ATTENUATED TOTAL-REFLECTION INFRARED MICROSPECTROSCOPY OF PARTIALLY DISORDERED ZIRCON

作者：Titorenkova Rositsa^*; Gasharova Biliana; Mihailova Boriana; Konstantinov Ludmil

来源：The Canadian Mineralogist, 2010, 48(6): 1409-1421.

DOI：10.3749/canmin.48.5.1409

• zircon
• structural disorder
• synchrotron ATR-IR microspectroscopy
• Raman scattering

Polarized synchrotron-based attenuated total-reflection infrared (ATR-IR) spectra of crystals of natural zircon of various origins and degree of disorder are reported. We demonstrate the potential of ATR-IR microspectroscopy for non-destructive structural analysis of zircon microcrystals. Disorder-related IR absorption at wavenumbers lower than the bands arising from the fundamental A(2u)[v(3)(SiO4)] and Eu[v(3)(SiO4)] zircon modes was observed, which reveals the existence of spatial regions with abundant SiO4 tetrahedra with longer bonds. A pronounced peak near 990 cm(-1) is indicative of an abundance of polymerized SiO4 tetrahedra. Weak signals in the range 1050-1250 cm(-1) show connectivity defects (broken Si-O-Zr bridges) and the existence of shorter Si-O bonds.

• 出版日期2010-12