Presentation Information
[R2-13]Crystal chemistry of loparite (Na, REE, Ca)(Ti, Nb)O3: on the average and local structures<font color="#FF7F27">「発表賞エントリー」</font>
*Ginga Kitahara1, Akira Yoshiasa1, Tsubasa Tobase2, Makoto Tokuda3, Kazumasa Sugiyama3 (1. Kumamoto Univ., 2. HPSTAR, 3. Tohoku Univ.)
Keywords:
loparite,XAFS,single crystal X-ray diffraction,local structure,average structure
Loparite has a perovskite-type structure ABX3. To understand the detailed structure of loparite, we performed local structure analysis of trace elements by XAFS experiments and average structure analysis by single crystal X-ray diffraction.
We used loparite crystal: (Na0.57, REE0.31, Ca0.07)(Ti0.75, Nb0.25)O3 from Russia. We could refine the structure to R-3c and I4/mcm. On the other hands, it was shown that the local distortion of B-site from K-edge XANES of Ti and Nb is very large. Therefore in the view of local structure, the structure of loparite is more suitable to rhombohedral.
We used loparite crystal: (Na0.57, REE0.31, Ca0.07)(Ti0.75, Nb0.25)O3 from Russia. We could refine the structure to R-3c and I4/mcm. On the other hands, it was shown that the local distortion of B-site from K-edge XANES of Ti and Nb is very large. Therefore in the view of local structure, the structure of loparite is more suitable to rhombohedral.