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Lamination of magnesium oxide spacers to barium strontium zirconium titanate ceramics

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Abstract

We propose an innovative idea to bond the dielectric barium strontium zirconium titanate (BSTZO) plates with magnesium oxide (MgO) as the spacers to achieve a hermetic module without any air gaps between the dielectric and the spacer. The gold metallization can be applied across the whole assembly to create an integrated electrode. The gold metallization also eliminates pressure contact by external copper plates assemblies, which are required to achieve good contacts between the copper plates and the metallized surfaces of the BSTZO. The MgO spacers are processed using a dry-pressing and pressureless-sintering method. The thermal expansion coefficient (CTE) of BSTZO and MgO spacer was measured. In addition to matching the CTE between BSTZO dielectric and the MgO spacer, it is also critical to develop a good bonding material with CTE matching to BSTZO and MgO spacer. The effect of CTE for various bonding compositions on the dielectric properties was thoroughly studied and reported. The mechanism explaining the high and low dielectric constants for the laminates is proposed and discussed based on the CTE results and their effect on microstructural development.

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Acknowledgements

The authors would like to thank Elias N. Pulliam for measuring the dielectrical properties of some laminates. We gratefully acknowledge the support of the US Department of Energy through the LANL LDRD program for this work. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE-AC52-06NA25396.

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Authors and Affiliations

  1. Materials Science Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Ching-Fong Chen, Thomas A. Wynn & Dennis R. Guidry

  2. Accelerator Operations and Technology, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Quinn R. Marksteiner & Matthew R. Reiten

Authors
  1. Ching-Fong Chen
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  2. Quinn R. Marksteiner
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  3. Matthew R. Reiten
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  4. Thomas A. Wynn
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  5. Dennis R. Guidry
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Correspondence to Ching-Fong Chen.

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Chen, CF., Marksteiner, Q.R., Reiten, M.R. et al. Lamination of magnesium oxide spacers to barium strontium zirconium titanate ceramics. J Mater Sci 49, 5218–5226 (2014). https://doi.org/10.1007/s10853-014-8238-8

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  • DOI: https://doi.org/10.1007/s10853-014-8238-8

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