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Title: Superior Reliability Via Two‐Step Sintering: Barium Titanate Ceramics

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.13940· OSTI ID:1400930
 [1];  [1];  [1];  [2];  [1];
  1. State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China
  2. Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania 19104‐6272
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Two‐step sintering ( TSS ) in a reducing atmosphere has been employed to obtain fine‐grain BaTiO 3 ceramics with a core‐shell microstructure, a more uniform grain‐size distribution, and superior reliability for multilayer ceramic capacitor applications. Compared to ceramics of the same composition conventionally sintered for about the same time, TSS ceramics feature a thinner shell thickness thus a stronger dopant localization, which leads to a lower concentration, higher internal resistance and more dopant‐ association. Improved reliability is manifest in a 50% higher breakdown strength at ambient temperature and a 400% longer endurance time to withstand DC stress at 185°C, in addition to a less field‐and‐temperature‐dependent capacitance. A scaling analysis of the redistribution and endurance dynamics identifies transmission across the shell‐grain‐boundary region as the critical element beneficially impacted by core‐shell structure and two‐step sintering.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DEFG02‐11ER46814
OSTI ID:
1400930
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 99 Journal Issue: 1; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

References (30)

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