Structure and dielectric properties of yttrium-doped Ca0.28Ba0.72Nb2O6 ceramics.

Harry Peirson, Juncheng Pan, Yizhe Li, David A. Hall, Andy P. Brown, Rik M. Drummond-Brydson, Steven J. Milne

Research output: Contribution to journalArticlepeer-review


An unfilled tungsten bronze-structured ferroelectric ceramic, Ca 0.28Ba 0.72Nb 2O 6 (CBN28), has been doped with Y 3+ to produce ceramics with a nominal composition, (Ca 0.28Ba 0.72) 1–3w/2Y wNb 2O 6 [0 ≤ w ≤ 0.05]. The substitution of Y 3+ for Ca 2+/Ba 2+, and consequent additional vacancy formation, is assumed to occur on the A1/A2 sites. This resulted in a minor reduction of the c lattice parameter, and unit cell volume. For undoped CBN28, there was a slightly diffuse relative permittivity-temperature (ε r-T) peak at 268 ⁰C. The peak became much broader for sample compositions w = 0.04 and 0.05 and the peak temperature showed a level of frequency dependence consistent with weak relaxor behaviour. The polarisation-electric field loops became narrower for samples w = 0.04 and 0.05, corresponding to a reduction in remnant polarisation value, from 2.4 to 0.8 µC cm −2 (30 kV cm −1). The Y doped ceramics exhibited stable relative permittivity over a wide temperature range, the variation being within± 15% of the median value from 36 ⁰C to 218 ⁰C for w = 0.05, when measured at 1 kHz. Consequently, we suggest that A site donor-doping and aliovalent B site doping of CBN holds potential for industry standard, temperature stable, high temperature dielectrics (ɛ r ≥ 500 ± 15% from - 55–250 + ⁰C).

Original languageEnglish
Article number169891
JournalJournal of Alloys and Compounds
Early online date30 Mar 2023
Publication statusPublished - 25 Jul 2023


  • ceramics
  • ferroelectrics
  • dielectric response
  • Tungsten-Bronze
  • Dielectric response
  • Tungsten-bronze
  • Ceramics
  • Ferroelectrics


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