MSE 2101: MATERIALS
SCIENCE
AND ENGINEERING
Homework
Assignment
I
Read 2.5, p.24 to to 2.8, p.32.
Read all of chapter 3, EXCEPT:
p. 43 skip hexagonal
crystal structure,
p. 47 look only at
cubic and tetragonal.
Questions and Problems
2.14 (a) and (b) as they appear below; (c) Plot force F vs. r and determine
the bonding
energy, Eo. (d) Calculate
dF/dr for r
=roo
We will see later that dF/dr is related to the
elastic modulus of the material.
2.14,2.19,2.20,2.21
(answer 2)
3.8,3.9,
3.10, 3.11, 3.14 (answer 2)
3.31,3.36,
3.38,3.46,
3.48 (answer 2)
2.14 For a Na
+
-Cl-
ion pai~) attractive
and re~
pulsive
energies
EA
and
ER,
respectively,
depend
on· the distance
between
the ions
r,
according to
EA
= _ 1.436
r
For these expressions, energies
are expressed
in electron
volts per Na
+
-Cl-
pair, and
r
is
the
distance
in nanometers.
The net energy
EN
is just
the
sum
of the
two
expressions
above.
(a)
Superimpose
on a single plot
EN, ER,
and
EA
versus
r
up to 1.0 nm.
(b)