Microstructure and thermoelectric properties of La0.1Dy0.1SrxTiO3 ceramics

Jiao Han; Qiu Sun; Wenxu Li; Ying Song

doi:10.1016/j.ceramint.2017.01.083

Microstructure and thermoelectric properties of La_0.1Dy_0.1Sr_xTiO₃ ceramics

Jiao Han
, Qiu Sun
, Wenxu Li
, Ying Song^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering, Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

La_0.1Dy_0.1Sr_xTiO₃ (x=0.80, 0.78, 0.75, 0.70) powders were synthesized via a sol-gel method, followed by sintering at 1550 °C in a reducing atmosphere of 5 vol% hydrogen in nitrogen. The microstructure and thermoelectric properties of the Sr-deficient La and Dy co-doped SrTiO₃ were investigated. The result of XRD revealed that La_0.1Dy_0.1Sr_xTiO₃ consisted of SrTiO₃ with a cubic crystal structure as the main phase and of a small amount of Dy₂Ti₂O₇ as the second phase. All the Sr-deficient samples exhibited a step-like microstructure. As the nominal Sr deficient content increased, the electrical conductivity of the Sr-deficient La_0.1Dy_0.1Sr_xTiO₃ ceramics enhanced due to the increasing Sr and oxygen vacancies, the absolute value of the Seebeck coefficient increased a little, and the thermal conductivity decreased to ~3.0 W m⁻¹ K⁻¹, leading to a high ZT value of 0.19 for La_0.1Dy_0.1Sr_0.75TiO₃ at 500 °C.

Original language	English
Pages (from-to)	5557-5563
Number of pages	7
Journal	Ceramics International
Volume	43
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2017.01.083
State	Published - 1 May 2017
Externally published	Yes

Keywords

Microstructure
Sr-deficiency
SrTiO
Thermoelectric properties

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10.1016/j.ceramint.2017.01.083

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@article{53f3b1d2e66d4b83bc501981610ecdd0,

title = "Microstructure and thermoelectric properties of La0.1Dy0.1SrxTiO3 ceramics",

abstract = "La0.1Dy0.1SrxTiO3 (x=0.80, 0.78, 0.75, 0.70) powders were synthesized via a sol-gel method, followed by sintering at 1550 °C in a reducing atmosphere of 5 vol\% hydrogen in nitrogen. The microstructure and thermoelectric properties of the Sr-deficient La and Dy co-doped SrTiO3 were investigated. The result of XRD revealed that La0.1Dy0.1SrxTiO3 consisted of SrTiO3 with a cubic crystal structure as the main phase and of a small amount of Dy2Ti2O7 as the second phase. All the Sr-deficient samples exhibited a step-like microstructure. As the nominal Sr deficient content increased, the electrical conductivity of the Sr-deficient La0.1Dy0.1SrxTiO3 ceramics enhanced due to the increasing Sr and oxygen vacancies, the absolute value of the Seebeck coefficient increased a little, and the thermal conductivity decreased to \textasciitilde{}3.0 W m−1 K−1, leading to a high ZT value of 0.19 for La0.1Dy0.1Sr0.75TiO3 at 500 °C.",

keywords = "Microstructure, Sr-deficiency, SrTiO, Thermoelectric properties",

author = "Jiao Han and Qiu Sun and Wenxu Li and Ying Song",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

year = "2017",

month = may,

day = "1",

doi = "10.1016/j.ceramint.2017.01.083",

language = "英语",

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TY - JOUR

T1 - Microstructure and thermoelectric properties of La0.1Dy0.1SrxTiO3 ceramics

AU - Han, Jiao

AU - Sun, Qiu

AU - Li, Wenxu

AU - Song, Ying

PY - 2017/5/1

Y1 - 2017/5/1

N2 - La0.1Dy0.1SrxTiO3 (x=0.80, 0.78, 0.75, 0.70) powders were synthesized via a sol-gel method, followed by sintering at 1550 °C in a reducing atmosphere of 5 vol% hydrogen in nitrogen. The microstructure and thermoelectric properties of the Sr-deficient La and Dy co-doped SrTiO3 were investigated. The result of XRD revealed that La0.1Dy0.1SrxTiO3 consisted of SrTiO3 with a cubic crystal structure as the main phase and of a small amount of Dy2Ti2O7 as the second phase. All the Sr-deficient samples exhibited a step-like microstructure. As the nominal Sr deficient content increased, the electrical conductivity of the Sr-deficient La0.1Dy0.1SrxTiO3 ceramics enhanced due to the increasing Sr and oxygen vacancies, the absolute value of the Seebeck coefficient increased a little, and the thermal conductivity decreased to ~3.0 W m−1 K−1, leading to a high ZT value of 0.19 for La0.1Dy0.1Sr0.75TiO3 at 500 °C.

AB - La0.1Dy0.1SrxTiO3 (x=0.80, 0.78, 0.75, 0.70) powders were synthesized via a sol-gel method, followed by sintering at 1550 °C in a reducing atmosphere of 5 vol% hydrogen in nitrogen. The microstructure and thermoelectric properties of the Sr-deficient La and Dy co-doped SrTiO3 were investigated. The result of XRD revealed that La0.1Dy0.1SrxTiO3 consisted of SrTiO3 with a cubic crystal structure as the main phase and of a small amount of Dy2Ti2O7 as the second phase. All the Sr-deficient samples exhibited a step-like microstructure. As the nominal Sr deficient content increased, the electrical conductivity of the Sr-deficient La0.1Dy0.1SrxTiO3 ceramics enhanced due to the increasing Sr and oxygen vacancies, the absolute value of the Seebeck coefficient increased a little, and the thermal conductivity decreased to ~3.0 W m−1 K−1, leading to a high ZT value of 0.19 for La0.1Dy0.1Sr0.75TiO3 at 500 °C.

KW - Microstructure

KW - Sr-deficiency

KW - SrTiO

KW - Thermoelectric properties

UR - https://www.scopus.com/pages/publications/85011117104

U2 - 10.1016/j.ceramint.2017.01.083

DO - 10.1016/j.ceramint.2017.01.083

M3 - 文章

AN - SCOPUS:85011117104

SN - 0272-8842

VL - 43

SP - 5557

EP - 5563

JO - Ceramics International

JF - Ceramics International

IS - 7

ER -

Microstructure and thermoelectric properties of La_0.1Dy_0.1Sr_xTiO₃ ceramics

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Keywords

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