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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.Which of the following lattice structure is the? reciprocal Lattice of FCC lattice FCC .a O BCC .b O HCP .C O SC .d O
- 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.The 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?5. (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.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 kpsi
