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Oxidation State and Local Structure of Chromium Ions in LaOCl

Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
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Academic Editor: Rainer Niewa
Materials 2021, 14(13), 3539; https://doi.org/10.3390/ma14133539
Received: 11 May 2021 / Revised: 22 June 2021 / Accepted: 23 June 2021 / Published: 25 June 2021
(This article belongs to the Section Advanced Materials Characterization)
LaOCl doped with 0–10 mol% Cr was synthesized by thermal decomposition of chlorides. X-ray diffraction (XRD) analysis revealed that incorporation of chromium results in a decrease of the lattice parameter a and a simultaneous increase of the lattice parameter c. The local structure of chromium ions was studied with X-ray photoelectron (XPS), X-ray absorption (XANES), multifrequency electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) spectroscopy techniques. It was determined that synthesis in oxidizing atmosphere promotes the incorporation of chromium ions predominantly in the 5+ oxidation state. Changes of chromium oxidation state and local environment occur after a subsequent treatment in reducing atmosphere. Spin-Hamiltonian (SH) parameters for a Cr5+ and two types of Cr3+ centers in LaOCl were determined from the EPR spectra simulations. View Full-Text
Keywords: LaOCl; chromium; X-ray photoelectron spectroscopy (XPS); X-ray absorption spectroscopy; electron paramagnetic resonance (EPR); electron-nuclear double resonance (ENDOR) LaOCl; chromium; X-ray photoelectron spectroscopy (XPS); X-ray absorption spectroscopy; electron paramagnetic resonance (EPR); electron-nuclear double resonance (ENDOR)
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MDPI and ACS Style

Antuzevics, A.; Krieke, G.; Ozols, H.; Fedotovs, A.; Sarakovskis, A.; Kuzmin, A. Oxidation State and Local Structure of Chromium Ions in LaOCl. Materials 2021, 14, 3539. https://doi.org/10.3390/ma14133539

AMA Style

Antuzevics A, Krieke G, Ozols H, Fedotovs A, Sarakovskis A, Kuzmin A. Oxidation State and Local Structure of Chromium Ions in LaOCl. Materials. 2021; 14(13):3539. https://doi.org/10.3390/ma14133539

Chicago/Turabian Style

Antuzevics, Andris, Guna Krieke, Haralds Ozols, Andris Fedotovs, Anatolijs Sarakovskis, and Alexei Kuzmin. 2021. "Oxidation State and Local Structure of Chromium Ions in LaOCl" Materials 14, no. 13: 3539. https://doi.org/10.3390/ma14133539

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