List of top Material Science and Technology Questions on Crystal Structures

The number of atoms per unit cell of SCC are:

Which of the following statements are correct:
A. In SC structure a = 2r
B. In SC structure a = r/2
C. In BCC structure a = \( 4r/\sqrt{3} \)
D. In FCC structure a = \( 2\sqrt{2} r \)
Where a is a lattice parameter and r is the atomic radius.

Which of the following relations are correct for the cubic crystal:
A. a = b \( \neq \) c
B. a = b = c
C. \( \alpha = \beta = \gamma = 90^\circ \)
D. \( \alpha \neq \beta = \gamma = 90^\circ \)
Choose the correct answer from the options given below:

Copper has FCC structure with a lattice constant 3.61 Å. The radius of the copper atom is:

The correct statements about SC lattice are:
A. The number of atoms per unit cell is 1
B. Its packing factor is 0.52
C. Iron is an example of SC lattice
D. Its Coordination Number is 6
Choose the correct answer from the options given below:

Diamond exhibits which type of structures:

The coordination number and volume of unit cell of hexagonal closed packed structure are respectively:

Which type of liquid crystal has its structure twisted about the helical axis lying perpendicular to the orientation of molecules?

Powder diffraction experiments on samples of lead with X-rays of wavelength 1.44 $\text{\AA}$ produce (220) reflection at an angle of $32^\circ$. The lattice parameter of Lead is:

The attractive force between a pair of \(Li^+\) and \(Cl^-\) ions that touch each other is:

The angle between [111] and [001] directions in a cubic crystal is:

The number of symmetry elements in a cube are:

Gold and Platinum both have FCC structures with unit cell dimensions of \(4.08 \, \text{\AA}\) and \(3.91 \, \text{\AA}\), respectively. The metallic radii of atoms are:

The packing factor for diamond cubic silicon is

The interplanar spacing for cubic materials is given by the equation

Copper has an FCC crystal structure and a unit cell with a lattice constant of \(0.361 \, \text{nm}\). The interplanar spacing \(d_{111}\) is:

The planar density for (010) and (020) planes in simple cubic Polonium, which has a lattice parameter of 0.334 nm, is

Iron at 20◦C is BCC with atoms of atomic radius 0.124 nm. The lattice constant a for the cube edge of the unit cell is

The BCC iron, which has a lattice parameter of 0.2866 nm, has a density of

The packing factor for the FCC unit cell is

In an FCC unit cell, the number of lattice points is

The relationship between atomic radius (r) and lattice parameters (a) for a simple cubic (SC) structure is

The length of Burgers vector b in copper (Cu), which has an FCC crystal structure, is