Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature |
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| Authors: | Liu Xiao-Dong Meng Dong-Dong Hagihala Masato Zheng Xu-Guang and Guo Qi-Xin |
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| Affiliation: | Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan; Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan; Synchrotron Light Application Center & Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan |
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| Abstract: | Mid-infrared absorption and Raman spectra of the geometrically frustrated material series, hydroxyl cobalt halides β -Co2(OH)3Cl and β -Co2(OH)3Br, are first, to the best of our knowledge, measured at room temperature, to study the corresponding relationship between their vibrational spectral properties and crystal microstructures. Through the comparative analysis of the four spectra we have categorically assigned the OH-related vibration modes of hydroxyl groups in the trimeric hydrogen bond environment (Co3 ≡ OH)3 ··· Cl/Br, and tentatively suggested vibration modes of O—Co—O, Co—O and Cl/Br—Co—Cl/Br units. These results can also become the basis for analysing their low-temperature spectral properties, which can help to understand the underlying physics of their exotic geometric frustration phenomena around phase transition temperatures. |
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| Keywords: | geometrical frustration hydroxyl cobalt chloride hydroxyl cobalt bromide trimeric hydrogen bond |
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