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Effect of H_2O and CO_2 on Dielectric Properties of Single-Crystal Cordierite and Comparison with Polycrystalline Cordierite

Shannon, Robert D. and Mariano, Anthony N. and Rossman, George R. (1992) Effect of H_2O and CO_2 on Dielectric Properties of Single-Crystal Cordierite and Comparison with Polycrystalline Cordierite. Journal of the American Ceramic Society, 75 (9). pp. 2395-2399. ISSN 0002-7820. doi:10.1111/j.1151-2916.1992.tb05591.x. https://resolver.caltech.edu/CaltechAUTHORS:20140414-152310618

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Abstract

The dielectric constants and dielectric loss values of two naturally occurring cordierite single crystals were determined at 1 MHz using a two-terminal method and empirically determined edge corrections. The results are as follows. Cordierite 1: κ^′_a= 5.653, tan δ= 0.009; κ^′_b= 6.106, tan δ= 0.003; κ^′_c= 5.658, tan δ= 0.010. Cordierite 2: κ^′_a= 5.765, tan δ= 0.0006; κ^′_b= 6.334, tan δ= 0.0007; κ^′_c= 5.807, tan δ= 0.0007. The agreement between measured dielectric polarizabilities as determined from the Clausius–Mosotti equation and those calculated from the sum of oxide polarizabilities according to α_D (mineral) =Σα_D (oxides) neglecting the channel H_2O and CO_2 for these two cordierite samples is ∼20%. Inclusion of the effects of water and CO_2 assuming mobile H_2O molecules with no correlation between their dipoles improves the agreement to ∼2%. Comparison of dielectric constants of manufactured cordierite ceramics shows a discrepancy between typical observed values of 4.5–5.0 and a theoretical value of 4.0 calculated from the Clausius–Mosotti equation. In certain cases, this discrepancy can be accounted for by the presence of high-κ^′ impurities, but in others there is no explanation for the differences.


Item Type:Article
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http://onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1992.tb05591.x/abstractPublisherArticle
http://dx.doi.org/10.1111/j.1151-2916.1992.tb05591.xDOIArticle
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 1992 John Wiley & Sons, Inc. Article first published online: 8 Mar 2005. Manuscript No. 196341. Received October 24, 1991; approved April 9, 1992. Manuscript No. 196341. D. J. Shanefield–contributing editor. Supported in part by National Science Foundation Grant No. EAR-86-16064. We thank L. W. Harrison for the TGA experiments, R. W. Shiffer for sample preparation, S. L. Bors and E. A. Tomic for preparation of the polycrystalline cordierite, R. A. Oswald for making the capacitance measurements, A. Brown (Studsvik Energiteknik AB, Nykoping, Sweden) and C. Foris for obtaining cell dimensions, D. R. Bell and J.T. Armstrong (California Institute of Technology, Pasadena, CA) for microprobe data.
Funders:
Funding AgencyGrant Number
NSFEAR-86-16064
Issue or Number:9
DOI:10.1111/j.1151-2916.1992.tb05591.x
Record Number:CaltechAUTHORS:20140414-152310618
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140414-152310618
Official Citation:Shannon, R. D., Mariano, A. N. and Rossman, G. R. (1992), Effect of H2O and CO2 on Dielectric Properties of Single-Crystal Cordierite and Comparison with Polycrystalline Cordierite. Journal of the American Ceramic Society, 75: 2395–2399. doi: 10.1111/j.1151-2916.1992.tb05591.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44937
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Apr 2014 22:44
Last Modified:10 Nov 2021 16:58

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