Special Issue "X-ray Absorption Spectroscopy of Synthetic and Natural Minerals"

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Crystallography and Physical Chemistry of Minerals".

Deadline for manuscript submissions: 31 October 2020.

Special Issue Editor

Dr. Alexander Trigub
Website
Guest Editor
Department of Synchrotron and Neutron Radiation, Kurchatov Institute, 123098 Moscow, Russia
Interests: XAS; EXAFS; XANES; DFT; atomic structure; synchrotron radiation

Special Issue Information

Dear Colleagues,

In order to understand the properties of materials and improve them, we need to know their atomic and electronic structure. One of the structural methods used to determine atomic structure is X-ray absorption spectroscopy (XAS). Due to their ability to solve a wide range of scientific problems, XAS techniques are widely used for determining the atomic structure of liquids, melts, and minerals. X-ray absorption spectroscopy (XAS) methods, including pre-edge, x-ray absorption near‐edge structure (XANES), extended x‐ray absorption fine structure (EXAFS) regions, and the detection of fluorescence yield with high energy resolution (HERFD XAS), provide quantitative characteristics of geological matter.

EXAFS provides reliable structural information concerning local, short-range atomic structure, including the number, chemical nature, and distances to neighboring atoms from the atomic site of interest.

XANES and HERFD XAS provide information concerning the oxidation state of an absorbing atom and the symmetry of its local atomic surroundings. XANES spectra are quiet difficult to analyse, but can be used for straightforward analysis of atomic and electronic structures.

Another advantage of the XAS is applicability for the investigation of electronic states and the atomic geometry of impurities with very low concentrations. 

This Special Issue aims to publish papers with applications and demonstrations of the ability of XAS techniques to solve the atomic and electronic structures of synthetic and natural minerals.

Dr. Alexander Trigub
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • XAS
  • XANES
  • EXAFS
  • minerals

Published Papers (1 paper)

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Research

Open AccessArticle
An X-ray Absorption Near-Edge Structure (XANES) Study on the Oxidation State of Chromophores in Natural Kunzite Samples from Nuristan, Afghanistan
Minerals 2020, 10(5), 463; https://doi.org/10.3390/min10050463 - 20 May 2020
Abstract
Kunzite, the pink variety of spodumene is famous and desirable among gemstone lovers. Due to its tenebrescent properties, kunzite always remains a hot research candidate among physicists and mineralogists. The present work is continuing the effort towards value addition to kunzite by enhancing [...] Read more.
Kunzite, the pink variety of spodumene is famous and desirable among gemstone lovers. Due to its tenebrescent properties, kunzite always remains a hot research candidate among physicists and mineralogists. The present work is continuing the effort towards value addition to kunzite by enhancing its color using different treatments. Before color enhancement, it is essential to identify the chromophores and their oxidation states. In this paper, the authors investigated the main impurities in natural kunzite from the Nuristan area in Afghanistan and their valence states. Some impurities in the LiAlSi2O6 spodumene structure were identified and quantified by using sensitive techniques, including Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), UV−VIS and X-ray absorption near-edge structure (XANES). LA-ICP-MS indicated many trace elements as impurities in kunzite, among which Fe and Mn are the main elements responsible for coloration. The oxidation states of these two transition elements were determined by the XANES technique. The study reveals that Mn is present in both Mn2+ and Mn3+ oxidation states, while Fe is present only in Fe3+ oxidation state. Full article
(This article belongs to the Special Issue X-ray Absorption Spectroscopy of Synthetic and Natural Minerals)
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