Ph.D. thesis (pdf) - dirac

126 Mean squared displacement
1.4
1.2
0.4
0.2
int [arb. units]
1
0.8
0.6
0.4
−0.6
10 K
0.2 0.50 A −1
−0.8 150 K
1.68 A −1 210 K
−1
0
0
0 50 100 150 200 250 300
1 2 3 4
T [K]
Q. 2 [A −2 ]
ln(int) [arb uni]
0
−0.2
−0.4
Figure 7.3: Illustration of the temperature and Q dependence of the measured elastic
intensity (DBP at atmospheric pressure). Left: the temperature dependence of the
intensity at two different Q-values. Right: The logarithm of the measured intensity
as a function of Q 2 at three different temperatures. The lines are fits to the Gaussian
approximation.
/ A 2
1.5
1
0.5
0.01 MPa
500 MPa
Tg
Tg @ 500 MPa
0
0 50 100 150 200 250
T / [K]
Figure 7.4: The mean square displacement of DBP as a function of temperature at
atmospheric pressure (dots) and at 500 MPa (full line). The vertical lines illustrate
the positions of T g at these two pressures.
[A 2 ]
0.8
0.6
0.4
0.2
0.01 MPa
500 MPa
Tg
Tg @ 500 MPa
0
0 50 100 150 200
T / [K]
Figure 7.5: The mean square displacement of cumene at atmospheric pressure
(squares) and 500 MPa (triangles). The vertical lines illustrate the positions of
T g at these two pressures.