American Chemical Society
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La1−xCexCrO3 (0.0 ≤ x ≤ 1.0): A New Series of Solid Solutions with Tunable Magnetic and Optical Properties

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journal contribution
posted on 2009-12-21, 00:00 authored by Rakesh Shukla, Jayappa Manjanna, Anup K. Bera, Seikh M. Yusuf, Avesh K. Tyagi
A new series of La1−xCexCrO3 (0.0 ≤ x ≤1.0) compounds in nanocrystalline form were synthesized using a two-step synthesis route, involving an initial combustion reaction followed by vacuum heating in the presence of a Zr sponge, which acted as an oxygen getter. For the first time, a homogeneous solid solution formation throughout the entire range was obtained in this series. These compounds were characterized using X-ray diffraction, diffuse reflectance UV visible spectrophotometry, and superconducting quantum interference device magnetometry. The crystallite size for the phase-pure products was confirmed to be ∼42−44 nm by high-resolution transmission electron microscopy. All compounds (nanocrystalline) in this series are found to be predominantly antiferromagnetic in nature with a remarkable linear increasing trend in Neel temperature from 257 to 281.5 K as a function of decreasing Ce3+ content. Interestingly, the band gap also shows a linear decrease from 3.21 to 3.02 eV as a function of increasing Ce3+ concentration in the La1−xCexCrO3 series.