DOC.
4
KINETIC THEORY LECTURE NOTES
191
j =
F(a)
*o
/ RT
a
L
MWIo
o
I
In this
way we
obtain relation between
_
and
T.
o
We seek
temperature
at which
ferromag-
netism vanishes.
We obtain
I0M
RT
1
T
_
1MWI0
_
1
HMW
m
MWI0
3
m
~
3
R
~
3 pR
Hence,
the
above
equations
for the deter-
mination of the
curve can
also be
written
as
L
=
F(a) (remains)
0
I
1
T
a
I0
3
T
T
I
By eliminating
a, one
obtains
a
relation
between
-
and
-
that
is
independent
of the
o
nature of the
substance. Shows
satisfactory
agreement
with
experiment.[85]
Contribution to
Specific
Heat
If
a
molecular
magnet
changes
its
position
under the
influence
of the
field
H,
then the
work
is
H
2mdz
=
H
2md(X
cos
ö)
=
H
d(ucosu)
If
many
elementary
magnets are
present,
then the
work
H.dEUcost,
or
HdI
per
unit
volume will
be
performed.
[p.
42]