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Spinodal decomposition in alkali feldspar studied by atom probe tomography
We used atom probe tomography to complement electron microscopy for the investigation of spinodal decomposition in alkali feldspar. To this end, gem-quality alkali feldspar of intermediate composition with a mole fraction of [Formula: see text] of the K end-member was prepared from Madagascar orthoc...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7319307/ https://www.ncbi.nlm.nih.gov/pubmed/32624637 http://dx.doi.org/10.1007/s00269-020-01097-4 |
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author | Petrishcheva, Elena Tiede, Lisa Schweinar, Kevin Habler, Gerlinde Li, Chen Gault, Baptiste Abart, Rainer |
author_facet | Petrishcheva, Elena Tiede, Lisa Schweinar, Kevin Habler, Gerlinde Li, Chen Gault, Baptiste Abart, Rainer |
author_sort | Petrishcheva, Elena |
collection | PubMed |
description | We used atom probe tomography to complement electron microscopy for the investigation of spinodal decomposition in alkali feldspar. To this end, gem-quality alkali feldspar of intermediate composition with a mole fraction of [Formula: see text] of the K end-member was prepared from Madagascar orthoclase by ion-exchange with (NaK)Cl molten salt. During subsequent annealing at [Formula: see text] and close to ambient pressure the ion-exchanged orthoclase unmixed producing a coherent lamellar intergrowth of Na-rich and K-rich lamellae. The chemical separation was completed, and equilibrium Na–K partitioning between the different lamellae was attained within four days, which was followed by microstructural coarsening. After annealing for 4 days, the wavelength of the lamellar microstructure was [Formula: see text] and it increased to [Formula: see text] after annealing for 16 days. The observed equilibrium compositions of the Na-rich and K-rich lamellae are in reasonable agreement with an earlier experimental determination of the coherent solvus. The excess energy associated with compositional gradients at the lamellar interfaces was quantified from the initial wavelength of the lamellar microstructure and the lamellar compositions as obtained from atom probe tomography using the Cahn–Hilliard theory. The capability of atom probe tomography to deliver quantitative chemical compositions at nm resolution opens new perspectives for studying the early stages of exsolution. In particular, it helps to shed light on the phase relations in nm scaled coherent intergrowth. |
format | Online Article Text |
id | pubmed-7319307 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-73193072020-07-01 Spinodal decomposition in alkali feldspar studied by atom probe tomography Petrishcheva, Elena Tiede, Lisa Schweinar, Kevin Habler, Gerlinde Li, Chen Gault, Baptiste Abart, Rainer Phys Chem Miner Original Paper We used atom probe tomography to complement electron microscopy for the investigation of spinodal decomposition in alkali feldspar. To this end, gem-quality alkali feldspar of intermediate composition with a mole fraction of [Formula: see text] of the K end-member was prepared from Madagascar orthoclase by ion-exchange with (NaK)Cl molten salt. During subsequent annealing at [Formula: see text] and close to ambient pressure the ion-exchanged orthoclase unmixed producing a coherent lamellar intergrowth of Na-rich and K-rich lamellae. The chemical separation was completed, and equilibrium Na–K partitioning between the different lamellae was attained within four days, which was followed by microstructural coarsening. After annealing for 4 days, the wavelength of the lamellar microstructure was [Formula: see text] and it increased to [Formula: see text] after annealing for 16 days. The observed equilibrium compositions of the Na-rich and K-rich lamellae are in reasonable agreement with an earlier experimental determination of the coherent solvus. The excess energy associated with compositional gradients at the lamellar interfaces was quantified from the initial wavelength of the lamellar microstructure and the lamellar compositions as obtained from atom probe tomography using the Cahn–Hilliard theory. The capability of atom probe tomography to deliver quantitative chemical compositions at nm resolution opens new perspectives for studying the early stages of exsolution. In particular, it helps to shed light on the phase relations in nm scaled coherent intergrowth. Springer Berlin Heidelberg 2020-06-07 2020 /pmc/articles/PMC7319307/ /pubmed/32624637 http://dx.doi.org/10.1007/s00269-020-01097-4 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Original Paper Petrishcheva, Elena Tiede, Lisa Schweinar, Kevin Habler, Gerlinde Li, Chen Gault, Baptiste Abart, Rainer Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title | Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title_full | Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title_fullStr | Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title_full_unstemmed | Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title_short | Spinodal decomposition in alkali feldspar studied by atom probe tomography |
title_sort | spinodal decomposition in alkali feldspar studied by atom probe tomography |
topic | Original Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7319307/ https://www.ncbi.nlm.nih.gov/pubmed/32624637 http://dx.doi.org/10.1007/s00269-020-01097-4 |
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