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Torsional mode frequency and elastic anisotropy in alkali vermiculites

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Abstract

The torsional mode frequency ωt in Cs1−xRbx-Vermiculite has been determined using an angular force constant model and a virtual crystal approximation. The sensitivity of ωt has been examined with respect to the force constants between the Kagome' oxygen frame and the interlayer cations. These force constants were used to calculate the longitudinal elastic constants, C11 and C33 and are consistent with the observed elastic anisotropy in related layer silicates. The observed nonlinear x-dependence of the torsional mode frequency in ternary systems can be related to the polarizability of the interlayer cations (Cs+,Rb+).

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Author notes

  1. H. C. Gupta

    Present address: Physics Department, Indian Institute of Technology, New Delhi, India

Authors and Affiliations

  1. Center for Fundamental Materials Research and Department of Physics and Astronomy, Michigan State University, 48824, East Lansing, MI, USA

    H. C. Gupta, S. D. Mahanti & S. A. Solin

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  1. H. C. Gupta
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  2. S. D. Mahanti
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  3. S. A. Solin
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Gupta, H.C., Mahanti, S.D. & Solin, S.A. Torsional mode frequency and elastic anisotropy in alkali vermiculites. Phys Chem Minerals 16, 291–294 (1988). https://doi.org/10.1007/BF00220697

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  • DOI: https://doi.org/10.1007/BF00220697

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