Studies on the structural, electrical and magnetic properties of LaCrO₃, LaCr_0.5Cu_0.5O₃ and LaCr_0.5Fe_0.5O₃ by sol-gel method

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• 作者：V.D. Nithya^a ; R. Jacob Immanuel^a ; S.T. Senthilkumar^a ; C. Sanjeeviraja^b ; I. Perelshtein^c ; D. Zitoun^c ; R. Kalai Selvan^a ; ^{selvankram@buc.edu.in}
• 关键词：B. Sol&ndash ; gel chemistry ; C. Impedance spectroscopy ; D. Dielectric properties ; D. Magnetic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：August, 2012
• 卷：47
• 期：8
• 页码：1861-1868
• 文件大小：1213 K

摘要

The structural, electrical and magnetic properties of LaCr_0.5M_0.5O₃ (M = Cr³⁺, Cu²⁺ and Fe³⁺) synthesized by a sol-gel technique were studied. The X-ray diffraction pattern shows the structure to be orthorhombic and the size of the particles is around 100 nm as seen from the TEM images. The effects of Cu²⁺ and Fe³⁺ on the electrical properties of LaCrO₃ were studied using impedance spectroscopy at room temperature (RT). The properties of LaCr_0.5Cu_0.5O₃ were studied over a wide range of temperature from RT to 533 K. A maximum conductivity of 1.7 脳 10^鈭? S cm^鈭? was observed for LaCr_0.5Cu_0.5O₃ at a measured temperature of 533 K. The impedance spectra indicate a negative temperature coefficient of resistance (NTCR) and also imply the conduction is through bulk of the material. The magnetic studies performed using a SQUID magnetometer interpret the antiferromagnetically ordered LaCrO₃ to behave ferromagnetically on the addition of Cu²⁺ and Fe³⁺, and the magnetization was found to be enhanced in the LaCr_0.5Fe_0.5O₃.