Sodium molybdate-hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates

Javier Mena-Garcia, Arnaud Ndayishimiye, Zhongming Fan, Steven E. Perini, Wenjie Li, Bed Poudel, Shashank Priya, Brian Foley, John Gaskins, Clive A. Randall

Research output: Contribution to journalArticlepeer-review

Abstract

To fulfill the demands of more bandwidth in 5G and 6G communication technology, new dielectric substrates that can be co-fired into packages and devices that have low dielectric loss and improved thermal conductivity are desired. The motivation for this study is to design composites with low dielectric loss (tan δ) and high thermal conductivity (κ), while still limiting the electrical conductivity, for microwave applications involving high power and high frequency. This work describes the fabrication of high-density electroceramic composites with a model dielectric material for cold sintering, namely sodium molybdate (Na2Mo2O7), and fillers with higher thermal conductivity such as hexagonal boron nitride. The physical properties of the composites were characterized as a function of filler vol.%, temperature, and frequency. Understanding the variation in measured properties is achieved through analyzing the respective transport mechanisms.

Original languageEnglish (US)
Pages (from-to)5975-5985
Number of pages11
JournalJournal of the American Ceramic Society
Volume106
Issue number10
DOIs
StatePublished - Oct 2023

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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