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Dielectric constants of BeO, MgO, and CaO using the two-terminal method

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Abstract

Using fused SiO2, CaF2, and SrF2 samples with accurately known dielectric constants, we have evaluated the accuracy and precision of two-terminal dielectric constant measurements on small single crystals using empirically determined edge corrections. Values of κ′ at 1 MHz of 3.836±0.05 for silica, 6.814±0.07 for CaF2 and 6.463±0.09 for SrF2 indicate an accuracy and precision of 1.0–1.5% for samples having areas of 0.05–1.0 cm2. Dielectric constants of BeO, MgO, and CaO measured by this technique are: BeO, κ′a=6.87 and κ′c=7.74; MgO, κ′= 9.90; and CaO, κ′=11.95 where κ′a and κ′c are the dielectric constants parallel to the a and c axes, respectively. Dielectric loss measurements on CaO in vacuum between 5–400 K at 10–105 Hz indicate significant dispersion at temperatures higher than 300 K, but the effect of the losses on the dielectric constant is less than 1% at 1 MHz and 300 K.

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Authors and Affiliations

  1. Central Research and Development Department, E.I. du Pont de Nemours & Co., Inc., Experimental Station, Contribution No. 4997, 19880-0356, Wilmington, DE, USA

    M. A. Subramanian, R. D. Shannon & M. M. Abraham

  2. Allied Corporation, Corporate Headquarters, 07960, Morristown, NJ, USA

    B. H. T. Chai

  3. United States Naval Academy, 21402, Annapolis, MD, USA

    M. C. Wintersgill

Authors
  1. M. A. Subramanian
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  2. R. D. Shannon
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  3. B. H. T. Chai
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  4. M. M. Abraham
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  5. M. C. Wintersgill
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Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37831, USA

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Subramanian, M.A., Shannon, R.D., Chai, B.H.T. et al. Dielectric constants of BeO, MgO, and CaO using the two-terminal method. Phys Chem Minerals 16, 741–746 (1989). https://doi.org/10.1007/BF00209695

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