Homework Answers
Answer:
Interstitial diffusion is faster than vacancy diffusion.
Reasons:
- Interstitial diffusion occurs only for the atoms having small size ,so that it can be easily fit in the interstitial space.This small atoms has more interstitial space than that of space in vacancy diffusion.
- Interstitial space bonds with its surrounding atoms are weaker than that of the bonds between atom to atom.
- Small atoms such as Hydrogen ,Carbon are the ones which can show interstitial diffusion.Speed of diffusion is mainly dependent on the diffusion coefficient.If diffusion coefficient is high, then the speed will be high.Let us consider For interstitial diffusion to occur diffusing atom should be significantly smaller than the host atom(in terms of atomic radius).Diffusion coefficient depends mainly on temperature.If temperature is high,diffusion coefficient will also be high.
- By considering a standard table of diffusion data,Copper in Aluminium will be interstitial diffusion(because copper has significantly less atomic radius than Aluminium),and the diffusion coefficient will be in terms of 10-14 m2/s.If we consider the the other case of Zinc in Copper which will be vacancy diffusion(Zinc has higher atomic radius than Copper) ,here the diffusion coefficient will be of the range of 10-18m2/s.
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5. It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this...
It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by...
It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by comparing the values of diffusion coefficients of a pair of cases (one values for each type of diffusion) from Table 5.2......(5 points)
It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by...
It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by comparing the values of diffusion coefficients of a pair of cases (one values for each type of diffusion) from Table 5.2...... (5 points) Describe a real example of Fick's first law of diffusion....(2 points)
5. It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this...
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It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by comparing the values of diffusion coefficients of a pair of cases (one values for each type of diffusion) from Table 5.2......(5 points)
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5. It is believed that interstitial diffusion is faster than vacancy diffusion. Can you show this by comparing the values of diffusion coefficients of a pair of cases (one values for each type of diffusion) from Table 5.2.. -(5 points) Diffusing Species Q. (J/mol) с 87,400 148,000 77,000 168,000 Nº N° Feº Fe Cud Alº Mg Znº Mod Host Metal D, (m/s) Interstitial Diffusion Fe (1 or BCC) 1.1 x 10-6 Fe (I or FCC) 2.3 * 105 Fe (...
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Each question can be more than
one correct answers.
3) Gas diffusion layers for PEM fuel cells: a) must be hydrophobic in order to hydrate the electrolyte b) show a lower porosity than MPLS c) are electronic conductors d) are responsible for crossover losses 4) Piezopolymers: a) do not show ferroelectric properties b) are able to maintain dipoles alignment c) show a perovskite lattice d) do not exhibit saturation polarization
please show work
14. The rate of solvolysis of iodide 1 is 100 times faster than the rate of solvolysis of iodide 3. What explanation (with structures) can you provide for the difference in reaction rates. Use aromaticity concepts!!(5 pts) OCH CH2OH Rate=100 tool tour CH3OH Rate=1.0
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