Ferroelectric, dielectric, and optical properties of Nd-substituted Bi₄Ti₃O₁₂ nanoparticles synthesized by sol-gel method

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• 作者：A. Marikani^a ; V. Selvamurugan^a ; ^{vselvamurugan2007@gmail.com} ; G. Mangamma^b ; S. Ravi^a ; R. Krishnasharma^a ; P.V. Chandrasekar^c ; M. Kamruddin^b ; D. Madhavan^d
• 关键词：Nanostructures ; Sol-gel method ; X-ray diffraction ; Dielectric properties ; Photoluminescence ; Ferroelectric materials
• 刊名：Progress in Natural Science: Materials International
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：26
• 期：6
• 页码：528-532
• 全文大小：1764 K
• 卷排序：26

文摘

This paper reports the synthesis of neodymium substituted bismuth titanate nanoparticles (BNdT) for ferroelectric random access memory (FeRAM) based applications using sol-gel route. X-ray diffraction pattern showed that the BNdT nanoparticles exhibited perovskite structure with orthorhombic phase. The microstructure of the BNdT nanoparticles showed that the grains were in spherical structure with a bi-modal distribution of spheres. Dielectric constant and dielectric loss of BNdT nanoparticles were measured in the frequency range 100 Hz to 100kHz. Nd-substituted BNdT nanoparticles showed the high remanent polarization (Pr=33.2 μC/cm2, Ec=62.5 kV/cm) than pure bismuth titanate (BT) (Pr=14.6 μC/cm2, Ec=182.8 kV/cm) ideal for FeRAM based applications. The occurrence of red shift in photoluminescence (PL) spectrum is considered to be due to the isomerisation that may occur from the heating of samples.