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|Title:||Ferroelectric lead scandium tantalate from mechanical activation of mixed oxides|
|Citation:||Lim, J., Xue, J.M., Wang, J. (2002-04-28). Ferroelectric lead scandium tantalate from mechanical activation of mixed oxides. Materials Chemistry and Physics 75 (1-3) : 157-160. ScholarBank@NUS Repository. https://doi.org/10.1016/S0254-0584(02)00046-9|
|Abstract:||Conventional mixed oxide preparation of lead scandium tantalate, PbSc0.5Ta0.5O3 (PST) powder, requires two calcinations steps, the first of which is to form a Wolframite precursor and the resulting PST phase is structurally long-range ordered. In this work, we report the synthesis of perovskite PST via a novel one-step mechanical activation route, which leads to a long-range disordered structure as verified by X-ray diffraction. Sintered PSTs from the mechanically activated powders also retain the long-range disordered perovskite structure up to 1250 °C, while > 95% theoretical density was achieved. They exhibit a spontaneous ferroelectric-relaxor transition at 15 °C with a maximum dielectric constant of ∼13,850 and dielectric loss of < 0.04. © 2002 Elsevier Science B.V. All rights reserved.|
|Source Title:||Materials Chemistry and Physics|
|Appears in Collections:||Staff Publications|
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