New compounds of sodium samarium titanate Na0.5Sm4.5Ti4O15 and sodium europium titanate Na0.5Eu4.5Ti4O15 were synthesized successfully by solid state reaction at 1300 degrees C and 1200 degrees C, respectively. The lattice parameters of Na0.5Sm4.5Ti4O15 and Na0.5Eu4.5Ti4O15 were determined at ordinary temperature by using X-ray powder diffraction method. Their Lattice types were determined, and their patterns were indexed. Polycrystalline X-ray diffraction data of sodium samarium titanate were listed. Differences of their crystal structures were analyzed and discussed.
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