Equation icon  Piezoresistivity

 
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Description: Stress over a conductor will induce a strain and therefore change the resistance of the conductor. In semiconductors, strain also causes a change in the material's resistivity, causing a much larger change in resistance. This change in material conductivity brought about by strain is known as piezoresistivity. Not related to the piezoelectric effect. Used primarily in strain gauges.

TeX format: \rho_\sigma = \frac{\left(\frac{\partial\rho}{\rho}\right)}{\left(\frac{\partial L}{L}\right)}

ρσ {\rho_\sigma} = Piezoresistivity
∂ρ {\partial\rho} = Change in resistivity (Ωm) {\Ohm m}
∂L {L} = Change in length (m) {m}
ρ {\rho} = Original resistivity (Ωm) {\Ohm m}
L {L} = Original length (m) {m}
Keywords: piezoresistivity • resistance • electrical • semiconductor • strain gauge
Categories: Science approaches
Applications > Electronics
Properties > Electrical, magnetic & optical > Semiconductivity
Properties > Electrical, magnetic & optical > Piezoelectric
Testing, analysis & experimentation > Electrical testing
Testing, analysis & experimentation > Mechanical testing
Other topics > Risk analysis
Created by: The University of Liverpool
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Date created: 12 July 2010
Date added: 04 August 2010
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Resource ID: 3193