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Elsevier, Journal of the European Ceramic Society, 3(32), p. 611-618, 2012

DOI: 10.1016/j.jeurceramsoc.2011.10.002

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Structural and physical properties of microwave synthesized orthorhombic perovskite erbium chromite ErCrO3

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This paper is available in a repository.

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Abstract

Rare-earth chromite ErCrO 3 powder was synthesized from metal nitrate precursors using microwave synthesis. (Micro-) structural characterizations were performed using X-ray diffraction, Rietveld refinement, High Resolution Transmission Electron Microscopy and Electron Micro-Diffraction. Magnetization vs. temperature measurements revealed anti-ferromagnetism with T Neel ≈ 135 K. An anti-ferrimagnetic moment of ≈0.4 μ B was determined from magnetization vs. applied field measurements. Temperature dependent impedance spectroscopy (IS) indicated 3 dielectric relax-ation processes: electrode interface, grain boundary and bulk. The intrinsic bulk activation energy was found to be 0.27 eV and the dielectric permittivity ε r was ≈23 in excellent agreement with Clausius–Mossotti predictions and showed no perceptible temperature dependence. This and the low ε r value suggested that ErCrO 3 is a dielectric rather than ferroelectric compound. IS measurements with applied dc bias revealed the signs of an unconventional type of Schottky barrier at the metallic Au electrode/ceramic ErCrO 3 interface.