La1−xCexCrO3 (0.0 ≤x≤ 1.0): a new series of solid solutions with tunable magnetic and optical properties

Shukla, Rakesh ; Manjanna, Jayappa ; Bera, Anup K. ; Yusuf, Seikh M. ; Tyagi, Avesh K. (2009) La1−xCexCrO3 (0.0 ≤x≤ 1.0): a new series of solid solutions with tunable magnetic and optical properties Inorganic Chemistry, 48 (24). pp. 11691-11696. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic901735d

Related URL: http://dx.doi.org/10.1021/ic901735d

Abstract

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.

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