Aliovalent doping of La2Zr2O7 with Al³ ⁺ and Ta⁵⁺ for CTE tuning; Journal of the European Ceramic Society; Vol. 46, iss. 9
| Parent link: | Journal of the European Ceramic Society.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 46, iss. 9.— 2026.— Article number 118224, 10 p. |
|---|---|
| Other Authors: | , , , , , |
| Summary: | Title screen In this work, the influence of aliovalent doping with Al3 + and Ta5+ cations on the structure and thermal properties of La2Zr2O7 (LZO) was investigated and the solubility of Al3+ and Ta5+ in LZO separately and jointly was studied for the first time. The samples were synthesized by mechanochemical activation followed by sintering at 1200 °C and 1500 °C. It was established that doping maintains the pyrochlore-type structure (space group Fd m) within observed solubility limits (Al3+ up to x ≈ 0.12 and Ta5+ up to y ≈ 0.48). While the CTE of pure LZO increases with temperature (from 7.97 at 25°C to 11.50 ×10⁻⁶ °C⁻¹ at 1300°C), co-doping with Al3+ and Ta5+, specifically for the La1.96Al0.09Ta0.25Zr1.7O7.075 composition, resulted in a remarkably stable CTE (from 9.09 at 25°C to 9.82 ×10⁻⁶ °C⁻¹ at 1300°C) over a wide temperature range, a critical factor for thermal barrier coatings Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.jeurceramsoc.2026.118215 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=686254 |
| Summary: | Title screen In this work, the influence of aliovalent doping with Al3 + and Ta5+ cations on the structure and thermal properties of La2Zr2O7 (LZO) was investigated and the solubility of Al3+ and Ta5+ in LZO separately and jointly was studied for the first time. The samples were synthesized by mechanochemical activation followed by sintering at 1200 °C and 1500 °C. It was established that doping maintains the pyrochlore-type structure (space group Fd m) within observed solubility limits (Al3+ up to x ≈ 0.12 and Ta5+ up to y ≈ 0.48). While the CTE of pure LZO increases with temperature (from 7.97 at 25°C to 11.50 ×10⁻⁶ °C⁻¹ at 1300°C), co-doping with Al3+ and Ta5+, specifically for the La1.96Al0.09Ta0.25Zr1.7O7.075 composition, resulted in a remarkably stable CTE (from 9.09 at 25°C to 9.82 ×10⁻⁶ °C⁻¹ at 1300°C) over a wide temperature range, a critical factor for thermal barrier coatings Текстовый файл AM_Agreement |
|---|---|
| DOI: | 10.1016/j.jeurceramsoc.2026.118215 |