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Extrinsic contributions to the dielectric response in sintered BaTiO 3 nanostructures in paraelectric and ferroelectric regimes
- Source :
- Physica B: Condensed Matter. 525:70-77
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Post sintering studies of BaTiO 3 (BTO) nanoparticles are presented in detail. Bulk nanostructures were prepared via three different compaction processes, namely, uniaxial cold pressing (UCP), Cold Isostatic Pressing (CIP) and Spark Plasma Sintering (SPS). Effect of compaction technique on microstructures have been investigated and correlated with electrical response for each sample. In addition to the transport properties, temperature and frequency dependent dielectric response of variously sintered samples and bulk counterpart was recorded. Several aspects have been identified that are essential to be taken into account in order to completely understand physical processes. Drastically distinct features were observed in paraelectric (PE) regime well above ferroelectric (FE)-PE transition temperature. These features include intra grain conduction with a reduction in the magnitude of PE to FE peak dielectric constant magnitude. Role of strain, grain boundary conduction associated with observation of Maxwell Wagner relaxation and hopping conduction in dielectric and ferroelectric response have been observed and discussed. Densification with presence of oxygen vacancies, significantly enhances conductivity associated with the hopping of the carriers, in turn deteriorated ferroelectric response.
- Subjects :
- 010302 applied physics
Materials science
Condensed matter physics
Transition temperature
Sintering
Spark plasma sintering
02 engineering and technology
Dielectric
Conductivity
021001 nanoscience & nanotechnology
Condensed Matter Physics
Thermal conduction
01 natural sciences
Ferroelectricity
Electronic, Optical and Magnetic Materials
0103 physical sciences
Grain boundary
Electrical and Electronic Engineering
0210 nano-technology
Subjects
Details
- ISSN :
- 09214526
- Volume :
- 525
- Database :
- OpenAIRE
- Journal :
- Physica B: Condensed Matter
- Accession number :
- edsair.doi...........3adefd6d83f841f17384f8e78ff8fe64