Describe the structure of a spinel ferrite
Spinel ferrites, a class of magnetic ceramics, have a general formula AB2O4, where A and B are metal ions. In the __________ _____ ____ ________ _____.
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Explain with the help of diagrams the magnetism in a superconductor when it is cooled in the presence of a magnetic field.
Describe the different types of polymerization processes with an example of each.
The unit cell size of KCl is 6.3 Å and the Young’s modulus in the [100] direction is 3.8 1010 Nm-2 . Estimate the wavelength at which electromagnetic radiation is strongly reflected by a crystal [Atomic weight of K = 39 and Cl = 37].
The density of copper is 8.92 103 kg m-3 and its atomic weight is 63.5. Assuming that each copper atom provides one conduction (free) electron, calculate the density of conduction electrons. Also estimate the relaxation time for free electrons applying classical free electron theory. What is the corresponding mean free path? Take the electrical conductivity of copper to be 6.8
107
m-1 .
The primitive lattice vectors of a lattice are given by
Determine the volume of the primitive cell and the reciprocal lattice vectors.
Derive an expression for the velocity of the transverse wave in the [100] direction in a cubic crystal.
For an intrinsic semiconductor with energy gap Eg = 0.85 eV, determine the position of the Fermi level at 300 K if 6me . Also calculate the density of electrons and holes at 300 K.