Theoretical Studies of the Properties of Ferroelectric Ceramic-Polymer Composite Materials
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Date
1994-02
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Addis Ababa Universty
Abstract
The existing theories which are used to interpret
experimental data on the dielectric, elastic and piezoelectric
properties of composite materials are summarized. An effective
medium theory which treats both components symmetrically has been
investigated to show that the geometric factors are important
parameters which could take care of both the effects of shape of
inclusions and the concept of connectivity, and to demonstrate
that the shape of inclusions greatly affect the dielectric,
elastic and piezoelectric properties of composite materials.
The properties of composite materials are studied as a
function of the PZT volume fraction and the geometric factors and
showed that the geometric factor of the component with low volume
fraction are more effective and the piezoelectric property of
composite materials depend more on the geometric factors for the
dielectric constant than on those of the elastic constant.
The theoretical predictions are generalized to study the
temperature dependence of the properties of the composite
materials.
New expressions for the piezoelectric constants of composite
materials are derived and used to study their volume fraction,
shape of inclusions and temperature dependence.
Finally, the theoretical predictions are tested with
experimental data on a variety of composite materials.
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Keywords
Ceramic-Polymer Composite Materials