Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials
Low thermal conductivity is one of the key requirements for thermal barrier coating materials. From the consideration of crystal structure and ion radius, La3+ Doped Yb2Sn2O7 ceramics with pyrochlore crystal structures were synthesised by sol-gel method as candidates of thermal barrier materials in...
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Elsevier
2015
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| Online Access: | https://eprints.nottingham.ac.uk/30188/ |
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| author | Wang, Jing Xu, Fang Wheatley, Richard J. Choy, Kwang-Leong Neate, Nigel C. Hou, Xianghui |
| author_facet | Wang, Jing Xu, Fang Wheatley, Richard J. Choy, Kwang-Leong Neate, Nigel C. Hou, Xianghui |
| author_sort | Wang, Jing |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Low thermal conductivity is one of the key requirements for thermal barrier coating materials. From the consideration of crystal structure and ion radius, La3+ Doped Yb2Sn2O7 ceramics with pyrochlore crystal structures were synthesised by sol-gel method as candidates of thermal barrier materials in aero-engines. As La3+ and Yb3+ ions have the largest radius difference in lanthanoids group, La3+ ions were expected to produce significant disorders by replacing Yb3+ ions in cation layers of Yb2Sn2O7. Both experimental and computational phase analysis were carried out, and good agreement had been obtained. The lattice constants of solid solution (LaxYb1-x)2Sn2O7 (x=0.3, 0.5, 0.7) increased linearly when the content of La3+ was increased. The thermal properties (thermal conductivity and coefficients of thermal expansion) of the synthesized materials had been compared with traditional 8 wt.% Yttria Stabilized Zirconia (8YSZ) and La2Zr2O7 (LZ). It was found that La3+ Doped Yb2Sn2O7 exhibited lower thermal conductivities than un-doped stannates. Amongst all compositions studied, (La0.5Yb0.5)2Sn2O7 exhibited the lowest thermal conductivity (0.851 W·m-1·K-1 at room temperature), which was much lower than that of 8YSZ (1.353 W·m-1·K-1), and possessed a high coefficient of thermal expansion (CTE), 13.530×10-6 K-1 at 950oC. |
| first_indexed | 2025-11-14T19:08:15Z |
| format | Article |
| id | nottingham-30188 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:08:15Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-301882020-05-04T17:23:17Z https://eprints.nottingham.ac.uk/30188/ Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials Wang, Jing Xu, Fang Wheatley, Richard J. Choy, Kwang-Leong Neate, Nigel C. Hou, Xianghui Low thermal conductivity is one of the key requirements for thermal barrier coating materials. From the consideration of crystal structure and ion radius, La3+ Doped Yb2Sn2O7 ceramics with pyrochlore crystal structures were synthesised by sol-gel method as candidates of thermal barrier materials in aero-engines. As La3+ and Yb3+ ions have the largest radius difference in lanthanoids group, La3+ ions were expected to produce significant disorders by replacing Yb3+ ions in cation layers of Yb2Sn2O7. Both experimental and computational phase analysis were carried out, and good agreement had been obtained. The lattice constants of solid solution (LaxYb1-x)2Sn2O7 (x=0.3, 0.5, 0.7) increased linearly when the content of La3+ was increased. The thermal properties (thermal conductivity and coefficients of thermal expansion) of the synthesized materials had been compared with traditional 8 wt.% Yttria Stabilized Zirconia (8YSZ) and La2Zr2O7 (LZ). It was found that La3+ Doped Yb2Sn2O7 exhibited lower thermal conductivities than un-doped stannates. Amongst all compositions studied, (La0.5Yb0.5)2Sn2O7 exhibited the lowest thermal conductivity (0.851 W·m-1·K-1 at room temperature), which was much lower than that of 8YSZ (1.353 W·m-1·K-1), and possessed a high coefficient of thermal expansion (CTE), 13.530×10-6 K-1 at 950oC. Elsevier 2015-11-15 Article PeerReviewed Wang, Jing, Xu, Fang, Wheatley, Richard J., Choy, Kwang-Leong, Neate, Nigel C. and Hou, Xianghui (2015) Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials. Materials & Design, 85 . pp. 423-430. ISSN 0261-3069 thermal conductivity thermal barrier materials http://www.sciencedirect.com/science/article/pii/S0264127515300988 doi:10.1016/j.matdes.2015.07.022 doi:10.1016/j.matdes.2015.07.022 |
| spellingShingle | thermal conductivity thermal barrier materials Wang, Jing Xu, Fang Wheatley, Richard J. Choy, Kwang-Leong Neate, Nigel C. Hou, Xianghui Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title | Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title_full | Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title_fullStr | Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title_full_unstemmed | Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title_short | Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials |
| title_sort | investigation of la3+ doped yb2sn2o7 as new thermal barrier materials |
| topic | thermal conductivity thermal barrier materials |
| url | https://eprints.nottingham.ac.uk/30188/ https://eprints.nottingham.ac.uk/30188/ https://eprints.nottingham.ac.uk/30188/ |