title: A vibrational spectroscopic study of the borate mineral takedaite Ca3(BO3)2.
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.
authors: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
authors: Ray L
authors: RL
authors: Frost
authors: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors: Andrés
authors: A
authors: López
authors: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors: Yunfei
authors: Y
authors: Xi
authors: Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil.
authors: Leonardo M
authors: LM
authors: Graça
authors: Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil.
authors: Ricardo
authors: R
authors: Scholz
mesh_terms: D001881:Borates / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D001881:Borates; D008903:Minerals
keywords: Borate; Calcium; Infrared spectroscopy; Raman spectroscopy; Takedaite