The effect of titanium excess and deficiency on the microstructure and dielectric properties of lanthanum doped Ba0.55Sr0.45TiO3 with colossal permittivity |
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Author: | Nurmi, Kari1; Jantunen, Heli1; Juuti, Jari1 |
Organizations: |
1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014 Oulu, Finland |
Format: | article |
Version: | accepted version |
Access: | open |
Online Access: | PDF Full Text (PDF, 1.2 MB) |
Persistent link: | http://urn.fi/urn:nbn:fi-fe201901303572 |
Language: | English |
Published: |
Elsevier,
2019
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Publish Date: | 2020-12-19 |
Description: |
AbstractThe temperature dependent dielectric properties of (Ba0.54875Sr0.44875La0.0025)Ti(1+x)O3 with both an excess and a deficiency of 0.25 mol.% TiO2 were investigated. The samples were prepared by the mixed oxide method and sintered in a conventional oven at temperatures ranging from 1400 °C to 1475 °C. The cubic perovskite structure was confirmed with XRD at room temperature. The sample with an excess of 0.25 mol.% Ti exhibited reduced grain growth while abnormal grain growth was observed for samples without Ti modification. Samples exhibited colossal permittivity for all modified compositions. With a 0.25 mol.% deficiency of Ti a permittivity over 65,000 and a tan δ under 0.05 were measured over a temperature range of −68 °C to 150 °C and a frequency range between 50 kHz and 1 MHz. This paper shows that by fine tuning the composition, materials with new, exciting and widely adjustable dielectric properties can be achieved. see all
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Series: |
Journal of the European Ceramic Society |
ISSN: | 0955-2219 |
ISSN-E: | 1873-619X |
ISSN-L: | 0955-2219 |
Volume: | 39 |
Issue: | 4 |
Pages: | 1110 - 1115 |
DOI: | 10.1016/j.jeurceramsoc.2018.12.039 |
OADOI: | https://oadoi.org/10.1016/j.jeurceramsoc.2018.12.039 |
Type of Publication: |
A1 Journal article – refereed |
Field of Science: |
213 Electronic, automation and communications engineering, electronics |
Subjects: | |
Funding: |
Authors Jari Juuti and Kari Nurmi gratefully acknowledges funding of the LEAP project from the Academy of Finland (grant agreement Nos. 267573, 273663 and 304033). |
Academy of Finland Grant Number: |
267573 273663 304033 |
Detailed Information: |
267573 (Academy of Finland Funding decision) 273663 (Academy of Finland Funding decision) 304033 (Academy of Finland Funding decision) |
Copyright information: |
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
https://creativecommons.org/licenses/by-nc-nd/4.0/ |