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Thermal Expansion And Related Studies In Cordierite Ceramics And Relaxor Ferroelectrics

Electronic Theses of Indian Institute of Science

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Title Thermal Expansion And Related Studies In Cordierite Ceramics And Relaxor Ferroelectrics
 
Creator Sai Sundar, V V S S
 
Subject Cordierite Ceramics - Thermal Expansion
Ferroelectrics - Thermal Expansion
Ceramics - Microcracking
Acoustic Emission
Relaxor Ferroelectrics
Cordierite Ceramics
Lead Iron Niobate
Bismuth Ferrite Ceramics
Lead Titanate Ceramics
Materials Science
 
Description The following investigations have been carried out in this thesis
1)Cordierite is already well known for its low thermal expansion behaviour. Chemical substitutions at various octahedral and tetrahedral sites have been done and their thermal expansion characteristics have been studied Synthesis of cordierite in more reactive environment provided by AlF3 used as sintering aid has been attempted
2) Diffuse ferroelectric phase transition of lead based perovskite materials leads to low expansion region. Solid solutions of lead iron niobate with lead titanate is investigated to increase the structural distortion and see it this low expansion region can be extended to wider temperature Preparation of materials with higher tetragonal distortion In PbTi03- BlFeO3 system is undertaken to study the thermal expansion anisotropy.
3) Composites between lead iron niobate(+(x) and lead titanate (-(x below Tc) has been undertaken to prepare low expansion hulk over a wide temperature range
4) Acoustic emission has been employed as a tool to detect the microcracking in solid solutions between PFN1-x, PTx, and PT1-x, ,BFx, It is hoped to understand relation between magnitude of lattice distortion transition temperature and microcracking in ceramics of the class of materials.
 
Contributor Umarji, A M
 
Date 2013-07-02T10:11:41Z
2013-07-02T10:11:41Z
2013-07-02
1995-09
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/handle/2005/2094
http://etd.ncsi.iisc.ernet.in/abstracts/2695/G14136-Abs.pdf
 
Language en_US
 
Relation G14136