June 9, 2021 Thesis Open Access

Dereje Biyena

Dublin Core Export

<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Dereje Biyena</dc:creator>
  <dc:date>2021-06-09</dc:date>
  <dc:description>Advisor: Dr. Kebede Legesse Kebeta

ABSTRACT

The semiconductor industry is one of the most developed and expanding branches in the world. Crystals of the perovskitefamily, such as PbTiO3, BaTiO3, SrTiO3 and, have been of constant interest because some of these materials show ferroelectric behavior and undergo structural phase transitions [ZVEI, March 2005]. PbTiO3 has been considered to be one of the most important members of this family. The objective of this study was Structural and complex impedance property study of lead titanate (PT) ceramic material. Single-phase polycrystalline samples of lead titanate with perovskite structure have been synthesized using solid-state reaction technique. Lead titanate thin films were also prepared by the sol synthesis from acetylacetone/ethylene glycol route by a sol–gel method. The thin films were deposited by a spin coating technique by utilizing the as-prepared PT-sol (precoating 1,000 rpm for 10 s. followed by 4,000 rpm for 30s.) The influence of film thickness, pyrolysis temperature, and heating rate on (the formation of thin films) microstructure and morphology of thin films have been systematically investigated. The processing parameters have been optimized to obtain phase pure, dense, crack-free, and homogeneous samples. The sintering behavior of PT-powders has been investigated using X-ray diffraction patterns. The X-ray powder diffraction data have been analyzed to confirm the phase formation and phase purity, to obtain unit cell parameters and unit cell volume. The porosity of the samples has been obtained through X-ray density and bulk density. The average particle sizes of the phase pure samples were obtained from the X-ray peak width using Scherrer’s formula. The influence of sintering temperature and time on the microstructure of samples has also been studied by carrying out SEM investigations. The notable feature of this microstructure study shows that the samples sintered at 900∘C for 12 hours possess a fairly uniform grain distribution. The electrical behavior (complex impedance Z∗, complex permittivity ∗, etc.) of the samples sintered at 900∘C for 12 hours has been studied by complex impedance spectroscopy. The temperature variation of real permittivity gives evidence of the ferroelectric phase transition as well as of the relaxation behavior.

Keywords: PT; X-ray; SEM; short circuit current; </dc:description>
  <dc:identifier>https://zenodo.org/record/14345</dc:identifier>
  <dc:identifier>10.20372/nadre:14345</dc:identifier>
  <dc:identifier>oai:zenodo.org:14345</dc:identifier>
  <dc:relation>doi:10.20372/nadre:14344</dc:relation>
  <dc:relation>url:https://nadre.ethernet.edu.et/communities/20-25</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/odc-by</dc:rights>
  <dc:title>Structural and complex impedance property study of lead titanate (PT)  ceramic material: A research Review</dc:title>
  <dc:type>info:eu-repo/semantics/doctoralThesis</dc:type>
  <dc:type>publication-thesis</dc:type>
</oai_dc:dc>