Improved Pyroelectric Properties of CaBi 4 Ti 4 O 15 Ferroelectrics Ceramics by Nb / Mn Co-Doping for Pyrosensors

Yanxue Tang, Zong Yang Shen, Shujun Zhang, Thomas R. Shrout

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19 Scopus citations

Abstract

The pyroelectric properties of Nb(Mn)-doped and Nb/Mn co-doped CaBi4Ti4O15 (CBT) bismuth layer-structured ferroelectric ceramics were investigated. It was found that Nb/Mn co-doping resulted in stronger enhancement of pyroelectric properties than that of single Nb or Mn doping. The mechanism of doping effect was explained by the distortion of the [BO6] octahedra induced by the doped Nb and Mn cations occupying the B-site of the pseudoperovskite structure. A large pyroelectric coefficient of 84.4 μC/m2K was obtained at room temperature for Nb/Mn co-doped CBT (CBTN-Mn) ceramics, higher than that of pure, Nb or Mn-doped counterparts, being on the order of 35.9, 58.2, 44.0 μC/m2K, respectively. The enhanced pyroelectric coefficient together with reduced dielectric constant (99) and dielectric loss (0.002) led to greater improvement of figures of merit (FOMs), including FOMs for voltage responsivity (Fv ~ 3.95 × 10-2 m2/C) and detectivity (Fd ~ 2.44 × 10-5 Pa-1/2), in CBTN-Mn ceramics. Furthermore, the temperature variations of Fv and Fd were found to be 24% and 68%, respectively, over a broad temperature range from room temperature to 350°C, making CBTN-Mn ceramics potential candidate for high-temperature pyroelectric devices.

Original languageEnglish (US)
Pages (from-to)1294-1298
Number of pages5
JournalJournal of the American Ceramic Society
Volume99
Issue number4
DOIs
StatePublished - Apr 1 2016

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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