Volumen II - SAM

Congreso SAM/CONAMET 2009 Buenos Aires, 19 al 23 de Octubre de 2009
background generation. The constantτ0B is the pre-exponential factor of the Arrhenius law and k is the
Boltzmann constant.
M 2 [GPa]
10
8
6
4
2
0
local minimum
200 400 600 800 1000 1200
T [K]
Figure 1. Loss modulus showing background and peak.
Standard procedures [8] to estimate the background usually assume that the peak contribution is negligible
for temperatures higher than the local minimum shown in Figure 1. This is not true in general, since this
point represents the temperature where the derivatives of both functions have approximately the same
absolute value, and the peak function can be significant even for higher temperatures. However, since the
peak function decreases to zero on both sides of its maximum, far from the peak temperature the modulus is
almost entirely dominated by the background. This means that the area between the curves that describe the
peak and the background, must go to zero quickly for temperatures significantly different from the peak.
Figure 2 shows an example of this idea.
M 2
Temperature
Figure 2. Area between peak and background functions.
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