4. About the surface energy; (a) The surface energy of a single crystal depends on the crystallographic orientation with respect to the surface. Explain why this is so. (b) For an FCC crystal, such as aluminum, would you expect the surface energy for a (100) plane to be greater or less than that for a (111) plane? Why?

Q: Calculate the planer density of planes (0:-1:-1) for BCC, and FCC crystal structures?

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Q: The maximum wavelength of light that a certain silicon photocell can detect is 1.11 μm. (a) What is…

A: The energy difference between the top valence band and bottom of conduction band in terms of…

Q: Q4: In the calcium fluorite. CaF2 structure, atoms occupy the position of % % %, which is not filled…

A:

Q: How can we calculate the packing efficiency of the two-dimensional lattice?

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Q: Two patterns of packing two different circles of the samesize are shown here. For each structure (a)…

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Q: (a) Draw the unit cells of i) FCC and ii) BCC. In the FCC unit cell, sketch and label one of the…

A: Where, FCC is the Face centered Cubic unit and the BCC is the Body centered Cubic unit, FCC and BCC…

Q: (a)What are intrinsic semiconductors? Give an example.(b) What is the distance between Na+and Cl–…

A: Semiconductors are those substances which have conductivities in between the metals and nonmetals.…

Q: Pure iron has a change in crystal structure from BCC to FCC when heating up above 2. a) 912°C. If…

A:

Q: Calculate the mass density of diamond assuming that it is a close-packed structure of hard spheres…

A: a) Radius of close packed hard sphere is Mass of diamond is 12.01 g/mol. Considering close-packed…

Q: a) A solid substance is considered to be orthorhombic in nature. Since the edges of the unit cell…

A: The d is the interplanar spacing and it is defined by the spacing between the adjacent planes which…

Q: Q4: In the calcium fluorite. CaF2 structure, atoms occupy the position of % % %, which is not filled…

A:

Q: The angle of a Bragg reflection from a set of crystal planes separated by 99.3 pm is 20.85°.…

A:

Q: What is the difference in energy between the valence band and conduction band of electrical…

A: Insulators have large energy gapSemi conductors have somewhat less energy gap than insulators…

Q: The unit cell for tin has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318…

A: From given a and b lattice parameters and density, atomic weight, atomic radius we are calculating…

Q: When you shine light of band gap energy or higher on asemiconductor and promote electrons from the…

A: The conductivity of semiconductor is possible due to the transfer of an electron from the valance…

Q: Iron (II) oxide (FeO) is a ceramic that has the same crystal structure as NaCl. Given: R(Fe2)= 0.087…

A: The correct option is g : 0.59

Q: 2. What is glass-ceramic? Please explain the differences between glass and glass & ceramics ?…

A: Answer - Glass-ceramic - a glass-ceramic is a solid material, partly crystalline and partly glassy,…

Q: What is the temperature and length of time it takes for boron-doped graphene to diffuse into…

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Q: b) Calculate the atomic packing factor for a metal that has a cubic unit cell with a lattice…

A: A unit cell is the regular repeated three-dimensional arrangement that makes up he entire lattice.…

Q: Determine the repeat distance, linear density, and packing fraction for FCC nickel, which has a…

A:

Q: How do you find the density of Ca metal based on the unit cell properties

A: To determine the density for Ca unit cell, the type of unit cell has to be identified first. From…

Q: Calculate the mass fractions of phases present in an alloy of lead tin with 35% Sn and 65%Pb and at…

A:

Q: a) It is considered that a solid substance has an orthorhombic structure, Since the edges of the…

A:

Q: 3- Determine the Miller indices for the A and B planes shown in the following unit cell:

A: Miller indices is the reciprocal of the intercepts of the plane on the axis. The value should always…

Q: (a) In the cubic crystal structures, as the values of the Miller indices (h, k, and 1) increase,…

A: Miller indices are group of three values (hkl) that indicates the set of parallel planes of atoms in…

Q: QI. Calculate the linear density of directions [011] for BCC, and FCC crystal structures?

A: Body centred cubic close packing is represented as BCC whereas face centred cubic close packing is…

Q: Sodium metal with a bcc structure has two atoms per unit cell. The radius of the sodium atom is 1.85…

A: Mean free time = me/q2np  Here,  me is the effective mass of the conduction electrons  =…

Q: Will the presence of Frenkel defects change the measured density of a crystal?

A: Frenkel defect: It an ion is missing from its lattice site that means causing a vacancy or a hole…

Q: In terms of band theory, what is the difference(i) between a conductor and a semiconductor?(ii)…

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Q: A crystal has a cubic unit cell of 4.2 Å. Using a wavelength of 1.54 Å at which 2θ value would you…

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Q: The band gap energy of semiconductor LED is 3.0ev What is the wavelength of maximum corresponding…

A: Wavelength can be calculated using the given equation: E =  hcλ

Q: Calculate the IPF (ionic packing factor) for UO2, which has the fluorite (CaF2) structure…

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Q: calculate the d and 2θ positions for the 111 plane expected in the diffraction pattern as a result…

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Q: 3. Explain how trace levels of CaCl, impurity in an NaCl crystal would affect the seil-diffusion…

A: Crystal lattices are regular, repetitive arrangements of ions or groups in space. It is the smallest…

Q: A crystal of FeO was found to have a unit cell dimension of 4.501Å, a measured density of 5.828…

A: Solution :      We can determine the defect in the sample of non-stoichiometric compounds. This can…

Q: Sketch [0110] and [2243] in an HCP unit cell.

A: Solution: We will draw a hexagonal unit cell with ruled co-ordinate system as follows: Point O is…

Q: Sketch the electronic band structure of a semiconducting material, and give an example for an…

A: Semiconductors  The conductivity of semiconductors lies between conductors and insulators. The…

Q: A substance has a band gap of 0.85 eV at 273 K. Is this substance best classified as an insulator, a…

A:

Q: Calculate the number of atoms/cm2 on the plane (100) of lead (FCC) for which the size of the unit…

A: Planar density: It is defined as the number of atoms divided by unit area of crystallographic plane.…

Q: 4. Compare and contrast SC, BCC, FCC and HCP in terms of coordination number, number of atoms per…

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Q: 1.List the point coordinates for all atoms that are associated with the FCC unit cell.

A: FCC cell refers to Face centered cubic lattice in which the atoms are present at the center of each…

Q: Is gallium-doped germanium a p-type or n-type semiconductor?

A: Gallium-doped germanium is a p-type semiconductor.

Q: What is the effect of temperature on molar conductivity?

A: The effect of temperature on molar conductivity has to be given,

Q: B: Define the coordination number and its value for BCC unit cell.

A: BCC: body centred Cubic unit cell.  The structure and coordination number explained below.…

Q: How does the band gap differ in metals, semiconductors, andinsulators?

A: Band gap is the energy gap between conduction band and valence band. In metals, the band gap between…