Piezoresistive ceramic sensor based on PTCR barium titanate

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:28855

Capurso, J S; Schulze, W A; Alles, A B ^[1]

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1. Alfred Univ., NY (United States)

High purity, chemically prepared barium titanate was doped with 0.3 atom% La and 0.04 atom% Mn by precipitation. Using standard techniques, tape-cast sheets of the PTCR composition as well as the base insulating powder were made. A three-layer sensor was laminated with the upper and lower PTCR layers separated by an insulating BaTiO{sub 3} layer. After binder burnout, the device was sintered at 1350{degrees}C in flowing N{sub 2} followed by cooling in flowing O{sub 2} at 300{degrees}C/hour. The sensor was loaded using a standard four-point bend test configuration. The change in resistivity with increasing load was observed to the linear, with positive and negative piezoresistive coefficients for the PTCR layers under compression and tension, respectively. These trends are in general agreement with the Heywang-Jonker model of grain boundary potential barriers.

• OSTI ID: 28855
• Report Number(s): CONF-931142--; CNN: Grant AL03-92-G-0374
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRICAL PROPERTIES
FABRICATION
GRAIN BOUNDARIES
LAMELLAE
LANTHANUM
MANGANESE
METALLURGICAL EFFECTS
PRESSURE GAGES
SEMICONDUCTOR DETECTORS
TITANIUM OXIDES