Oxidation state and local structure of chromium ions in laocl

Andris Antuzevičs; Guna Krieķe; Haralds Ozols; Andris Fedotovs; Anatolijs Šarakovskis; Aleksejs Kuzmins

doi:10.3390/ma14133539

Oxidation state and local structure of chromium ions in laocl

Andris Antuzevičs^*
, Guna Krieķe
, Haralds Ozols
, Andris Fedotovs
, Anatolijs Šarakovskis
, Aleksejs Kuzmins

^*Corresponding author for this work

University of Latvia

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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), multi-frequency 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.

Original language	English
Article number	3539
Journal	Materials
Volume	14
Issue number	13
DOIs	https://doi.org/10.3390/ma14133539
Publication status	Published - 1 Jul 2021

Keywords

Chromium
Electron paramagnetic resonance (EPR)
Electron-nuclear double resonance (ENDOR)
LaOCl
X-ray absorption spec-troscopy
X-ray photoelectron spectroscopy (XPS)

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title = "Oxidation state and local structure of chromium ions in laocl",

abstract = "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), multi-frequency 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.",

keywords = "Chromium, Electron paramagnetic resonance (EPR), Electron-nuclear double resonance (ENDOR), LaOCl, X-ray absorption spec-troscopy, X-ray photoelectron spectroscopy (XPS)",

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AU - Antuzevičs, Andris

AU - Krieķe, Guna

AU - Ozols, Haralds

AU - Fedotovs, Andris

AU - Šarakovskis, Anatolijs

AU - Kuzmins, Aleksejs

PY - 2021/7/1

Y1 - 2021/7/1

N2 - 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), multi-frequency 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.

AB - 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), multi-frequency 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.

KW - Chromium

KW - Electron paramagnetic resonance (EPR)

KW - Electron-nuclear double resonance (ENDOR)

KW - LaOCl

KW - X-ray absorption spec-troscopy

KW - X-ray photoelectron spectroscopy (XPS)

UR - https://www.mdpi.com/1996-1944/14/13/3539/htm

UR - https://www.scopus.com/pages/publications/85109133333

U2 - 10.3390/ma14133539

DO - 10.3390/ma14133539

M3 - Article

SN - 1996-1944

VL - 14

JO - Materials

JF - Materials

IS - 13

M1 - 3539

ER -

Oxidation state and local structure of chromium ions in laocl

Abstract

Keywords

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