Abstract
The Young's modulus of polycrystalline diamond grown by microwave assisted chemical vapour deposition was determined by a dynamic three-point bending measurement between room temperature and 750°C. The room temperature Young's modulus was approximately one-half of the theoretical value of 1143 GPa. The lower Young's modulus was traced back to voids and microcracks and therefore a smaller effective sample cross-section. Also, the density of the the polycrystalline samples of 3.387 g cm−3 was smaller compared with single crystal diamond. Up to temperatures of 600°C the Young's modulus remains approximately constant. At higher temperatures the onset of diamond etching in air leads to a strong reduction of the Young's modulus. At 750°C the Young's modulus drops linearly with −10.4 GPa/min to one-thired of its initial value before sample fracture occurs. The onset of diamond etching at these temperatures was proved by thermogravimetric measurements.
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