Phase Relations in the Na0.5Bi0.5TiO3–Li3xLa(2/3)−x□(1/3)−2xTiO3 System |
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Authors: | Matja Spreitzer,Bo tjan Jan ar, Danilo Suvorov |
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Affiliation: | Advanced Materials Department, "Jožef Stefan" Institute, Jamova 39, 1000 Ljubljana, Slovenia |
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Abstract: | The phase relations and the mechanism of solid-state synthesis for the Na0.5Bi0.5TiO3–Li3 x La(2/3)− x □(1/3)−2 x TiO3 system were investigated using X-ray powder diffraction, scanning electron microscopy, and thermal analysis. The study revealed that the extent of the homogeneity range—which is related to the A-site substitution between (Na0.5Bi0.5)2+ and (Li3 x La(2/3)− x □(1/3)−2 x )2+ pseudo cations of a perovskite structure—depends strongly on the ordering of the (Li3 x La(2/3)− x □(1/3)−2 x )2+ species. The solid-state reaction of the compounds in the homogeneity range is completed only after multiple high-temperature firings. However, the system is also subjected to a slow thermal decomposition; this is particularly so for the compounds with a high × value and an increased Li3 x La(2/3)− x □(1/3)−2 x TiO3 concentration. |
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