DocumentCode :
3169702
Title :
A stress-sensing ceramic device based on PTCR barium titanate
Author :
Capurso, Joseph S. ; Schulze, Walter A.
Author_Institution :
New York State Coll. of Ceramics, Alfred Univ., NY, USA
fYear :
1991
fDate :
33457
Firstpage :
731
Lastpage :
734
Abstract :
Positive temperature coefficient of resistance (PTCR) barium titanate is used as the base material for a ceramic sensor which employs piezoresistivity to detect changes in applied stress. Tape-cast sheets of undoped (insulating) and PTCR (semiconducting) BaTiO3 are laminated to produce a three-layer “trilaminate”-a sintered structure which has two PTCR layers separated by an insulating layer. The trilaminate is exposed to mechanical stress in a four-point bend configuration (placing one semiconducting layer completely in tension, the other in compression), and the resistivities for both stress states are measured concurrently as functions of the applied stress magnitude. The piezoresistivity coefficient (π) is calculated from the slope of the linear resistivity-stress response. Piezoresistivity results are presented versus PTCR layer composition (counterdopant species) and furnace cooling conditions (grain boundary oxidation level). These results are interpreted with respect to Heywang´s model of the gain boundary potential barrier
Keywords :
barium compounds; electric sensing devices; ferroelectric semiconductors; grain boundaries; laminates; piezoceramics; piezoelectric transducers; piezoresistive devices; stress measurement; BaTiO3; Heywang´s model; PTCR BaTiO3; applied stress; four-point bend configuration; furnace cooling conditions; gain boundary potential barrier; grain boundary oxidation level; insulating layer; linear resistivity-stress response; mechanical stress; piezoresistivity coefficient; positive temperature coefficient of resistance; semiconducting layer; sensor; sintered structure; stress-sensing ceramic device; tape-cast sheets; trilaminate; Barium; Ceramics; Insulation; Piezoresistance; Semiconductivity; Semiconductor materials; Sheet materials; Stress; Temperature sensors; Titanium compounds;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
Type :
conf
DOI :
10.1109/ISAF.1994.522473
Filename :
522473
Link To Document :
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