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Title: Microstructure evolution and electrical characterization of Lanthanum doped Barium Titanate (BaTiO{sub 3}) ceramics

Abstract

In the current work, we investigated the structural and dielectric properties of Lanthanum oxide (La{sub 2}O{sub 3}) doped Barium Titanate (BaTiO{sub 3}) ceramics and established a correlation between them. Solid state sintering method was used to dope BaTiO{sub 3} with 0.3, 0.5 and 0.7 mole% La{sub 2}O{sub 3} under different sintering parameters. The raw materials used were La{sub 2}O{sub 3} nano powder of ~80 nm grain size and 99.995% purity and BaTiO{sub 3} nano powder of 100 nm grain size and 99.99% purity. Grain size distribution and morphology of fracture surface of sintered pellets were examined by Field Emission Scanning Electron Microscope and X-Ray Diffraction analysis was conducted to confirm the formation of desired crystal structure. The research result reveal that grain size and electrical properties of BaTiO{sub 3} ceramic significantly enhanced for small amount of doping (up to 0.5 mole% La{sub 2}O{sub 3}) and then decreased with increasing doping concentration. Desired grain growth (0.80-1.3 µm) and high densification (<90% theoretical density) were found by proper combination of temperature, sintering parameters and doping concentration. We found the resultant stable value of dielectric constant was 10000-12000 at 100-300 Hz in the temperature range of 30°-50° C for 0.5 mole% La{sub 2}O{submore » 3} with corresponding shift of curie temperature around 30° C. So overall this research showed that proper La{sup 3+} concentration can control the grain size, increase density, lower curie temperature and hence significantly improve the electrical properties of BaTiO{sub 3} ceramics.« less

Authors:
; ;  [1];  [2];  [3];  [4]
  1. Department of Materials & Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000 (Bangladesh)
  2. Department of Glass and Ceramic Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000 (Bangladesh)
  3. Bangladesh Council of Scientific & Industrial Research (BCSIR), Dhaka-1205 (Bangladesh)
  4. Institute of Fuel Research & Development, Bangladesh Council of Scientific & Industrial Research (BCSIR), Dhaka-1205 (Bangladesh)
Publication Date:
OSTI Identifier:
22608542
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1754; Journal Issue: 1; Conference: ICME 2015: 11. international conference on mechanical engineering, Dhaka (Bangladesh), 18-20 Dec 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; CERAMICS; CONCENTRATION RATIO; CRYSTAL STRUCTURE; CRYSTALS; CURIE POINT; DISTRIBUTION; DOPED MATERIALS; FIELD EMISSION; GRAIN GROWTH; GRAIN SIZE; LANTHANUM ADDITIONS; LANTHANUM OXIDES; PERMITTIVITY; SCANNING ELECTRON MICROSCOPY; SOLIDS; SURFACES; TITANATES; X-RAY DIFFRACTION

Citation Formats

Billah, Masum, E-mail: masum.buet09@gmail.com, Ahmed, A., E-mail: jhinukbuetmme@gmail.com, Rahman, Md. Miftaur, E-mail: miftaurrahman@mme.buet.ac.bd, Mahbub, Rubbayat, E-mail: rubayyatm@gce.buet.ac.bd, Gafur, M. A., E-mail: d-r-magafur@bcsir.gov.bd, and Bashar, M. Shahriar, E-mail: bashar@agni.com. Microstructure evolution and electrical characterization of Lanthanum doped Barium Titanate (BaTiO{sub 3}) ceramics. United States: N. p., 2016. Web. doi:10.1063/1.4958350.
Billah, Masum, E-mail: masum.buet09@gmail.com, Ahmed, A., E-mail: jhinukbuetmme@gmail.com, Rahman, Md. Miftaur, E-mail: miftaurrahman@mme.buet.ac.bd, Mahbub, Rubbayat, E-mail: rubayyatm@gce.buet.ac.bd, Gafur, M. A., E-mail: d-r-magafur@bcsir.gov.bd, & Bashar, M. Shahriar, E-mail: bashar@agni.com. Microstructure evolution and electrical characterization of Lanthanum doped Barium Titanate (BaTiO{sub 3}) ceramics. United States. doi:10.1063/1.4958350.
Billah, Masum, E-mail: masum.buet09@gmail.com, Ahmed, A., E-mail: jhinukbuetmme@gmail.com, Rahman, Md. Miftaur, E-mail: miftaurrahman@mme.buet.ac.bd, Mahbub, Rubbayat, E-mail: rubayyatm@gce.buet.ac.bd, Gafur, M. A., E-mail: d-r-magafur@bcsir.gov.bd, and Bashar, M. Shahriar, E-mail: bashar@agni.com. Tue . "Microstructure evolution and electrical characterization of Lanthanum doped Barium Titanate (BaTiO{sub 3}) ceramics". United States. doi:10.1063/1.4958350.
@article{osti_22608542,
title = {Microstructure evolution and electrical characterization of Lanthanum doped Barium Titanate (BaTiO{sub 3}) ceramics},
author = {Billah, Masum, E-mail: masum.buet09@gmail.com and Ahmed, A., E-mail: jhinukbuetmme@gmail.com and Rahman, Md. Miftaur, E-mail: miftaurrahman@mme.buet.ac.bd and Mahbub, Rubbayat, E-mail: rubayyatm@gce.buet.ac.bd and Gafur, M. A., E-mail: d-r-magafur@bcsir.gov.bd and Bashar, M. Shahriar, E-mail: bashar@agni.com},
abstractNote = {In the current work, we investigated the structural and dielectric properties of Lanthanum oxide (La{sub 2}O{sub 3}) doped Barium Titanate (BaTiO{sub 3}) ceramics and established a correlation between them. Solid state sintering method was used to dope BaTiO{sub 3} with 0.3, 0.5 and 0.7 mole% La{sub 2}O{sub 3} under different sintering parameters. The raw materials used were La{sub 2}O{sub 3} nano powder of ~80 nm grain size and 99.995% purity and BaTiO{sub 3} nano powder of 100 nm grain size and 99.99% purity. Grain size distribution and morphology of fracture surface of sintered pellets were examined by Field Emission Scanning Electron Microscope and X-Ray Diffraction analysis was conducted to confirm the formation of desired crystal structure. The research result reveal that grain size and electrical properties of BaTiO{sub 3} ceramic significantly enhanced for small amount of doping (up to 0.5 mole% La{sub 2}O{sub 3}) and then decreased with increasing doping concentration. Desired grain growth (0.80-1.3 µm) and high densification (<90% theoretical density) were found by proper combination of temperature, sintering parameters and doping concentration. We found the resultant stable value of dielectric constant was 10000-12000 at 100-300 Hz in the temperature range of 30°-50° C for 0.5 mole% La{sub 2}O{sub 3} with corresponding shift of curie temperature around 30° C. So overall this research showed that proper La{sup 3+} concentration can control the grain size, increase density, lower curie temperature and hence significantly improve the electrical properties of BaTiO{sub 3} ceramics.},
doi = {10.1063/1.4958350},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1754,
place = {United States},
year = {Tue Jul 12 00:00:00 EDT 2016},
month = {Tue Jul 12 00:00:00 EDT 2016}
}