Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 2, Pages 1334-1342Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.09.096
Keywords
Pr3+ doping; La2Ti2O7 ceramics; Electrical properties
Categories
Funding
- National Natural Science Foundation of China [51332003]
- Sichuan Science and Technology Program [2018G20140]
- Fundamental Research Funds for Central Universities
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The electrical properties of La2Ti2O7 (LTO) ceramics have been enhanced through the substitution of La3+ ions by Pr3+ ions. Almost all doped Pr3+ ions will get at A - site without causing a change on monoclinic phase of LTO. The average grain size is 17.8 mu m for La1.9Pr0.1Ti2O7 ceramics. The relaxation activation energy which is contributed by defect dipoles that are formed from TiO6 oxygen octahedrons' distortions in grains is 1.6 eV for La1.9Pr0.1Ti2O7 ceramics. This kind of defects will be activated from 520 degrees C and completely be activated until 650 degrees C. The piezoelectric coefficient d(33) = 3.0 pC/N of La2-xPrxTi2O7 ceramics maintains stable when the Pr3+ doping content x ranging from 0.1 to 0.3.
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