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Frontispiece: Oxygen Vacancy Induced Structural Distortions in Black Titania: A Unique Approach using Soft X‐ray EXAFS at the O–K Edge
Author(s) -
Leedahl Brett,
de Boer Tristan,
Yuan Xiaotao,
Moewes Alexander
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201981361
Subject(s) - distortion (music) , extended x ray absorption fine structure , vacancy defect , relaxation (psychology) , photon energy , materials science , crystal (programming language) , oxygen , physics , k edge , photon , atomic physics , crystallography , condensed matter physics , chemistry , optics , absorption spectroscopy , psychology , amplifier , social psychology , optoelectronics , cmos , quantum mechanics , computer science , programming language
The background is a 2D intensity image of the photons emitted from the black titania (TiO 2 ) sample under study. The horizontal axis is the incident energy from 500–1000 eV. Thus, it is evident that emission photons from Ti, O, Fe, Ni, and Cu are observed. By focusing only on the strong oxygen emission (which oscillates as a function of incident energy), interatomic distances in black TiO 2 are deduced, which are used to determine the crystallographic distortion that causes it to be black (instead of regular white). This distortion can be understood in terms of the relaxation undergone by the crystal in the presence of an oxygen vacancy. The crystallographic distortion and oxygen vacancy are also both illustrated in the artwork. For more information, see the Full Paper by Leedahl et al. on page 3272.