Biomedical Engineering Reference
In-Depth Information
Second order phase transition
0.00028
Curic temperature = 533K
Transition temperature = 533K
0.00024
0.00020
0.00016
0.00012
530
540
550
560
570
580
590
600
610
T (Kelvin)
Figure 14.15
Plot of T versus 1/
.
14.5 Conclusions
h e frequency-dependent dielectric dispersion of the present ceramics
synthesized by the solid-state reaction technique was investigated. h e
X-ray dif raction of the sample at room temperature shows a tetragonal
phase. h e frequency dependence of the dielectric loss peak is found to
obey the Arrhenius law with activation energy of 0.09 eV. An analysis of
the scaling behavior of the loss tangent suggests that the loss spectra are
temperature independent. h e relaxation mechanism has been discussed
in the framework of conductivity and electric modulus. h e dielectric
constant increases with the increases of temperature, which is due to the
space-charge polarization. h ese results suggest a Debye-type relaxation in
present material.
References
1.
J. Yoo, Y. Lee, K. Yoon, S. Hwang, S. Suh, J. Kim, and C. Yoo,
Jpn. J. Appl.
Phys.
, Vol. 40, p. 3256, 2001.
2.
J. Yoo, K. Yoon, Y. Lee, S. Suh, J. Kim, and C. Yoo,
Jpn. J. Appl. Phys.
, Vol. 39,
p. 2680, 2000.
