Electrophysical Properties of Microalloyed Alumo-Silicate Ceramics as Active Dielectric
2013
In this paper, electrophysical properties of porous alumo-silicate ceramics,
modified by alloying with magnesium and microalloying with aluminum, were
investigated. Complex multiphase system, as active microalloyed ceramics, has
specific behavior under influence of external electrical field, which
involves changes of dielectric losses and impedance, depending on frequency
and temperature. Dielectric properties were measured in the frequency range
20 Hz - 1 MHz. Values for permittivity (er) ranged between 140 - 430. Order
of magnitude for electrical resistivity was about 106 Ωm, for impedance 104 -
108 Ω, and loss tangent had values about and greater than 0.05. Current flow
through active dielectric takes place through dielectric barrier and
throughout conduction bands of thin aluminum and magnesium metal films.
Permittivity has nonlinear distribution and complex functional dependences
because of significant nonhomogeneity of active microalloyed ceramics. Lower
values of electrical resistivity are the result of complex electron and ion
transfer of charge through solid phase and pores, with decreased potential
barriers height, due to the influence of additives, ingredients and defects.
[Projekat Ministarstva nauke Republike Srbije, br. III 45012 i br. ON 172057]
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