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Sunday, February 16, 2025
How to measure the amount of shear fracture in an impact test (ASTM A370 )
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How to measure the amount of shear fracture in an impact test (ASTM A370 )
8.3 Amorphous selenium used as a semiconductor material exhibits unusual diffusion characteristics. The following is a set of experimental data for self-diffusion in amorphous selenium. Calculate D0 and Q and comment on your results. T, °C D, m2 s–1 35 7.7 10–16 40 2.4 10–15 46 3.2 10–14 56 3.2 10–13
8.2 The diffusion rate of A in B was studied at 500°C and 850°C. It was found that, for the same diffusion time, the depths of penetration x1 and x2 in the two experiments were in the ratio of 1 : 4. Calculate the activation energy for diffusion of A in B.
