Raman Band Redshifting of α-Cu2(OH)3Cl with Decreasing the Temperature

Xiao Dong Liu; Xing Liang Xu; Dong Dong Meng; Masayoshi Fujihala; Xu Guang Zheng; Zheng Wei Chen; Qi Xin Guo

doi:10.4028/www.scientific.net/AMR.430-432.391

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 430-432Raman Band Redshifting of α-Cu2(OH)3Cl with...

Raman Band Redshifting of α-Cu₂(OH)₃Cl with Decreasing the Temperature

Abstract:

Raman spectra of the magnetic geometric frustration material – the botallackite-structure α-Cu2(OH)3Cl polycrystalline sample were measured down to liquid N2 temperature. It is found that the hydroxyl stretching bands shift abnormally according to the lattice thermal expansion effect of normal materials, i.e., they redshift with decreasing the sample temperature (negative thermal expansion) using liquid N2 cooling while other bands blueshift. This abnormality was also confirmed by observing the band-shifting caused by local laser heating effect using different laser powers, and can be qualitatively explained by checking the local hydroxyl environment with a trimeric hydrogen bond.