Structure.questions XI answer

Structure.questions XI answer - MTLE-2100 Structure of...

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MTLE-2100 Structure of Engineering Materials, Questions XI- answer 1. What type of point defects will be found? In 1) solid solution of CaCl 2 in NaCl. Ca Na V Na 2) solid solution of CaO in ZrO 2 . Ca Zr ’’ V O •• 3) solid solution of Y 2 O 3 in ZrO 2 . Y Zr V O •• 2. What is the electric conduction mechanism in Ca x Zr 1-x O 2-x ? How does the electric conductivity change with x? Oxygen ionic conduction. The conductivity increases with increasing x. 3. Diffusion under a constant surface concentration (e.g. C diffusion into Fe under constant carbon atmosphere, or H 2 O diffusion into SiO 2 glass under constant water vapor pressure) is given by C (x,t) = C 0 [ 1- erf (x/2 Dt)], where C 0 is the surface concentration and erf(z) is error function defined by erf (z) = (2/ √π ) exp (- ε 2 )d ε If water diffused 0.2 mm into silica glass at 1000 ° C after 400 hours, how far will it diffuse in 6000 hrs at the same temperature? Sketch the expected concentration profiles for the above two times.
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Structure.questions XI answer - MTLE-2100 Structure of...

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