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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2017: 1.144
5-year IMPACT FACTOR: 1.144

CiteScore 2017: 1.08

SCImago Journal Rank (SJR) 2017: 0.495
Source Normalized Impact per Paper (SNIP) 2017: 0.495

Online
ISSN
2196-7156
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Volume 230, Issue 4

Issues

Local Structure of Cobalt Tungstate Revealed by EXAFS Spectroscopy and Reverse Monte Carlo/Evolutionary Algorithm Simulations

Janis Timoshenko / Andris Anspoks / Aleksandr Kalinko / Alexei Kuzmin
Published Online: 2015-12-11 | DOI: https://doi.org/10.1515/zpch-2015-0646

Abstract

EXAFS spectroscopy is an element-specific method that can provide perhaps the most extensive information on the local atomic structure and lattice dynamics for a broad class of materials. Conventional methods of EXAFS data treatment are often limited to the nearest coordination shells of the absorbing atom due to the difficulties in accurate accounting for the large number of correlated structural parameters that have to be included in the analysis. In this study we overcome this problem by applying novel simulation-based method: reverse Monte Carlo simulations, coupled with the evolutionary algorithm and with a powerful signal processing technique – wavelet transform. This complex approach was applied to the analysis of the W L3-edge and Co K-edge EXAFS spectra of crystalline CoWO4, which exists in antiferromagnetic state below 55 K. Temperature dependence of the local environment up to 4.3 Å around both metal ions was reconstructed in the range from 10 K to 300 K, and the rigidity of the tungstate structure due to zigzag chains of WO6 and CoO6 octahedra was analyzed.

Keywords: EXAFS; Reverse Monte Carlo; Evolutionary Algorithm; Wavelet Transform; Cobalt Tungstate

About the article

Accepted: 2015-11-03

Received: 2015-06-15

Published Online: 2015-12-11

Published in Print: 2016-04-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 230, Issue 4, Pages 551–568, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2015-0646.

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