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

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

中国物理B ›› 2011, Vol. 20 ›› Issue (7): 77801-077801.doi: 10.1088/1674-1056/20/7/077801

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

刘晓东¹, 孟冬冬¹, 萩原雅人¹, 郑旭光¹, 郭其新²

(1)Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan; (2)Synchrotron Light Application Center & Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan

收稿日期:2010-11-25 修回日期:2011-03-16 出版日期:2011-07-15 发布日期:2011-07-15

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

Liu Xiao-Dong(刘晓东)^a)^†, Meng Dong-Dong(孟冬冬)^a), Hagihala Masato(萩原雅人)^a), Zheng Xu-Guang(郑旭光)^a)b), and Guo Qi-Xin(郭其新)^c)

^a Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan; ^b Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan; ^c Synchrotron Light Application Center & Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan

Received:2010-11-25 Revised:2011-03-16 Online:2011-07-15 Published:2011-07-15

摘要/Abstract

摘要： 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.

关键词: geometrical frustration, hydroxyl cobalt chloride, hydroxyl cobalt bromide, trimeric hydrogen bond

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.

Key words: geometrical frustration, hydroxyl cobalt chloride, hydroxyl cobalt bromide, trimeric hydrogen bond

中图分类号: (Infrared and Raman spectra)

78.30.-j

33.20.Ea (Infrared spectra) 61.66.Fn (Inorganic compounds)

刘晓东, 孟冬冬, 萩原雅人, 郑旭光, 郭其新. Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature[J]. 中国物理B, 2011, 20(7): 77801-077801.

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[J]. Chin. Phys. B, 2011, 20(7): 77801-077801.

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

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

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