Structure and staging of intercalated Ag xTaS 2 and Ag xTiS 2

Abstract

The crystal structure of the intercalation compounds Ag xTaS 2 ( 0≤ x≤ 2 3 ) and Ag xTiS 2 (0≤x≤0.42) are reported. For both intercalated dichalcogenides only stages n=2 and 1 are observed and there is no evidence for higher staging. In stage 1 Ag 2 3 TaS 2 , the silver ions reside in tetrahedral sites and the 2H b−TaS 2 structure changes to that of MoS 2. For stage 2 Ag 1 3 TaS 2 , we observe a six layer unit cell with the silver ions again in tetrahedral sites. In stage 1 Ag 0.42TiS 2 and stage 2 Ag 0.2TiS 2, the silver ions are in octahedral sites and there is no change of the host lattice stacking. The samples were prepared both thermally and electrolytically and the same lattice parameters were obtained in both cases.