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American Mineralogist; February-March; v. 93; no. 2-3; p. 470-476; DOI: 10.2138/am.2008.2687
© 2008 Mineralogical Society of America
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In situ Raman spectroscopy measurements of MgAl2O4 spinel up to 1400 °C

Sarah P. Slotznick and Sang-Heon Shim*

Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Massachusetts 02139, U.S.A.

Correspondence: * E-mail: sangshim{at}mit.edu

In-situ Raman measurements using a gated spectroscopy system revealed irreversible changes at 800–1000 °C in a natural red spinel (with 2 cation mol% Cr and 1 cation mol% Zn) and at 1100–1200 °C in a natural clear spinel (without Cr or Zn). Our observations of rapid broadening of a mode at 409 cm–1 and the appearance of two weak modes at 210 and 520 cm–1 at the transition temperature confirm the association of these features with cation disordering proposed by previous quench studies. Furthermore, we found that the frequencies of modes at 313 and 666 cm–1 change at the transition temperature. The discontinuous frequency decrease of the mode at 313 cm–1 and the increase in the frequency of the mode at 666 cm–1 can be explained by the entrance of heavier Al atoms into the tetrahedral sites and the entrance of lighter Mg atoms into the octahedral sites, respectively. Our study demonstrates that in-situ Raman spectroscopy is a powerful tool for studying cation disordering in spinel-structured minerals at high temperature.

Key Words: Spinel • Raman spectroscopy • order-disorder transition • high temperature




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R. Zucker and S.-H. Shim
In situ Raman spectroscopy of MgSiO3 enstatite up to 1550 K
American Mineralogist, November 1, 2009; 94(11-12): 1638 - 1646.
[Abstract] [Full Text] [PDF]


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