Work

Large entropy change derived from orbitally assisted three-centered two-electron σ bond formation in metallic Li0.33VS2

Year: 2018

Type: article

Abstract: We discuss herein the emergence of a large entropy change in metallic ${\mathrm{Li}}_{0.33}{\mathrm{VS}}_{2}$ derived from orbitally assisted loose $\ensuremath{\sigma}$ bond formation. Comprehensive structural studies based on synchrotron x-ray and neutron diffraction analyses clarify the fabrication of ribbon chains at 375 K, consisting of multiple three-centered two-electron $\ensuremath{\sigma}$ bonds based on the viewpoint of local chemical bonding. Although the metallic conductivity persists down to the lowest temperature measured, an exceptionally large entropy change as a metal, as much as $\mathrm{\ensuremath{\Delta}}S=6.6\phantom{\rule{0.28em}{0ex}}{\mathrm{J}\phantom{\rule{0.16em}{0ex}}\mathrm{mol}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$, appears at the transition. The emergence of a large entropy change in a metallic state may possibly lead to different functional materials, such as a heat-storage material with a rapid thermal response.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.98.081104