Piezoresponse force microscopy and electron backscattering diffraction of 90° ferroelectric twins in BaTiO3 positive temperature co-efficient thermistors

M. Karimi-Jafari, A. Stapleton, Y. Guo, K. Kowal, D. Chovan, L. Kailas, A. Gandhi, K. O’Sullivan, A. Maher, S. A.M. Tofail, E. U. Haq

Research output: Contribution to journalArticlepeer-review

Abstract

The positive temperature co-efficient (PTC) of resistivity in BaTiO3 is a grain boundary effect, where the resistivity increases by several orders of magnitude near the transition temperature from ferroelectric (tetragonal) to paraelectric (cubic) phase. We combine electron backscatter diffraction (EBSD) and piezoresponse force microscopy (PFM) to investigate the crystallographic orientation, topography, and intergranular polarization in polycrystalline PTC BaTiO3 ceramics leading to PTC effect. EBSD study showed that while macroscale BaTiO3 displayed no overall preferential crystallographic orientation, individual grains had preferred orientations at a localized level. Twinning patterns were revealed by EBSD and PFM images showing classical 90° ferroelectric domain patterns.

Original languageEnglish
Pages (from-to)109-119
Number of pages11
JournalFerroelectrics
Volume559
Issue number1
DOIs
Publication statusPublished - 25 Apr 2020

Keywords

  • Barium titanate
  • ferroelectric domains
  • piezoelectricity
  • piezoresponse force microscopy
  • thermistors

Fingerprint

Dive into the research topics of 'Piezoresponse force microscopy and electron backscattering diffraction of 90° ferroelectric twins in BaTiO3 positive temperature co-efficient thermistors'. Together they form a unique fingerprint.

Cite this