Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

被引：9

作者：

Khaliq, Jibran ^{[1
]}

Li, Chunchun ^{[2
,3
]}

Chen, Kan ^{[1
]}

Shi, Baogui ^{[4
]}

Ye, Haitao ^{[4
]}

Grande, Antonio M. ^{[5
]}

Yan, Haixue ^{[1
,6
]}

Reece, Michael J. ^{[1
,6
]}

机构：

[1] Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England

[2] Xi An Jiao Tong Univ, Minist Educ, Elect Mat Res Lab, Key Lab, Xian 710049, Peoples R China

[3] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China

[4] Aston Univ, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England

[5] Delft Univ Technol, Fac Aerosp Engn, NL-2629 HS Delft, Netherlands

[6] Nanoforce Technol Ltd, London E1 4NS, England

来源：

JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 07期

关键词：

THERMOELECTRIC PROPERTIES; TITANIUM-OXIDE; CERAMICS; SR2NB2O7; SRTIO3; BI0.5SB1.5TE3; SUBSTITUTION; ENHANCEMENT; SURFACE; STATES;

D O I：

10.1063/1.4908209

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of substitution and oxidation-reduction on the thermal conductivity of perovskite-like layered structure (PLS) ceramics was investigated in relation to mass contrast and non-stoichiometry. Sr (acceptor) was substituted on the A site, while Ta (donor) was substituted on the B site of La2Ti2O7. Substitution in PLS materials creates atomic scale disorders to accommodate the non-stoichiometry. High resolution transmission electron microscopy and X ray diffraction revealed that acceptor substitution in La2Ti2O7 produced nanoscale intergrowths of n = 5 layered phase, while donor substitution produced nanoscale intergrowths of n = 3 layered phase. As a result of these nanoscale intergrowths, the thermal conductivity value reduced by as much as similar to 20%. Pure La2Ti2O7 has a thermal conductivity value of similar to 1.3W/m K which dropped to a value of similar to 1.12W/m K for Sr doped La2Ti2O7 and similar to 0.93 W/m K for Ta doped La2Ti2O7 at 573K. (C) 2015 AIP Publishing LLC.

引用

页数：7

共 45 条

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