The spontaneous formation of nanodomains of the Sb-rich layered intergrowth SnmSb2nTe3n+m compounds in a SnTe matrix resulted in ultralow lattice thermal conductivity.

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We report on the various types of Peierls like two dimensional structural modulations and relative phase stability of 2H and 1T poly-types in MoS 2 -ReS 2 and WS 2 -ReS 2 alloy system. Theoretical calculation predicts a polytype phase transition cross over at ~50 at.% of Mo and W in ReS 2 in both monolayer and bulk form, respectively. Experimentally, two different types of structural modulations at 50% and a modulation corresponding to trimerization at 75% alloy composition is observed for MoS 2 -ReS 2 and only one type of modulation is observed at 50% WS 2 -ReS 2 alloy system. The 50% alloy system is found to be a suitable monolithic candidate for metal semiconductor transition with minute external perturbation.ReS 2 is known to be in 2D Peierls distorted 1T d structure and forms a chain like superstructure. Incorporation of Mo and W atoms in the ReS 2 lattice modifies the metal-metal hybridization between the cations and influences the structural modulation and electronic property of the system. The results offer yet another effective way to tune the electronic 2 structure and poly-type phases of this class of materials other than intercalation, strain, and vertical stacking arrangement. I.