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Electrical conduction mechanism of rare-earth calcium oxyborate high temperature piezoelectric crystals

Journal Article


Abstract


  • The electrical conduction behavior of piezoelectric crystals is critical in the design of piezoelectric sensors for use at elevated temperatures. The electrical resistivity and dielectric properties of rare-earth calcium oxyborate crystals ReCa4O(BO3)3 (ReCOB, Re = Y, Gd and Pr) are investigated in this report. The relationships between the electronic structures and electrical properties are then determined using X-ray photoelectron spectra and first principle calculations. Among the ReCOB type crystals, YCOB is found to possess the highest electrical resistivity and lowest dielectric loss. Nonlinearity of the electrical resistivity as a function of temperature for ReCOB crystals is then confirmed, corresponding to different conduction mechanisms. It is also revealed that the electrical conductivity of ReCOB type crystals is heavily influenced by oxygen vacancy defects at relatively lower temperatures (below ∼600 °C), while both vacancy defects and band gap contribute to conductivity at elevated temperatures (above ∼600 °C).

UOW Authors


  •   Tian, Shiwei (external author)
  •   Li, Lili (external author)
  •   Lu, Xinyu (external author)
  •   Yu, Fapeng (external author)
  •   Li, Yanlu (external author)
  •   Jiang, Chao (external author)
  •   Duan, Xiulan (external author)
  •   Wang, Zhengping (external author)
  •   Zhang, Shujun
  •   Zhao, Xian (external author)

Publication Date


  • 2020

Citation


  • Tian, S., Li, L., Lu, X., Yu, F., Li, Y., Jiang, C., Duan, X., Wang, Z., Zhang, S. & Zhao, X. (2020). Electrical conduction mechanism of rare-earth calcium oxyborate high temperature piezoelectric crystals. Acta Materialia, 183 165-171.

Scopus Eid


  • 2-s2.0-85074986315

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3897

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 165

End Page


  • 171

Volume


  • 183

Place Of Publication


  • United Kingdom

Abstract


  • The electrical conduction behavior of piezoelectric crystals is critical in the design of piezoelectric sensors for use at elevated temperatures. The electrical resistivity and dielectric properties of rare-earth calcium oxyborate crystals ReCa4O(BO3)3 (ReCOB, Re = Y, Gd and Pr) are investigated in this report. The relationships between the electronic structures and electrical properties are then determined using X-ray photoelectron spectra and first principle calculations. Among the ReCOB type crystals, YCOB is found to possess the highest electrical resistivity and lowest dielectric loss. Nonlinearity of the electrical resistivity as a function of temperature for ReCOB crystals is then confirmed, corresponding to different conduction mechanisms. It is also revealed that the electrical conductivity of ReCOB type crystals is heavily influenced by oxygen vacancy defects at relatively lower temperatures (below ∼600 °C), while both vacancy defects and band gap contribute to conductivity at elevated temperatures (above ∼600 °C).

UOW Authors


  •   Tian, Shiwei (external author)
  •   Li, Lili (external author)
  •   Lu, Xinyu (external author)
  •   Yu, Fapeng (external author)
  •   Li, Yanlu (external author)
  •   Jiang, Chao (external author)
  •   Duan, Xiulan (external author)
  •   Wang, Zhengping (external author)
  •   Zhang, Shujun
  •   Zhao, Xian (external author)

Publication Date


  • 2020

Citation


  • Tian, S., Li, L., Lu, X., Yu, F., Li, Y., Jiang, C., Duan, X., Wang, Z., Zhang, S. & Zhao, X. (2020). Electrical conduction mechanism of rare-earth calcium oxyborate high temperature piezoelectric crystals. Acta Materialia, 183 165-171.

Scopus Eid


  • 2-s2.0-85074986315

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3897

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 165

End Page


  • 171

Volume


  • 183

Place Of Publication


  • United Kingdom