| Autor: |
L.C. Wen, S.C. Chang, M.C. Lee, Y.H. Lee, H.Y. Hsieh, M.Y. Lin, L.Y. Jang, W.P. Su, Y.S. Lee, Hsien Chung Kao, H.S. Sheu |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Materials Research Bulletin. 50:297-302 |
| ISSN: |
0025-5408 |
| DOI: |
10.1016/j.materresbull.2013.10.050 |
| Popis: |
A series of (Gd2−xLix)Ti2O7−x with x = 0.040–0.110 was first reported. Parent compound with 2x moles of LiO0.5 self-flux was prepared at 1250 °C and abbreviated as GLT-2L. Relative density of all the samples is higher than 92%. By the addition of flux and Li ions substitution, preparation temperature is lowered for more than 300 °C. Comparing the unit cell a-axis, GLT with a formula as (Gd2−xLix)Ti2O7−x without flux addition has exactly the same as the GLT-2L with the same x. By the addition of flux, materials become more compact and grains grow bigger for the GLT-2L than the corresponding GLT samples. Electrical conductivity of a GLT-2L with x = 0.110 at 700 °C is 3 times larger than the measurements done by other research groups in the Gd2Ti2O7. In order to demonstrate the successful substitution of the Li ion into the Gd site, a series of GT samples was prepared with a formula of Gd2−xTi2O7−1.5x. With the same amount of x, every GLT samples have a longer unit cell a-axis than that of the GT. The difference is caused by the substitution of the Li ion into the Gd site. Valence of the Ti atoms of the GLT-2L samples is slightly less than 4 studied by the XANES spectroscopy. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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