Raman spectroscopy of titanomagnetites: Calibration of the intensity of Raman peaks as a sensitive indicator for their Ti content

Journal Article · Thu Oct 15 00:00:00 EDT 2015 · Am. Mineral.

DOI:https://doi.org/10.2138/am.2011.3745· OSTI ID:1038608

Zinin, Pavel; Tatsumi-Petrochilos, Lisa; Bonal, Lydie; Acosta, Tayro; Hammer, Julia; Gilder, Stuart; Fuller, Mike ^[1]

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1. Hawaii

A systematic study of the Raman spectra of the titanomagnetite solid-solution series (Fe{sub 3-x}Ti{sub x}O{sub 4}) for x = {approx}0.0, 0.2, 0.4, and 0.6 has been conducted. The samples showed combinations of five previously predicted Raman peaks at {approx}190, 310, 460, 540, and 670 cm{sup -1} that correspond to vibrational modes with T{sub 2g}(1), E{sub g}, T{sub 2g}(3), T{sub 2g}(2), and A{sub 1g}, respectively. The calibration of Raman spectra for titanomagnetite with known values of Ti concentrations reveals a strong dependence of relative intensity for the T{sub 2g}(2) and T{sub 2g}(3) modes on Ti concentration. The most prominent feature is the appearance and increase in the relative intensity of a T{sub 2g}(3) peak above x = {approx}0.2. On the other hand, the Raman peak for the T{sub 2g}(2) mode gradually diminishes as Ti increases and nearly disappears at x = {approx}0.6. Combining the two relative intensities potentially provides a sensitive indicator of Ti content. The technique was applied to study titanomagnetite in grains from Hana Volcanics and melatroctolite from Rhode Island.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: NSFOTHER
• OSTI ID: 1038608
• Journal Information: Am. Mineral., Vol. 96, Issue (10) ; 10, 2011; ISSN 0003-004X
• Country of Publication: United States
• Language: ENGLISH