The polycrystalline samples of 0.8BiSm_(x)Fe_(1-x)O_(3)–0.2PbTiO_(3)(x=0.05;0.10;0.15 and 0.20)were prepared by using the conventional solid-state reaction technique and sintered at high temperature(850℃).X-ray diff...The polycrystalline samples of 0.8BiSm_(x)Fe_(1-x)O_(3)–0.2PbTiO_(3)(x=0.05;0.10;0.15 and 0.20)were prepared by using the conventional solid-state reaction technique and sintered at high temperature(850℃).X-ray diffraction(XRD)confirms the distorted rhombohedral crystal structure for all the composites at room temperature.The surface morphology was checked by field-emission scanning electron microscope(FESEM)technique and homogeneous mixing of the components was confirmed by energydispersive analysis of X-ray(EDAX).The detailed study of dielectric properties of the composites reveals an increasing nature of dielectric constant(ε_(r))and loss tangent(tanδ)with the increase of temperature due to thermal activation.The Arrhenius plots of temperature dependence of AC conductivity yield the activation energy within the material at high-temperature range.The ferroelectric study shows that the remnant polarization decreases with the increase of Samarium(Sm)concentration.展开更多
基金One of the authors(Truptimayee Sahu)acknowledges the financial support through DST-INSPIRE Fellowship to carry out the research work.The author also acknowledges the financial support through DRS-1 of UGC,New Delhi,India,under the SAP and FIST Programmes of DST,New Delhi,India,for the development of research work at School of Physics,Sambalpur University,Odisha.One of the authors(B.Behera)acknowledges the SERB,New Delhi,India,under DST Fast Track Scheme for Young Scientist(Project No.SR/FTP/PS-036/2011).
文摘The polycrystalline samples of 0.8BiSm_(x)Fe_(1-x)O_(3)–0.2PbTiO_(3)(x=0.05;0.10;0.15 and 0.20)were prepared by using the conventional solid-state reaction technique and sintered at high temperature(850℃).X-ray diffraction(XRD)confirms the distorted rhombohedral crystal structure for all the composites at room temperature.The surface morphology was checked by field-emission scanning electron microscope(FESEM)technique and homogeneous mixing of the components was confirmed by energydispersive analysis of X-ray(EDAX).The detailed study of dielectric properties of the composites reveals an increasing nature of dielectric constant(ε_(r))and loss tangent(tanδ)with the increase of temperature due to thermal activation.The Arrhenius plots of temperature dependence of AC conductivity yield the activation energy within the material at high-temperature range.The ferroelectric study shows that the remnant polarization decreases with the increase of Samarium(Sm)concentration.
