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- The interplanar spacing of (220) planes of a FCC structure is 1.7458 Å. Calculate the lattice constant. a) 4.983 Å b) 2.458 Å c) 0 d) 5.125 ÅCompute the magnitude of the electrostatic attraction energy between a silver cation (radius 129 pm) and a sulfide anion (radius 170 pm). Give your answer in al.Suppose a pure Si crystal has 5 × 1028 atoms m-3. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and holes. Given that ni =1.5 × 1016 m-3.
- Which of the following lattice structure is the? reciprocal Lattice of FCC lattice FCC .a O BCC .b O HCP .C O SC .d OThe ionic crystal of NaCl has an fcc structure as shown below with the position of the Cl atom located at : (0 0 0); (½ ½ 0); ( ½ 0 %) and (0 ½) and Na atom is located at : (½ ½½) + fcc translation. The following are the physical data of NaCl: - Ionic radius Na = 0.98 A, Cl ion radius 1.81 A Atomic mass of Na = 22.99 amu, Atomic mass of Cl = 35.45 amu NaCl bulk modulus = 2.40 x 1010 N/m - Madelung's constant = 1.75 Young's modulus in the direction [100] = 5 x 1010 Nm-2 Debye temperature = 281 K - State the structural factors of NaCl, F in fNa and fCl (f = atomic scattering factor). Also determine the condition (h k 1) so that the value of F = 0.The elements A and B crystallize in bcc and fcc structures, respectively. Suppose that (i) the crystals of A and B have the same density, and (ii) the nearest-neighbor distances in these crystals are equal. Calculate the ratio MA/MB, where MA and MB denote the masses of the A and B atoms, respectively.
- Copper with an atomic radius of 0.128nm with a crystal structure of fcc type and atomic weight of 63.5g / mol calculate the density; if you know that the density of copper is 8.94g / cm3.What is the lattice constant for FCC crystal having atomic radius 1.476 Å? a) 1.476 Å b) 4.1748 Å c) 5.216 Å d) 0a. The term linear atomic density is derived for FCC [111], [100] the vectors in terms of radius b. Calculate the linear density of the two vectors of copper. 19:43 /
- An isolated zinc atom has a ground-state electron configuration of filled 1s, 2s, 2p, 3s, 3p, and 4s subshells. How can zinc be a conductor if its valence subshell is full?A brittle material has the properties Sut=30 kpsi and Suc=90 kpsi. Using the brittle Coulomb- Mohr and modified-Mohr theories, determine the factor of safety for the following states of plane stress. Ox=-15 kpsi, o,=10 kpsi, txy=-15 kpsi5. (a)How you conclude that the all superconductors are diamagnetic but all diamagnetic materials are not superconductors. (b)Determine the transition temperature and critical field at 4.2 K for a given specimen of a superconductor if the critical fields are 1.41 x 105 and 4.205 x 105 amp/m at 14.1 Kand 12.9 K, respectively.