbTiO 3−x S x with x = 0.2 -3 in the energetically preferred configurations discussed above by comparing the sum of the G 0 of the products to that of the reactants for three different substitution scenarios:…”

Improvement of hydrogen evolution under visible light over Zn1−2x(CuGa)xGa2S4photocatalysts by synthesis utilizing a polymerizable complex method

“…Therefore, the development of visible-lightdriven photocatalysts and improvement of their performances are important subjects. 11 In recent decades, many materials in wide categories, such as oxides, [12][13][14][15][16][17][18] oxynitrides, [19][20][21][22] carbon nitrides [23][24][25] and suldes, [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] have been studied as visible-lightdriven photocatalysts capable of H 2 evolution.…”

“…[26][27][28][29][30] While the CB and VB of ZnS consist of Zn4s4p and S3p orbitals, respectively, incorporation of Ag(I) and/or Cu(I) increases the VB potential due to the hybridization of the S3p and Ag4d and/or Cu3d orbitals. [26][27][28][29][30][31][32][33][34][35][36] These photocatalysts exhibit high activity for H 2 evolution from an aqueous solution containing suitable electron donors such as S 2À and SO 3 2À . The effects of Ag(I) and Cu(I) on narrowing the band gaps have also been shown in other materials, such as (Cu,Ag) 2 Zn(Ge,Sn)S 4 , CuGa 2 In 3 S 8 , AgGa 2 In 3 S 8 , CuGa 3 S 5 and Zn 1À2x (CuGa) x Ga 2 S 4 .…”

Synthesis of Silicon Sulfide by Using CS2 Gas

“…Many researchers [12][13][14][15][16][17][18][19][20][21][22][23] have investigated the reaction of metal oxides with CS 2 to form metal sulfides via the following reaction:…”

“…[6] This method has been suggested for use in nuclear fuel processing, laser applications, and thermoelectric devices. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Furthermore, CS 2 is more reducing than H 2 S and has been demonstrated as a means of refining the oxides and nitrides of Ti, V, and Sc. [26][27][28][29][30] Many investigators [12-23, 26, 30-34] have used a CS 2 bubbler to produce CS 2 gas for subsequent reactions and to limit the gas circuit for safety.…”