Abstract
The in situ Raman spectra of a hydrous anorthoclase at temperatures of 20–800 °C have been measured using a LABRAM-HR spectrometer and Linkam TS 1500 heating stage. The frequencies of modes at 54, 99, 130 and 162 cm−1 related to M–O vibrations decrease sharply and then increase drastically or keep steady at temperatures above 200 °C. A knee point can be clearly seen at about 200 °C for those modes. The frequency of the mode at 282 cm−1 shows little temperature dependence. However, for the two strongest modes at 471 and 512 cm−1, the frequencies decrease linearly with increasing temperature. From evolution of the frequencies of modes at 54, 99, 130 and 162 cm−1 with temperature, the following conclusions can be drawn: (1) The distance of the local M–O bond shortens rather than lengthens at temperatures above 200 °C; (2) The abrupt changes of the local structure of M site induce a collapse of the framework structure and displacive phase transition at 200 °C; and (3) The H atoms incorporated in anorthoclase are located at the M site. These results are indicative for the structure and properties of anorthoclase at deep earth conditions.
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Acknowledgments
This work was supported by the National Science Foundation of China (Nos. 41102024 and 41225005). The authors thank Dr. Joseph R. Smyth (Professor in the Department of Geological Sciences, University of Colorado Boulder) for the language editing. Constructive comments from the two anonymous reviewers are greatly appreciated.
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Yang, Y., Wang, Z.P., Tian, Z.Z. et al. High-temperature phase transition and local structure of a hydrous anorthoclase. Phys Chem Minerals 43, 111–118 (2016). https://doi.org/10.1007/s00269-015-0778-1
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DOI: https://doi.org/10.1007/s00269-015-0778-1