High-Temperature Thermoelectric Properties of (1 − x) SrTiO3 − (x) La1/3NbO3 Ceramic Solid Solution

Deepanshu Srivastava, Feridoon Azough, M. Molinari, Stephen C. Parker, Robert Freer

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Ceramics based on SrTiO3 are of growing interest as thermoelectric materials because of their high-temperature stability and non-toxicity. Substitution of La and Nb into the perovskite structure provides opportunities to control both the microstructure and properties. Ceramic solid solutions of (1 − x) SrTiO3 − (x) La1/3NbO3 were prepared by the mixed oxide route, using compositional steps of x = 0.1. Pressed pellets were sintered at temperatures of 1573 K to 1723 K in air. Addition of aliovalent ions (La3+, Nb5+) on the A/B sites (Sr2+, Ti4+) led to A-Site cation deficiency in the stoichiometric compositions and other defect structures which increased carrier concentration. A maximum ZT of 0.004 was obtained for the x = 0.2 stoichiometric sample, although much higher ZT values are possible by sample reduction.

LanguageEnglish
Pages1803-1808
Number of pages6
JournalJournal of Electronic Materials
Volume44
Issue number6
Early online date18 Dec 2014
DOIs
Publication statusPublished - 1 Jun 2015
Externally publishedYes

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Solid solutions
solid solutions
ceramics
thermoelectric materials
Defect structures
mixed oxides
pellets
Perovskite
Oxides
Carrier concentration
Cations
Substitution reactions
Positive ions
routes
Ions
substitutes
cations
Temperature
microstructure
Microstructure

Cite this

Srivastava, Deepanshu ; Azough, Feridoon ; Molinari, M. ; Parker, Stephen C. ; Freer, Robert. / High-Temperature Thermoelectric Properties of (1 − x) SrTiO3 − (x) La1/3NbO3 Ceramic Solid Solution. In: Journal of Electronic Materials. 2015 ; Vol. 44, No. 6. pp. 1803-1808.
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High-Temperature Thermoelectric Properties of (1 − x) SrTiO3 − (x) La1/3NbO3 Ceramic Solid Solution. / Srivastava, Deepanshu; Azough, Feridoon; Molinari, M.; Parker, Stephen C.; Freer, Robert.

In: Journal of Electronic Materials, Vol. 44, No. 6, 01.06.2015, p. 1803-1808.

Research output: Contribution to journalArticle

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