The effect of rare earth Dy³⁺ ions on structural, dielectric and electrical behavior of new nanocrystalline PbZrO₃ perovskites

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• 作者：Muhammad Asim Shahzad^a ; ^{asimshahzad76@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Muhammad Shahid^b ; Ismat Bibi^b ; Muhammad Azhar Khan^a ; Muhammad Asif Nawaz^a ; Mohamed F. Aly Aboud^c ; ^d ; M. Asghar^a ; Rizwan Nasir Paracha^e ; Muhammad Farooq Warsi^b ; ^{farooq.warsi@iub.edu.pk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lead zirconate nanostructure ; Micro-emulsion ; X-ray diffraction ; FTIR ; Dielectric response ; Dc-electrical resistivity
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1073-1079
• 全文大小：823 K

文摘

Dy³⁺ metal ions doped nanocrystalline lead zirconate perovskite with nominal composition Pb_1−1.5xDy_xZrO₃ (x=0, 0.01, 0.02, 0.03, 0.04 and 0.05) were fabricated by wet chemical micro-emulsion technique. The annealing of all the samples was done at 700 °C for 3 h. The prepared nanocrystalline powder was characterized by different techniques such as X-ray powder diffraction (XRD), Fourier transforms infra-red spectroscopy (FTIR), dielectric response and dc-electrical resistivity. The powder XRD pattern confirmed the development of orthorhombic perovskite structure and the size of crystallite was calculated in the range of 45–135 nm. The lattice parameters and the crystallite size were demonstrated a nonlinear trend. The FTIR spectra were represented the intrinsic cation's vibration in the characteristic perovskite orthorhombic structure which observed in the range of 500−4000 cm⁻¹. The dielectric properties of all the prepared samples were measured in the range of 1×10⁶ to 1×10⁹ Hz at room temperature. The decreasing trend in dielectric characteristics was observed with the incorporation of Dy³⁺ metal ions in PbZrO₃ and also in these dielectric parameters, the damping effect was observed due to the replacement of Pb²⁺ ions with Dy³⁺ ions in the region of higher frequency. The ac conductivity was measured in the range of 6.94×10⁻⁵–2.73×10⁻⁵ (Ω cm)⁻¹ by using dielectric results at 1.5 MHz frequency. Such results revealed that the ac conductivity have decreasing behavior with the doping of Dy³⁺ ions in PbZrO₃ nanocrystals. The current voltage (I-V) measurements depicted the increase in DC-electrical resistivity with increase of Dy³⁺ content in lead zirconate. The minimum and maximum resistivities were observed as 1.315×10¹¹ Ω cm for PbZrO₃ and 2.206×10¹¹ Ω cm for Pb_0.955Dy_0.03ZrO₃ nanocrystals, hence two fold increase in DC-electrical resistivity was found. The dominating influence of doping on dielectric and electric parameters is highly encouraging for the manufacturing of high frequency memory devices.