| The Structure Determination of La2/3-xLi3x□1/3-2xTiO3 by the Powder Neutron and X-ray Diffraction |
| Eun-Tae Kang, Young-Jean Kwon1 |
Department of Ceramic Engineering, Gyeongsang National University
1Dongkuk Industries |
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| ABSTRACT |
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La/sub 2/3-x/Li/sub 3x/□/sub 1/3-2x/TiO₃ compounds with x=0.13 and 0.12 were prepared by slow cooling (x=0.13) and rapid quenching (x=0.12) into the liquid nitrogen after sintering at 1350℃ for 6 h. Their crystal structure has been determined by Rietveld refinement of both the powder neutron and X-ray diffraction data. From neutron diffraction data, we found that the main phase was not tetragonal (P4/mmm), but trigonal (R3cH). The refinement of neutron diffraction for the slow cooled samples were in a good agreement with a new model; a mixture of trigonal (R3cH, 45.7 wt％), tetragonal (p4/mmm, 37.0 wt％), and Li/sub 0.57/Ti/sub 0.86/O₂(pbnm, 17.2 wt%), but the quenched sample was found not to contain tetragonal (p4/mmm). X-ray diffraction data couldn't be well fitted because of the Poor scattering factor of lithium ions and the similar reflection patterns among trigonal (R3cH), tetragonal (p4/mmm), and cubic (Pm3m). We also knew that one transport bottlenecks is destroyed by one La vacancy in the case of trigonal (R3cH). |
| Key words:
${La_{0.5}}{Li_{0.5}}{YiO_3}$, Rietveld refinement, Neutron diffraction, XRD diffraction, Trigonal (R3cH) |
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