Affiliation:
1. Brunel Centre of Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge UB8 3PH, UK
Abstract
The prototype misfit layer compound (SnS)1.17NbS2 consists alternatingly of a metallic triatomic NbS2 layer, in which Nb atoms are sandwiched by S atoms, and an insulating SnS double layer featuring a NaCl-type structure. Here we investigate the effect of lattice misfit on the stability and chemical bonding in the misfit layer compound using a first-principles density functional theory approach. The calculations show that for the (SnS)1+xNbS2 approximants, the most stable one has x = 0.167, close to the experimental observations. Charge analysis finds a moderate charge transfer from SnS to NbS2. Sn or S vacancies in the SnS part affect the electronic properties and interlayer interactions. The obtained information here helps in understanding the mechanism of formation and stability of misfit layer compounds and ferecrystals and further contributes to the design of novel multilayer compounds and emerging van der Waals heterostructures.
Reference57 articles.
1. Misfit layer compounds (MS)nTS2 (M = Sn, Pb, Bi, rare earth elements; T = Nb, Ta; n = 1.08–1.19), a new class of layer compounds;Wiegers;Solid State Commun.,1989
2. Misfit layer compounds;Meerschaut;Curr. Opin. Solid State Mater. Sci.,1996
3. Chalcogenid misfit layer compounds;Rouxel;J. Alloys Compd.,1995
4. Misfit layer compounds: Structures and physical properties;Wiegers;Prog. Solid State Chem.,1996
5. Misfit layered compounds: Unique, tunable heterostructured materials with untapped properties;Ng;APL Mater.,2022