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Infrared reflectance of single-crystal jarandolite, CaB₃O₄(OH)₃

P. M. Nikoli^1,*, S. Ðuri¹, K. M. Paraskevopoulos², T. T. Zorba², D. Lukovi¹, S. Savi¹, V. Blagojevi³ and M. V. Nikoli⁴

¹ Institute of Technical Science of SASA, Knez Mihailova 35/IV, P.Box 315, 11000 Belgrade, Serbia
² Physics Department, Solid State Section, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
³ Faculty of Electronic Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
⁴ Centre for Multidisciplinary Studies of the University of Belgrade, Kneza Viseslava 1, 11000 Belgrade, Serbia

^* E-mail: nikolic{at}sanu.ac.yu

Polarized far- and mid-infrared reflectance spectra were measured at room temperature for the new mineral species jarandolite, CaB₃O₄(OH)₃, for the two principal directions. Thirty three vibration modes for || and 32 for were observed and analysed numerically. Symmetry analysis predicts 41 || and 40 vibration modes that include lattice and O–H modes. Mode assignment was made based on the structure of jarandolite. The values of the mode frequencies (_TO), the damping factors () and the oscillator strength (S) of each oscillator were obtained by fitting to a Lorentz model.

KEYWORDS: jarandolite, IR reflectance spectra, Lorentz model