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- The unit cells of SbCI3 are orthorhombic with dimensions a= 812 pm, b = 947 pm, and c = 637 pm. Calculate the spacing of (a) the {321} planes, {b} the {642} planes.How may the conductivity of an intrinsic semiconductor be increased?If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108b. 3.1 x 1010c. 6.2 x 1010d. 1.24 x 1011e. 3.1 x 1011 When compared to that of a covalent material, the short-range atomic structure of amaterial assembled using ionic bonding can be characterized as having a:a) higher coordination numberb) lower atomic packing factorc) higher atomic packing factord) lower coordinationnumbere) a and c only
- The unit cells of SbCl3 are orthorhombic with dimensions a = 812 pm, b = 947 pm, and c = 637 pm. Calculate the spacing, d, of the {321} planes.Calculate k1 for a hexagonal lattice of 1:4 cm radius natural uranium rods andgraphite if the lattice pitch is 20 cm.Discuss the reasons for the observation of dominant covalent bonding (but not ionic bonding) in semiconductors.
- What is the difference in energy between the valence band and conduction band of electrical conductors, semiconductors and insulators? Explain in scheme and give at least one example for each of that three types materials.How is electrolytic conductance measured experimentally?Poisson’s ratio for polyethene is 0.45. What change in volume takes place when a cube of polyethene of volume 1.0 cm3 is subjected to a uniaxial stress that produces a strain of 1.0 per cent?