Answers are grounded in this paper and cite their sources.
The anomalous resistive and piezoresistive characteristics of BaTiO3−x ceramics and single crystals are related to domain orientations. It is proposed that an anisotropy in resistivity exists in the different crystallographic directions in the tetragonal phase, reaching a maximum at the tetragonal to orthorhombic transition. A small stress is sufficient to change domain orientations resulting in a large piezoresistive effect (secondary piezoresistivity) because of the anisotropy of resistivity. The change in resistivity was found to be proportional to strain.
No takes yet. Share an insight, caveat, or question.
Brenton L. Mattes (1963) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: