Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature

doi:10.1088/1674-1056/20/7/077801

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.

Keywords: geometrical frustration hydroxyl cobalt chloride hydroxyl cobalt bromide trimeric hydrogen bond

Received: 25 November 2010
Revised: 16 March 2011
Accepted manuscript online:

PACS:	78.30.-j	(Infrared and Raman spectra)
	33.20.Ea	(Infrared spectra)
	61.66.Fn	(Inorganic compounds)

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Liu Xiao-Dong(刘晓东), Meng Dong-Dong(孟冬冬), Hagihala Masato(萩原雅人), Zheng Xu-Guang(郑旭光), and Guo Qi-Xin(郭其新) Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature 2011 Chin. Phys. B 20 077801

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Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature

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