Question

Determine the coordination numbers and crystal structure for the following ceramics:

**a)** SiO_{2}

**b)** BaO

**c)** Al_{2}O_{3}

Answer #1

The coordination number and APF of an HCP crystal structure
is

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...

1.
The coordination number of anions in a crystal of CaF2 is 4. What
is the coordination number of cations?
2. What is the symbol for the ion that contains 20 protons, 18
electrons, and 20 neutrons?
A) 40Ca^2+
B) 20Ca^2+
C) 40Ca^1+
D) 40 Zr^2+

What are the cation and anion coordination numbers and
geometries of the following & explain why all of the ions do
not have the same coordination numbers.
Sodium Thallium, Copper (III) Gold, Zinc Blende, Cadmium Iodide,
and Cesium Chloride?

PtSe2 monolayer is a 2-dimensional material that has
a hexagonal crystal structure.
a. Determine the unit cell equation in real space and reciprocal
space.
b. Calculate the schematic graph of the real space and reciprocal
space in the first Brillouin zone!
c. Determine the high symmetry points in the reciprocal space!

BCC (body-centered cubic) crystal structure is one of common
crystal structuresfor metals. Please do the following
questions.
(a) Describe what is a BCC structure and draw a BCC unit
cell.
(b) Calculate the radius of a vanadium (V) atom, given that
V has a BCCcrystal structure, a density of 5.96 g/cm3,
and an atomic weight of 50.9 g/mol.

A.) Balance the following equation and find the Stoichiometry:
SiO2+C=Si+CO (I balanced it out as 1SiO2+2C=1Si+2CO and for the
Stoiciometry, would it be SiO2=1,C=2, Si=1 and CO=2?)
B.) Determine how many moles and grams of SiO2 and C will be
needed to make 25.80mole of Si.
C.) Determine how many moles and grams of waste CO will be
produced.

Determine the empirical formula of the compound with a crystal
structure where beryllium ions occupy one-half of the tetrahedral
holes in a cubic close-packed (ccp) array of selenium anions.

Magnesium (Mg) has an HCP crystal structure, a c/a ratio of 1.624,
and a density of 1.74 g/cm^3. Compute the atomic radius for
Mg.

(2 pts) For the octahedral complex ion
[FeCl6]3- answer the following
questions:
a. What is the coordination number for
iron? ____________
b. What is the oxidation number for the iron
ion? ________________
c. What is the electron configuration for the
iron ion? _________________
d. Using crystal field theory,
i. Draw the ground state distribution for the iron
cation’s d electrons. Indicate whether the crystal field
splitting is large or small.
ii. Determine whether the compound is diamagnetic or
paramagnetic (this should be evident from your sketch.)
Diamagnetic or paramagnetic? _________________

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