Distinguish between substitutional and interstitial impurities with the help of a diagram.
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Calculate the volume of the unit cell for fcc Pb given that its atomic radius is 0.175 nm.
A crystal of iridium is irradiated by x-rays with a wavelength of 0.721 Å. Calculate the angle of reflection from the (111) plane, given that the lattice constant of iridium is 3.84 Å.
and
Obtain the volume of the primitive unit cell and the reciprocal lattice vectors.
List the symmetries observed in a methane molecule.
The binding energy of CsCl is 150 kcal mol-1 If the Madelung constant for CsCl is 1.763 and the repulsive exponent calculate the equilibrium interatomic distance
(Take
Farad
.)
How does the Fermi energy of n- and p- type semiconductors change with dopant concentration?
What are ferroelectric materials? Explain with the example of BaTiO3. How are they different from piezoelectric materials?