کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1524586 | 995340 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and ferroelectric properties of rare earth compounds with tungsten bronze-type structure Synthesis and ferroelectric properties of rare earth compounds with tungsten bronze-type structure](/preview/png/1524586.png)
Polycrystalline materials with a general formula Pb2Na0.8R0.2Nb4.8Fe0.2O15 (R = Dy, Eu, Sm, Nd, La) have been synthesized, in air by a high temperature solid state reaction method. X-ray diffraction study, at room temperature, revealed that they crystallize in the tungsten bronze-type structure. Dielectric properties were performed, in the temperature range 25–500 °C, at three different frequencies 10, 100 and 1000 kHz. The ferroelectric transition is pronounced by a large thermal hysteresis during the heating and cooling cycles. The determined Curie temperature values Tc were discussed as a function of rare earth size. Phase transitions around Tc for the investigated compounds were confirmed by differential scanning calorimetry (DSC) measurements.
• Polycrystalline materials with the tungsten bronze-type structure have been synthesized and characterized.
• Effect of the incorporation of rare earth ions and paramagnetic cations (Fe3+) into a matrix ferroelectrically active was studied.
• Ferroelectric transition is pronounced by a large thermal hysteresis during the heating and cooling cycles.
• Phase transitions around Tc were confirmed by differential scanning calorimetry (DSC) measurements.
Journal: Materials Chemistry and Physics - Volume 129, Issue 3, 3 October 2011, Pages 673–677