| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Raman and Mid-IR Spectral Analysis of the Atacamite-Structure Hydroxyl/Deuteroxyl Nickel Chlorides Ni2(OH/D)3Cl |
| LIU Xiao-Dong1,2**, Hagihala Masato1, ZHENG Xu-Guang1,3**, MENG Dong-Dong1,2, GUO Qi-Xin4
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1Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan
2Department of Physics, College of Science, Tianjin Polytechnic University, Tianjin 300160
3Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan
4Synchrotron Light Application Center & Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan
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| Cite this article: |
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LIU Xiao-Dong, Hagihala Masato, ZHENG Xu-Guang et al 2011 Chin. Phys. Lett. 28 087805 |
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Abstract Vibrational spectra (Raman 4000–95 cm−1 and mid-IR 4000–400 cm−1) of the atacamite-structure Ni2(OH)3Cl, including a rarely reported kind of asymmetric trimetric hydrogen bond, as a member of the geometrically frustrated material series and its deuteride Ni2(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 modes δ(NiOH/D) in the correlation peak region (900–600 cm−1) with the corresponding mode frequency ratios ωv(OD)/ωv(OH)≈73% and ωδ(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 NiO5Cl and NiO4Cl2 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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78.30.-j
75.70.-y
33.20.Ea
33.20.Fb
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Received: 22 January 2011
Published: 28 July 2011
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