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Dielectric constants of topaz, orthoclase and scapolite and the oxide additivity rule

Physics and Chemistry of Minerals volume 19, pages 166–170 (1992)Cite this article

Abstract

The dielectric constants and dissipation factors of topaz, scapolite and orthoclase were determined at 1 MHz using a two-terminal method and empirically determined edge corrections. The results are: topaz κ′ a =6.61 tan δ=0.0005 κ′ b =6.82 tan δ=0.0007 κ′ c =6.81 tan δ=0.0007 orthoclase κ′ a =4.69 tan δ=0.0007 κ′ b =5.79 tan δ=0.0007 κ′ c =5.63 tan δ=0.0011 κ′ 11 =4.72 κ′ 22 =5.79 κ′ 33 =5.76 scapolite κ′ a =6.74 tan δ=0.0004 κ′ c =8.51 tan δ=0.0004 The deviation (Δ) between measured dielectric polarizabilities as determined from the Clausius-Mosotti equation and those calculated from the sum of ion polarizabilities according to α D (mineral)=∑αD (ions) for topaz is 2.5%. The large deviations of orthoclase and scapolite from the oxide additivity rule with δ=+7.2 and + 17.6%, respectively, are attributed to “rattling” K ions in orthoclase and “rattling” (Na,K,Ca) ions and disordered O= and Cl- ions in scapolite.

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Authors and Affiliations

  1. Central Research and Development, Experimental Station 356/329, E.I. Du Pont de Nemours, 19880-0356, Wilmington, DE, USA

    Robert D. Shannon & Robert A. Oswald

  2. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA

    George R. Rossman

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  1. Robert D. Shannon
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  2. Robert A. Oswald
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  3. George R. Rossman
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Shannon, R.D., Oswald, R.A. & Rossman, G.R. Dielectric constants of topaz, orthoclase and scapolite and the oxide additivity rule. Phys Chem Minerals 19, 166–170 (1992). https://doi.org/10.1007/BF00202104

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  • DOI: https://doi.org/10.1007/BF00202104

Keywords

  • Oxide
  • Dielectric Constant
  • Mineral Resource
  • Material Processing
  • Oxide Additivity