Explain the difference between chemical vapour deposition and physical vapour deposition. What are the requirements of a material to be used as a holder for the charge in a thermal evaporation system? Mention any three materials used for the purpose.
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Explain the difference between chemical vapour deposition and physical vapour deposition. What are the requirements of a material to be used as a holder for the charge in a thermal evaporation system? Mention any three materials used for the purpose.
What is luminescence of a material? Differentiate between fluorescence and phosphorescence.
Explain Lever rule with appropriate diagram.
The enthalpy of vacancy formation in nickel is , and its melting point is
. What is the equilibrium vacancy concentration in nickel at
?
How do the interactions between the substrate and adsorbate atoms determine the growth mode of thin films? Describe the various modes of thin film growth.
What is F centre defect? Why is there a characteristic absorption energy associated with the F centre? If the F centre absorption energy for CsCl is 2.0 eV, what is its characteristic absorption wavelength?
Differentiate between ferromagnetism, antiferromagnetism and ferrimagnetism with examples. State the physical significance of magnetic anisotropy.