Tuesday, December 2, 2014

Measurement of the temperature coefficient of Young's modulus of single crystal silicon and 3C silicon carbide below 273 K using micro-cantilevers

    • Highlights

      Measurement of the temperature coefficient of Young's modulus of Si in the temperature range of 200–290 K.
      Measurement of the coefficient of SiC in the range of 210–295 K.
      Temperature coefficient of Young's modulus of silicon: −52.6 ± 3.45 ppm/K.
      Temperature coefficient of Young's modulus of silicon carbide: −39.8 ± 5.99 ppm/K.

      Abstract

      This paper reports on the measurement of the thermal coefficient of Young's modulus of both single crystal silicon and 3C silicon carbide over the temperature range spanning 200–290 K. The thermal coefficients were determined by monitoring the change of resonance frequency of micro-cantilevers as their temperature was reduced. The thermal coefficient of Young's modulus, 1/E · δE/δT was measured to be −52.6 ± 3.45 ppm/K for silicon and −39.8 ± 5.99 ppm/K for 3C silicon carbide, agreeing well with theoretical predictions, and also with experimental values that have been previously published for temperatures above 273 K. This work has therefore expanded the temperature range over which the thermal coefficient of Young's modulus has been measured to below 273 K and towards the temperatures required for low-temperature military and space applications.

      Keywords


      Single crystal silicon carbide;
    • Young's modulus
    • Low temperature
    • MEMS cantilever
    • Laser vibrometry
    • Silicon carbide

  • Soure:Sciencedirect

    If you need more information about single crystal, please visit our website:http://www.qualtiymaterial.net, send us email at sales@qualitymaterial.net