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- Title
Impact of mechanical stress on barium titanate-based positive temperature coefficient resistive material.
- Authors
Pu, Yongping; Zhang, Lei; Keil, Peter; Novak, Nikola; Frömling, Till
- Abstract
The sensitivity toward mechanical stress of barium titanate-based positive temperature coefficient resistor material was investigated by determining the resistance change with application of uniaxial stress from room temperature to 200 °C, which is well above the Curie temperature TC. Using the Landau-Ginsburg-Devonshire theory the resistance increases in the paraelectric state, the negligible impact of stress close to TC and the observed increase in TC with increasing stress could be rationalized. For the ferroelectric state, the stress-related resistance increase was attributed to ferroelasticity, a change in bulk permittivity and interfacial stress inducing a piezoelectric potential. The obtained results are also discussed with respect to recent endeavors to tune properties of potential barriers in piezoelectric semiconductors by mechanical stress.
- Subjects
MECHANICAL stress analysis; BARIUM titanate; MATERIALS testing; TEMPERATURE coefficient of electric resistance; PIEZOELECTRIC semiconductors; FERROELASTICITY; PERMITTIVITY measurement; STRAINS &; stresses (Mechanics)
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 24, p16243
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2802-6