Pyroelectric properties of calcium doped strontium barium niobate ceramics Sr0.65−xCaxBa0.35Nb2O6 (x = 0.05–0.425)

Yingbang Yao, Kailong Guo, Daoguang Bi, Tao Tao, Bo Liang, C. L. Mak, S. G. Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

Calcium-doped strontium barium niobate ceramics Sr0.65−xCaxBa0.35Nb2O6 (SCBN, 0.05 ≤ x ≤ 0.425) were prepared by solid state reaction method. From the X-ray diffraction patterns and Raman spectra, it was found that calcium was completely dissolved into the tetragonal tungsten-bronze (TTB) crystal structure upto x = 0.20, above which second phase CaNb2O6 (CN) was formed. Diffuse phase transitions was observed in all the samples. The Curie temperature of the SCBN ceramic was increased from 60 to 103 °C with the calcium dopant. Frequency (2–200 mHz) and temperature (25–110 °C) dependence of the pyroelectric coefficient were measured. From the frequency profile of the pyroelectric coefficient, the thermal diffusivity was determined. Due to the low Curie temperature, all samples experienced serious thermal depolarization and the pyroelectric coefficient was greatly decreased during the cooling round. The sample with x = 0.125 shows the largest pyroelectric coefficient of 237 µC/m2k. The piezoelectric coefficient (d33) was also increased after calcium doping.

Original languageEnglish
Pages (from-to)17777-17785
Number of pages9
JournalJournal of Materials Science: Materials in Electronics
Volume29
Issue number20
DOIs
Publication statusPublished - 1 Oct 2018

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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