Dielectric and ferroelectric properties of samarium substituted Aurivillius oxides

详细信息    查看全文

• 作者：M. Reddyprakash^a ; S.K. Rout^a ; ^{skrout@bitmesra.ac.in" class="auth_mail" title="E-mail the corresponding author} ; Avishek Satapathy^a ; T.P. Sinha^b ; S. Md. Sariful^b
• 关键词：Dielectric properties ; Ferroelectric properties ; BaBi4Ti4O15 ceramics
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：42
• 期：7
• 页码：8798-8803
• 全文大小：2059 K

文摘

Barium bismuth titanate ceramics doped with different concentration of samarium ${\mathrm{Ba}}_{1-(3/2)x}{\mathrm{Sm}}_x{\mathrm{Bi}}_4{\mathrm{Ti}}_4{\mathrm{O}}_{15}$, (x=0, 0.05, 0.10, 0.20, 0.30, and 0.40) were prepared by solid state reaction route. X-ray diffraction pattern confirmed that all compositions have a bismuth- layered perovskite structure with an orthorhombic phase of space group A2₁am. The plate-like grain morphology was observed for the compositions upto (x  =0, 0.05, and 0.10) and the shape changed for higher samarium (Sm³⁺)${(\mathrm{Sm}}^{3+})$ concentration. FT-IR study confirmed the presence of Bi–O stretching vibrations. The temperature dependent dielectric behavior showed a frequency dependent diffused phase transition above 400 °C and a broadening of phase transition with increasing Sm³⁺${\mathrm{Sm}}^{3+}$ content. The phase transition temperature shifted to higher temperatures with increasing Sm³⁺${\mathrm{Sm}}^{3+}$ content. Ferroelectric studies revealed that the remanent polarization (P_r$P_{\mathrm{r}}$) first increased, and then decreased with rising in dopant concentration. The maximum value of remanent polarization (P_r$P_{\mathrm{r}}$) was found to be 2.40 μC/cm²$\mathrm{\mu C}/{\mathrm{cm}}^2$for x=0.05$x=0.05$ composition at an applied electric field of 80 kV/cm.