University of Oulu

Kari Nurmi, Heli Jantunen, Jari Juuti, The effect of titanium excess and deficiency on the microstructure and dielectric properties of lanthanum doped Ba0.55Sr0.45TiO3 with colossal permittivity, Journal of the European Ceramic Society, Volume 39, Issue 4, 2019, Pages 1110-1115, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2018.12.039

The effect of titanium excess and deficiency on the microstructure and dielectric properties of lanthanum doped Ba0.55Sr0.45TiO3 with colossal permittivity

Saved in:
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: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201901303572
Language: English
Published: Elsevier, 2019
Publish Date: 2020-12-19
Description:

Abstract

The 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

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:
BST
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/