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| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
MAT.P-555 |
| Subject |
Study on synthesis, crystal structure, oxygen ionic conductivity of Langasite based new compounds |
| Authors |
BONGSOO SON, Ha Eun Lee, JINHO SHIN, Seung-Joo Kim*
Department of Energy System, Ajou University, Korea
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| Abstract |
A langasite-type La3Ga5GeO14 has been studied primarily as a piezoelectric material. The crystal structure of La3Ga5GeO14 is very similar with the melilite, La1+xSr1-xGa3O7+x/2, which has been known to show high oxygen ion conductor. In the melilite structure, lanthanum was equivalently substituted with strontium to add oxygen in the interstitial site, leading to the high oxygen ion conductivity. In this study, we synthesized La3Ga5+xGe1-xO14+x/2 (x = 0 ~ 0.5) by solid state reaction to introduce interstitial oxygen in the lattice. The crystal structure of La3Ga5+xGe1-xO14+x/2 (x = 0 ~ 0.5) was characterized by powder X-ray diffraction. The La3Ga5+xGe1-xO14+x/2 (x = 0 ~ 0.5) crystallize hexagonal symmetry with space group P321. The position of interstitial oxygen was confirmed by Maximum Entropy Method (MEM). The oxygen ion conductivity was measured up to 900℃(± 5), the highest ion conductivity was 2.13×10-3S/cm(x = 0.4) and the activation energy was 1.12 eV (x = 0.4).
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| E-mail |
haeunney@ajou.ac.kr |
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121st General Meeting of the KCS