Abstract
In situ unpolarized and polarized Fourier transform infrared spectra of a natural orthopyroxene at varying temperatures were obtained using a heating stage attached on an Infrared microscope. The three main bands (3,595, 3,520 and 3,410 cm−1) at room temperature are ascribed to OH fundamental stretching bands. With increasing temperature from room temperature to 500 °C, the 3,595 cm−1 band shifts 20 cm−1 to lower frequency. The total integral absorbance decreases with increasing temperature. These changes are reversible. Excluding the influences of dehydration, proton migration, thermal expansion, and changes in OH dipole direction, the change of integral absorbance with temperature reflects the temperature dependence of absorption coefficient due to the anharmonicity of OH vibration. Based on the integral absorption coefficient at room temperature (14.84 ppm−1 cm−2) from Bell et al. (Am Mineral 80:463–474, 1995), the integral absorption coefficients at other temperatures are calculated. The variation of integral absorption coefficient between room temperature and 500 °C obtained in this study is about 18.5 % and may be greater at higher temperature according to the proposed linear relationship.
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Acknowledgments
The manuscript benefited from comments and suggestions from Istvάn Kovάcs and an anonymous reviewer, and comments from the editor Catherine McCammon. This work was supported by the National Science Foundation of China (No. 41102024), the Fundamental Research Funds for Central Universities (WK2080000029), and the research fund for doctoral program of higher education of China (RFDP).
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Yang, Y., Xia, Q.K., Feng, M. et al. OH in natural orthopyroxene: an in situ FTIR investigation at varying temperatures. Phys Chem Minerals 39, 413–418 (2012). https://doi.org/10.1007/s00269-012-0496-x
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DOI: https://doi.org/10.1007/s00269-012-0496-x