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Elasticity of single-crystal aragonite by Brillouin spectroscopy

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Abstract

The elastic constants of natural single-crystal aragonite (CaCO3) have been measured by Brillouin spectroscopy at ambient conditions. The elastic constants C11, C22, C33, C44, C55, C66, C12, C13 and C23 are 171.1±1.0, 110.1±0.9, 98.4±1.2, 39.3±0.6, 24.2±0.4, 40.2±0.6, 60.3±1.0, 27.8±1.6 and 41.9±2.0 GPa, respectively, for aragonite. The linear compressibilities of the a-, b- and c-axis for aragonite at ambient conditions were derived from our measured data to be 3.0±0.2, 4.2±0.2 and 7.3±0.6×10−3 GPa−1, respectively. The aggregate bulk and shear moduli for aragonite using the Voigt-Reuss-Hill (VRH) scheme are thus calculated to be 68.9±1.4 and 35.8±0.2 GPa, respectively. The value of bulk modulus is in remarkable contrast to the literature value of 46.9 GPa measured almost a century ago. Our new datum, however, is closer to that derived from recent atomistic simulation and static compression studies.

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Acknowledgements

We are indebted to C. L. Chen for providing us with the sample, to H. D. Chiang at Institute of Materials Science and Engineering, National Sun Yat-Sen University for conducting probe analysis of the sample, and to the Instrumentation Center, College of Science, National Taiwan University for determining crystal orientations for two of the platelets. This work was supported by the Research Grant from National Sciences Council, ROC.

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  1. Chien-chih Chen

    Present address: Department of Earth Sciences and Institute of Geophysics, National Central University, Chungli, Taiwan, 320, ROC

Authors and Affiliations

  1. Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, Taiwan, 115, ROC

    Lin-gun Liu, Chien-chih Chen, Chung-Cherng Lin & Yi-jong Yang

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  1. Lin-gun Liu
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Liu, Lg., Chen, Cc., Lin, CC. et al. Elasticity of single-crystal aragonite by Brillouin spectroscopy. Phys Chem Minerals 32, 97–102 (2005). https://doi.org/10.1007/s00269-005-0454-y

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