Synthesis and characterization of polymer composite ferroelectric materials

Mohapatra, Anil (2011) Synthesis and characterization of polymer composite ferroelectric materials. MSc thesis.



Polymer-ceramic composites combine superior properties of both polymer and ceramics which result in far better performance than those of the constituent materials. Polymers are flexible, easy to fabricate and superior in dielectric break down strength. On the other hand, ferroelectric ceramics possess high dielectric permittivity but with poor mechanical properties and lower dielectric breakdown strength. By integrating high dielectric permittivity ceramic powder with superior dielectric strength of the polymer, one can develop a composite with high dielectric permittivity and high breakdown strength. This type of composites has high capability of energy storage and can be used in capacitors and energy storage device.
The Ba1-xSrxZr0.1T0.9O3 Powders were prepared by conventional solid-state reaction route, Ba replaced by Sr in A site of BaZr0.1Ti0.9O3 ceramic in different value of x(i.e x=0.0,0.1,0.2,0.3). Preliminary X-ray Structural analysis for Ba1-xSrxZr0.1T0.9O3 powders suggested the formation of single-phase compound in tetragonal crystal system. Then the polymer composite ferroelectric material is prepared by using polyvinyl alcohol (PVA) as a polymer matrix.
The polymer composite XRD pattern as same as ferroelectric ceramic patterns, it may be the ceramic powder dominating over the polymer. This may be due to the increase of amorphous nature of PVA with the addition of ferroelectric ceramic. The SEM micrograph shows that the BSZT particle distribution is homogenous with no porous in the PVA matrix. Detailed studies of dielectric and impedance properties of the material in a wide range of frequency (100Hz-1MHz) and temperatures (30-1200C) shows that these properties are strongly temperature and frequency dependent

Item Type:Thesis ( MSc)
Uncontrolled Keywords:polymer composite,dielectric,
Subjects:Physics > Condensed Matter
Divisions: Sciences > Department of Physics
ID Code:2425
Deposited By:mohapatra anil
Deposited On:16 May 2011 09:09
Last Modified:16 May 2011 10:01
Supervisor(s):Panigrahi, S

Repository Staff Only: item control page