Effect of reducing annealing on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics

Chunlin Gong; Gaogao Dong; Jiaxin Hu; Yongsheng Chen; Mengjie Qin; Shengjie Yang; Feng Gao

doi:10.1007/s10854-017-7361-0

Effect of reducing annealing on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO₃ ceramics

Chunlin Gong, Gaogao Dong, Jiaxin Hu, Yongsheng Chen, Mengjie Qin, Shengjie Yang, Feng Gao

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

21 Scopus citations

Abstract

Sr_1−xLa_xTiO₃ (SLTB) ceramics were fabricated by conventional solid state reaction method. SLTB ceramics were sintered in air, argon and nitrogen atmospheres and then annealed in argon and graphite (Ar + C) atmosphere. The effect of reducing annealing atmosphere on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO₃ ceramics was investigated. The results showed that the S_0.9L_0.1TB ceramics sintered in argon have the lowest resistivity (5.6 × 10⁴ Ω cm). And the resistivity of S_0.9L_0.1TB ceramics annealed in Ar + C environment at 1450 °C for 16 h decreased significantly (6–7 orders of magnitude). The Seebeck coefficient is negative with the increasing absolute value at elevated temperature. The thermal conductivity decreased with the temperature increased. The power factor and electrical conductivity increase first and then decrease with increasing temperatures. S_0.9L_0.1TB ceramics have a maximum value of Seebeck coefficient (−255 μV/K) at 1073 K and the figure of merit ZT_1073K = 0.269.

Original language	English
Pages (from-to)	14893-14900
Number of pages	8
Journal	Journal of Materials Science: Materials in Electronics
Volume	28
Issue number	19
DOIs	https://doi.org/10.1007/s10854-017-7361-0
State	Published - 1 Oct 2017

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title = "Effect of reducing annealing on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics",

abstract = "Sr1−xLaxTiO3 (SLTB) ceramics were fabricated by conventional solid state reaction method. SLTB ceramics were sintered in air, argon and nitrogen atmospheres and then annealed in argon and graphite (Ar + C) atmosphere. The effect of reducing annealing atmosphere on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics was investigated. The results showed that the S0.9L0.1TB ceramics sintered in argon have the lowest resistivity (5.6 × 104 Ω cm). And the resistivity of S0.9L0.1TB ceramics annealed in Ar + C environment at 1450 °C for 16 h decreased significantly (6–7 orders of magnitude). The Seebeck coefficient is negative with the increasing absolute value at elevated temperature. The thermal conductivity decreased with the temperature increased. The power factor and electrical conductivity increase first and then decrease with increasing temperatures. S0.9L0.1TB ceramics have a maximum value of Seebeck coefficient (−255 μV/K) at 1073 K and the figure of merit ZT1073K = 0.269.",

author = "Chunlin Gong and Gaogao Dong and Jiaxin Hu and Yongsheng Chen and Mengjie Qin and Shengjie Yang and Feng Gao",

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doi = "10.1007/s10854-017-7361-0",

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TY - JOUR

T1 - Effect of reducing annealing on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics

AU - Gong, Chunlin

AU - Dong, Gaogao

AU - Hu, Jiaxin

AU - Chen, Yongsheng

AU - Qin, Mengjie

AU - Yang, Shengjie

AU - Gao, Feng

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Sr1−xLaxTiO3 (SLTB) ceramics were fabricated by conventional solid state reaction method. SLTB ceramics were sintered in air, argon and nitrogen atmospheres and then annealed in argon and graphite (Ar + C) atmosphere. The effect of reducing annealing atmosphere on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics was investigated. The results showed that the S0.9L0.1TB ceramics sintered in argon have the lowest resistivity (5.6 × 104 Ω cm). And the resistivity of S0.9L0.1TB ceramics annealed in Ar + C environment at 1450 °C for 16 h decreased significantly (6–7 orders of magnitude). The Seebeck coefficient is negative with the increasing absolute value at elevated temperature. The thermal conductivity decreased with the temperature increased. The power factor and electrical conductivity increase first and then decrease with increasing temperatures. S0.9L0.1TB ceramics have a maximum value of Seebeck coefficient (−255 μV/K) at 1073 K and the figure of merit ZT1073K = 0.269.

AB - Sr1−xLaxTiO3 (SLTB) ceramics were fabricated by conventional solid state reaction method. SLTB ceramics were sintered in air, argon and nitrogen atmospheres and then annealed in argon and graphite (Ar + C) atmosphere. The effect of reducing annealing atmosphere on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO3 ceramics was investigated. The results showed that the S0.9L0.1TB ceramics sintered in argon have the lowest resistivity (5.6 × 104 Ω cm). And the resistivity of S0.9L0.1TB ceramics annealed in Ar + C environment at 1450 °C for 16 h decreased significantly (6–7 orders of magnitude). The Seebeck coefficient is negative with the increasing absolute value at elevated temperature. The thermal conductivity decreased with the temperature increased. The power factor and electrical conductivity increase first and then decrease with increasing temperatures. S0.9L0.1TB ceramics have a maximum value of Seebeck coefficient (−255 μV/K) at 1073 K and the figure of merit ZT1073K = 0.269.

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SN - 0957-4522

VL - 28

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EP - 14900

JO - Journal of Materials Science: Materials in Electronics

JF - Journal of Materials Science: Materials in Electronics

IS - 19

ER -

Effect of reducing annealing on the microstructure and thermoelectric properties of La–Bi co-doped SrTiO₃ ceramics

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