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首页> 中文期刊> 《中国物理快报：英文版》 >Raman and Mid-IR Spectral Analysis of the Atacamite-Structure Hydroxyl/Deuteroxyl Nickel Chlorides Ni_(2)(OH/D)_(3)Cl

Raman and Mid-IR Spectral Analysis of the Atacamite-Structure Hydroxyl/Deuteroxyl Nickel Chlorides Ni_(2)(OH/D)_(3)Cl

         
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Vibrational spectra(Raman 4000–95 cm−1 and mid-IR 4000–400 cm−1)of the atacamite-structure Ni_(2)(OH)3Cl,including a rarely reported kind of asymmetric trimetric hydrogen bond,as a member of the geometrically frustrated material series and its deuteride Ni_(2)(OD)3Cl are,to the best of our knowledge,reported for the first time and analyzed at room temperature.Through a comparative study of four spectra according to their crystal structural parameters,we assign OH stretching modes v(OH)in a functional group region(3700–3400 cm−1)and their deformation modesδ(NiOH/D)in the correlation peak region(900–600 cm−1)with the corresponding mode frequency ratiosωv(OD)/ωv(OH)≈73%andωδ(NiOD)/ωδ(NiOH)≈75%,and further self−consistently suggest Ni-O and Ni-Cl related modes in the fingerprint region(500–200 cm^(−1) and 200–0 cm−1,respectively)by use of the unified six-ligand NiO_(5)Cl and NiO_(4)Cl_(2) frames.This report may contribute to the spectral analysis of other hydroxyl transition-metal halides and to the understanding of the fundamental physics of their exotic magnetic geometrical frustration property from the spectral changes around the corresponding low transition temperatures.

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