Question

CaO has the rock salt structure. Calculate its atomic packing factor.

Answer #1

Calculate the atomic packing factor (APF) for the FCC lattice
and find the theoretical density of FCC Ni (A=58.7g/mole, atomic
radius:0.1246 nm).

a) Sketch the unit cell for Ti3Au.
b) Calculate the atomic packing factor for Ti3Au
c) Calculate the density for Ti3Au

A certain material has a FCC crystal structure with an atomic
radius of 1.44 A° (1 A° = 10-8 cm), and an atomic mass of 197.
Calculate:
a) The lattice constant ‘a’ of unit cell in cm,
b) The atomic packing factor of the material.

Calculate structure factor S as a function of hkl for NaCl
structure (assume the atomic form factors f are constant but
different for Na and Cl) and discuss what would happen if the two
atoms had the same atomic form factor.

Calculate the atomic packing factor (APF) for the following:
(a) simple cubic unit cell with 1 atom per lattice point
(b) BCC unit cell with 1 atom per
lattice point
(c) FCC unit cell with 1 atom per lattice point

Calculate the packing efficiency of silver from its density,
knowing its atomic radius is 159 pm.

Derive the atomic packing fractions for the diamond structure
and for the monatomic fcc lattice. For the fcc
lattice, determine which real-space planes have the highest density
of atoms.

1.(a) MgO has the rock-salt structure. The MgO crystal has a
value of 0.514 for the radius ratio. The length of a side of the
unit cell for MgO is 4.24 Å.
(i) Draw the structure of this molecule.
(ii) Determine the radii of Mg
2+and O2-, assuming that the O
2-ions are in contact with one another.
(b) Define what is meant by the
“coordination
number” of a crystal
structure.
(c) Determine the coordination
number for each of the...

depending on temperature, RbCl can exist in either the rock-salt
or cesium-chloride structure. what is the coordination number of
the cation and the anion in each of these structures? ***
please explain everything you do ***

Titanium is bcc above 882 °C. The atomic radius increases 2%
when the bcc structure changes to hcp during cooling. Determine the
percentage volume change. Hint: there will be a change in atomic
packing factor. What ramifications might this have on forming
processes used to make biomedical implants?

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