Studies on the structural, electrical and magnetic properties of LaCrO 3, LaCr 0.5Cu 0.5O 3 and LaCr 0.5Fe 0.5O 3 by sol-gel method

V. D. Nithya, R. Jacob Immanuel, S. T. Senthilkumar, C. Sanjeeviraja, I. Perelshtein, D. Zitoun, R. Kalai Selvan

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Abstract

The structural, electrical and magnetic properties of LaCr 0.5M 0.5O 3 (M = Cr 3+, Cu 2+ and Fe 3+) 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 Cu 2+ and Fe 3+ on the electrical properties of LaCrO 3 were studied using impedance spectroscopy at room temperature (RT). The properties of LaCr 0.5Cu 0.5O 3 were studied over a wide range of temperature from RT to 533 K. A maximum conductivity of 1.7 × 10 -3 S cm -1 was observed for LaCr 0.5Cu 0.5O 3 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 LaCrO 3 to behave ferromagnetically on the addition of Cu 2+ and Fe 3+, and the magnetization was found to be enhanced in the LaCr 0.5Fe 0.5O 3.

Original languageEnglish
Pages (from-to)1861-1868
Number of pages8
JournalMaterials Research Bulletin
Volume47
Issue number8
DOIs
StatePublished - Aug 2012

Keywords

  • B. Sol-gel chemistry
  • C. Impedance spectroscopy
  • D. Dielectric properties
  • D. Magnetic properties

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