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conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4
th
International Conference and Expo on
Ceramics and Composite Materials
Impedance spectroscopy theory and applications
Nasr Sdiri
National Center of Researches in Materials Sciences, Tunisia
I
mpedance spectroscopy (IS) is the measurement of electrical impedance, admittance, or some other closely related quantity
as a function of frequency. It is used to resolve processes of electrical polarization according to their relaxation frequencies
or time constants. The technique can be used to characterize ionic or electronic conductors as well as dielectric materials. It is
commonly applied to electro ceramics, solid electrolytes, dielectrics, including polymers and glasses, and to integrated energy
conversion devices such as batteries and fuel cells. Material Impedance spectroscopy is a powerful technique used for the
characterization of electrical proprieties of materials (ceramics, polymers,..) and for investigation of Kinetics of reactions in
materials. These properties are temperature dependent. Impedance spectroscopy provides the contribution of different micro
structural features of a material in the row impedance of materials (grains, grain Boundaries,..). This technique has the inherent
potential of non-destructive testing. The principle of the impedance spectroscopy experiment is to apply a sinusoidal electrical
stimulus (either voltage or current) to a sample and observe the response (respectively current or voltage). The data resulting
from such a measurement (usually a list of f, Z
re
, Z
im
) are analyzed using a complex nonlinear least squares (CNLS) fitting
code, to determine the parameters of a circuit equivalent. Through the system in terms of amplitude and phase shift compared
to voltage-time function. The complex value of impedance can thus be described in terms of its real and imaginary values at
different frequencies. The results of an impedance measurement can be graphically demonstrated using bode and Nyquist or
Cole-Cole plot for all applied frequencies. In this presentation, I will present our research on impedance techniques:
• Electrical conductivity and dielectric analysis of the perovskite La
0.7
Ca
0.3
xK
x
M
n
O
3
(x = 0.00, 0.05 and 0.10).
• Studies of (90-x) P
2
O
5
-xB
2
O
3
-10Fe
2
O
3
glasses by impedance spectroscopy methods (x = 0 mol.%, 10 mol.%, 20 mol.%, 30
mol.%,40 mol.%)
• 10B
2
O
3
–(90 − x) P
2
O
5
− xNa
2
O) with x=0, 5, 10, 15, 20 mol%.
sdirinasr@yahoo.frRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015