University of Limerick Institutional Repository

Microstructural characterization and spark plasma sintering of BaTiOɜ based thermistors

DSpace Repository

Show simple item record

dc.contributor.advisor Tofail, Syed A.M. Karimi-Jafari, Maryam 2016-09-14T15:20:05Z 2016-09-14T15:20:05Z 2016
dc.description peer-reviewed en_US
dc.description.abstract Barium titanate is one of the most important and widely studied ferroelectric ceramics with ABO3 type perovskite structure. Due to its promising ferroelectric properties, it has been used in several applications such as positive temperature coefficient resistors (PTCR) called thermistor, sensors, electro-optical devices, multi-layer ceramic capacitors (MLCCs), electroluminescent panels, etc. Barium titanate shows a significant phase transition below and above Curie temperature (120 °C for pure barium titanate) from tetragonal to the cubic crystal structure. This phase transition however is strongly dependent on the microstructural properties such as density, grain size distribution, type of dopants and sintering conditions. In this research, extensive characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, electron backscattered diffraction (EBSD), and energy dispersive X-ray spectroscopy (EDX) were used to study the microstructural and compositional characteristics of 8 industrial samples. We have employed state of the art spark plasma sintering that offer rapid consolidation of powders, enabling significantly improved or even completely novel materials on barium titanate samples containing Ca, Sr and Pb as a dopant. The effect of various sintering parameters e.g. sintering temperature, soaking time and heating rate on microstructural and phase composition of the sintered samples were investigated and compared to the benchmark industrial sample. en_US
dc.language.iso eng en_US
dc.publisher University of Limerick en_US
dc.subject ceramics en_US
dc.subject barium titanate en_US
dc.subject ferroelectricity en_US
dc.title Microstructural characterization and spark plasma sintering of BaTiOɜ based thermistors en_US
dc.type info:eu-repo/semantics/masterThesis en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.type.supercollection ul_theses_dissertations en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ULIR


My Account