Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications

B. R. Sudireddy*, P. Blennow, K. Agersted, K.V. Hansen, M. B. Mogensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nb-doped strontium titanate (Sr0.99Ti0.9Nb0.1O3, STN) tapes were fabricated by tape casting and used for investigating the influence of pre-treatment temperature on the sintering behavior, microstructure and electronic properties. The pre-treatment temperature was varied between 500 °C and 800 °C. Phase analysis of the powder from the pre-treatment step showed a single phase up to 700 °C and a Sr-enriched secondary phase beyond 700 °C. Sintering dilatometry showed similar sintering behaviour with little variation in the final shrinkage with different pre-treatment temperatures. Backscattered electron imaging confirmed the presence of Sr enriched secondary phase for pre-treatment at 700 °C or above. Conductance mapping on samples pre-treated at 800 °C and sintered at 1450 °C exhibited regions of low conductance. Conductivity measurements of pre-treated and sintered, at 1300 °C, samples showed decrease in conductivity within creasing pre-treatment temperature. These observations enhance the understanding of processing STN materials for solid oxide cells applications significantly.
Original languageEnglish
JournalSolid State Ionics
Volume335
Pages (from-to)164-169
ISSN0167-2738
DOIs
Publication statusPublished - 2019

Keywords

  • Solid oxide cells
  • Nb-doped strontium titanate
  • Sintering
  • Conductivity

Cite this

@article{9ace5d57007b48349d6d0ad2a25f9850,
title = "Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications",
abstract = "Nb-doped strontium titanate (Sr0.99Ti0.9Nb0.1O3, STN) tapes were fabricated by tape casting and used for investigating the influence of pre-treatment temperature on the sintering behavior, microstructure and electronic properties. The pre-treatment temperature was varied between 500 °C and 800 °C. Phase analysis of the powder from the pre-treatment step showed a single phase up to 700 °C and a Sr-enriched secondary phase beyond 700 °C. Sintering dilatometry showed similar sintering behaviour with little variation in the final shrinkage with different pre-treatment temperatures. Backscattered electron imaging confirmed the presence of Sr enriched secondary phase for pre-treatment at 700 °C or above. Conductance mapping on samples pre-treated at 800 °C and sintered at 1450 °C exhibited regions of low conductance. Conductivity measurements of pre-treated and sintered, at 1300 °C, samples showed decrease in conductivity within creasing pre-treatment temperature. These observations enhance the understanding of processing STN materials for solid oxide cells applications significantly.",
keywords = "Solid oxide cells, Nb-doped strontium titanate, Sintering, Conductivity",
author = "Sudireddy, {B. R.} and P. Blennow and K. Agersted and K.V. Hansen and Mogensen, {M. B.}",
year = "2019",
doi = "10.1016/j.ssi.2019.01.030",
language = "English",
volume = "335",
pages = "164--169",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications. / Sudireddy, B. R.; Blennow, P.; Agersted, K.; Hansen, K.V.; Mogensen, M. B.

In: Solid State Ionics, Vol. 335, 2019, p. 164-169.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications

AU - Sudireddy, B. R.

AU - Blennow, P.

AU - Agersted, K.

AU - Hansen, K.V.

AU - Mogensen, M. B.

PY - 2019

Y1 - 2019

N2 - Nb-doped strontium titanate (Sr0.99Ti0.9Nb0.1O3, STN) tapes were fabricated by tape casting and used for investigating the influence of pre-treatment temperature on the sintering behavior, microstructure and electronic properties. The pre-treatment temperature was varied between 500 °C and 800 °C. Phase analysis of the powder from the pre-treatment step showed a single phase up to 700 °C and a Sr-enriched secondary phase beyond 700 °C. Sintering dilatometry showed similar sintering behaviour with little variation in the final shrinkage with different pre-treatment temperatures. Backscattered electron imaging confirmed the presence of Sr enriched secondary phase for pre-treatment at 700 °C or above. Conductance mapping on samples pre-treated at 800 °C and sintered at 1450 °C exhibited regions of low conductance. Conductivity measurements of pre-treated and sintered, at 1300 °C, samples showed decrease in conductivity within creasing pre-treatment temperature. These observations enhance the understanding of processing STN materials for solid oxide cells applications significantly.

AB - Nb-doped strontium titanate (Sr0.99Ti0.9Nb0.1O3, STN) tapes were fabricated by tape casting and used for investigating the influence of pre-treatment temperature on the sintering behavior, microstructure and electronic properties. The pre-treatment temperature was varied between 500 °C and 800 °C. Phase analysis of the powder from the pre-treatment step showed a single phase up to 700 °C and a Sr-enriched secondary phase beyond 700 °C. Sintering dilatometry showed similar sintering behaviour with little variation in the final shrinkage with different pre-treatment temperatures. Backscattered electron imaging confirmed the presence of Sr enriched secondary phase for pre-treatment at 700 °C or above. Conductance mapping on samples pre-treated at 800 °C and sintered at 1450 °C exhibited regions of low conductance. Conductivity measurements of pre-treated and sintered, at 1300 °C, samples showed decrease in conductivity within creasing pre-treatment temperature. These observations enhance the understanding of processing STN materials for solid oxide cells applications significantly.

KW - Solid oxide cells

KW - Nb-doped strontium titanate

KW - Sintering

KW - Conductivity

U2 - 10.1016/j.ssi.2019.01.030

DO - 10.1016/j.ssi.2019.01.030

M3 - Journal article

VL - 335

SP - 164

EP - 169

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -