Preparation of neodymium sulphides by the reaction of Nd2(So4)3 with carbon disulphide

Sulfurization of rare-earth oxides with CS2

“…In the sulfurization step, sulfurization behavior of rare-earth oxides at low temperature is needed for understanding the reaction scheme. In our previous study for the sulfurization of Nd 2 (SO 4 ) 3 with CS 2 [2,3], the sulfate changed to Nd 2 S 3 via Nd 2 O 2 SO 4 , Nd 2 O 2 S and NdS 2 . Namely, the rareearth sulfides could be formed from sulfate without forming the oxide.…”

Preparation of R2S3 (R: La, Pr, Nd, Sm) powders by sulfurization of oxide powders using CS2 gas

“…In recent research, synthesis of Nd 2 S 3 by the carbothermic reduction of anhydrous neodymium sulfate (Nd 2 (SO 4 ) 3 ) in mixture gas of S 2 and N 2 [6] and the sulfurization of neodymium sulfate using CS 2 gas [6] were studied with the aim to develop the new sulfide production processes [7]. Synthesis of R 2 S 3 by sulfurization of the evaporated decomposition products of nitrate (R(NO 3 ) 3 ·nH 2 O, (R: La, Ce, Nd, Sm, Gd, Dy, Ho, Er, Yb, and Lu)) using H 2 S gas in the presence of graphite was also studied with the aim to decrease a sulfurization temperature and prepare fine-grained products [8].…”

Thermal Decomposition of NH<SUB>4</SUB>SCN for Preparation of Ln<SUB>2</SUB>S<SUB>3</SUB> (Ln=La and Gd) by Sulfurization

“…Carbon disulfide (CS 2 ) and hydrogen sulfide (H 2 S) gases are commonly used as sulfurizing agents. 4,5,7,[10][11][12][13][14][15][16][17][18][19][20] Gases that evolve during the thermal decomposition of ammonium thiocyanate (NH 4 SCN) can also be used as sulfurizing agents. 21) However, sulfurization with NH 4 SCN has not been investigated thoroughly.…”