Sintering temperature effect

1. Effect of sintering temperature on structural and dielectric
properties of Ba0.7Ca0.3TiO3 ceramic sintered by microwave
technique
Mr. Sagar M. Mane1,2
Dr. Chandrakant B. Kolekar2 & Dr. Shrinivas B. Kulkarni1
1Department of Physics, The Institute of Science, Mumbai-400032
2Department Of Physics, S.M.S.M.P Mahavidyalaya Natepute, Solapur-413109
Email:-sbk_physics@yahoo.com;manesagar99@gmail.com
By

2. Selection of Ba0.7Ca0.3TiO3 (BCT)
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 Materials from BaTiO3 family are most interesting materials and
known for exhibiting high dielectric constant, ferroelectric
pyroelectric and piezoelectric behavior.
 It is possible to dope BaTiO3 with various materials as like Ca, Sr or
Zr, doping improves the electrical properties of this electroceramics.
 BaCaTiO3 is a solid solution of BaTiO3 and CaTiO3 and founds
useful in the applications such as filters, antennas, phase shifters,
resonators or as a ceramic capacitors.
 Ca doped BaTiO3 materials relatively shows high curie temperature
(ferroelectric-paraelectric phase transition) this feature attributes
for use of this material in numerous applications.
 Most useful feature of Ba0.7Ca0.3TiO3Microwave is that it can be used
in the formation of lead free BCT-BZT solid solution with
BaZr0.2Ti0.8O3 sintering this solid solution has properties
comparable with lead materials like PZT.

3. Why Microwave Sintering?
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1. Generally processing of ceramic materials were done at higher
temperatures (above 1000°C).
2. Microwave sintering technique provides internal heating from
material to surface rather than from surface to material in
conventional sintering.
3. Here heat is absorbed by suseceptor material inside rather than
heat radiation.
4. Very fast sintering of ceramics can easily possible with temperature
rate ~ 60°C and can be varied according to material under
process.
5. Microwave sintering technique founds the most useful technique
over the conventional sintering with its unique microstructure with
more densification of ceramic materials which improves other
electrical properties.
6. Reduced sintering temperature range and takes a very short time
to complete the mechanism which is useful in energy saving.
7. Eco-friendly process as the heat loss is very low as compared to

4. 4
Experimental

5. 5
Results And Discussion
Structural Analysis

6. 6
SEM and EDAX Analysis

7. 7
Temperature Dependent Dielectric Properties

8. 8
Ferroelectric Properties

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Conclusion….
 Microwave sintering is an very important and useful technique
for sintering of ceramics.
 Rapid heating improves the growth of grains in uniform
manner with high density and ultimately it affects on electrical
and physical properties of material.
 Structural analysis of BCT processed with microwave method
confirms the existence of tetragonal and orthorhombic crystal
structures.
 EDAX confirms presence of all the elements.
 The Tc of BCT ceramic material processed with microwave
sintering technique enhanced than the reported earlier.
 High dielectric constant with low dielectric loss shows BCT
ceramic material suits for many electrical application purpose.
 Polarization vs applied field loop confirms the ferroelectric
nature of the ceramic material.

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Thank You…..
ACKNOWLEDGEMENT
Authors are thankful to University Grants Commission
for funding through the project no F. No. 41-952/2012
(SR).