A vibrational spectroscopic study of the borate mineral takedaite Ca3(BO3)2
Ray L Frost1, Andrés López1, Yunfei Xi1
1School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Abstract:
We have studied the mineral takedaite Ca3(BO3)2, a borate mineral of calcium using SEM with EDX and vibrational spectroscopy. Chemical analysis shows a homogeneous phase, composed of Ca. Boron was not detected. A very intense Raman band at 1087 cm(-1) is assigned to the BO stretching vibration of BO3 units. Additional Raman bands may be due to isotopic splitting. In the infrared spectrum, bands at 1218 cm(-1) and at 1163, 1262 and 1295 cm(-1) are assigned to the trigonal borate stretching modes. Raman bands at 712 and 715 cm(-1) are assigned to the in-plane bending modes of the BO3 units. Vibrational spectroscopy enables aspects of the molecular structure of takedaite to be assessed.
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