The red to near-infrared luminescence in alkali feldspar
Results are presented for the radio-, cathodo- and ionoluminescence (RL, CL and IL) of an ordered. exsolved alkali feldspar from South Greenland (BM2). BM2, a microperthite typical of many evolved rocks, has a broad red near-infrared luminescence, which, using lifetime-resolved CL. reveals four over...
Published in: | Contributions to Mineralogy and Petrology |
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2002
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/e9f30da1-a2b6-40d6-bc4a-6f5c7da2f307 2024-06-23T07:53:25+00:00 The red to near-infrared luminescence in alkali feldspar Brooks, RM Finch, Adrian Anthony Hole, D Townsend, PD Wu, Z 2002-07 https://research-portal.st-andrews.ac.uk/en/researchoutput/the-red-to-nearinfrared-luminescence-in-alkali-feldspar(e9f30da1-a2b6-40d6-bc4a-6f5c7da2f307).html https://doi.org/10.1007/s00410-002-0359-4 http://www.scopus.com/inward/record.url?scp=0036664109&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/the-red-to-nearinfrared-luminescence-in-alkali-feldspar(e9f30da1-a2b6-40d6-bc4a-6f5c7da2f307).html info:eu-repo/semantics/restrictedAccess Brooks , RM , Finch , A A , Hole , D , Townsend , PD & Wu , Z 2002 , ' The red to near-infrared luminescence in alkali feldspar ' , Contributions to Mineralogy and Petrology , vol. 143 , no. 4 , pp. 484-494 . https://doi.org/10.1007/s00410-002-0359-4 ND-YAG CATHODOLUMINESCENCE THERMOLUMINESCENCE article 2002 ftunstandrewcris https://doi.org/10.1007/s00410-002-0359-4 2024-06-13T00:10:12Z Results are presented for the radio-, cathodo- and ionoluminescence (RL, CL and IL) of an ordered. exsolved alkali feldspar from South Greenland (BM2). BM2, a microperthite typical of many evolved rocks, has a broad red near-infrared luminescence, which, using lifetime-resolved CL. reveals four overlapping emissions, of which two are dominant. These derive from Fe3+-activated luminescence from the low albite and maximum microcline components of the microperthite in which the Fe is on the most ordered tetrahedral site. The temperature dependence of the emission shows a smooth change from longer wavelengths at 20 K to shorter values at room temperature. There is a broad relationship between Fe-O bond distance and the energy of the luminescence. Comparisons of RL. CL and IL allow features in the luminescence associated with Surface states to be identified. The dependence of red RL intensity versus temperature is divided into four regions for which the activation energies and temperature ranges are estimated. Variations in RL intensity between 67 and 225 K are interpreted as a phase transition in microcline. RL intensity indicates a multi-stage transformation, proceeding via a first step between 67 and similar to100 K in which luminescence intensity increases, followed by a region between 100 and similar to225 K in which intensity falls. A discontinuity in intensity at similar to225 K marks the end of the second region. These variations may result from changes in the bond angles of bridging oxygens. IL dose dependence studies have been performed. As implantation progresses, the red/IR emission profile skews towards short wavelengths, reflecting amorphisation of the structure and local variations in Fe O bond distances. If the sample recovers for 24 h, the luminescence profile partly returns to its original state, but remains skewed, reflecting partial resumption of short-range order. Such profiles are also observed from natural shocked feldspars, and it may be that ion beam damage is akin to Structural modifications ... Article in Journal/Newspaper Greenland University of St Andrews: Research Portal Greenland Contributions to Mineralogy and Petrology 143 4 484 494 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ND-YAG CATHODOLUMINESCENCE THERMOLUMINESCENCE |
spellingShingle |
ND-YAG CATHODOLUMINESCENCE THERMOLUMINESCENCE Brooks, RM Finch, Adrian Anthony Hole, D Townsend, PD Wu, Z The red to near-infrared luminescence in alkali feldspar |
topic_facet |
ND-YAG CATHODOLUMINESCENCE THERMOLUMINESCENCE |
description |
Results are presented for the radio-, cathodo- and ionoluminescence (RL, CL and IL) of an ordered. exsolved alkali feldspar from South Greenland (BM2). BM2, a microperthite typical of many evolved rocks, has a broad red near-infrared luminescence, which, using lifetime-resolved CL. reveals four overlapping emissions, of which two are dominant. These derive from Fe3+-activated luminescence from the low albite and maximum microcline components of the microperthite in which the Fe is on the most ordered tetrahedral site. The temperature dependence of the emission shows a smooth change from longer wavelengths at 20 K to shorter values at room temperature. There is a broad relationship between Fe-O bond distance and the energy of the luminescence. Comparisons of RL. CL and IL allow features in the luminescence associated with Surface states to be identified. The dependence of red RL intensity versus temperature is divided into four regions for which the activation energies and temperature ranges are estimated. Variations in RL intensity between 67 and 225 K are interpreted as a phase transition in microcline. RL intensity indicates a multi-stage transformation, proceeding via a first step between 67 and similar to100 K in which luminescence intensity increases, followed by a region between 100 and similar to225 K in which intensity falls. A discontinuity in intensity at similar to225 K marks the end of the second region. These variations may result from changes in the bond angles of bridging oxygens. IL dose dependence studies have been performed. As implantation progresses, the red/IR emission profile skews towards short wavelengths, reflecting amorphisation of the structure and local variations in Fe O bond distances. If the sample recovers for 24 h, the luminescence profile partly returns to its original state, but remains skewed, reflecting partial resumption of short-range order. Such profiles are also observed from natural shocked feldspars, and it may be that ion beam damage is akin to Structural modifications ... |
format |
Article in Journal/Newspaper |
author |
Brooks, RM Finch, Adrian Anthony Hole, D Townsend, PD Wu, Z |
author_facet |
Brooks, RM Finch, Adrian Anthony Hole, D Townsend, PD Wu, Z |
author_sort |
Brooks, RM |
title |
The red to near-infrared luminescence in alkali feldspar |
title_short |
The red to near-infrared luminescence in alkali feldspar |
title_full |
The red to near-infrared luminescence in alkali feldspar |
title_fullStr |
The red to near-infrared luminescence in alkali feldspar |
title_full_unstemmed |
The red to near-infrared luminescence in alkali feldspar |
title_sort |
red to near-infrared luminescence in alkali feldspar |
publishDate |
2002 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/the-red-to-nearinfrared-luminescence-in-alkali-feldspar(e9f30da1-a2b6-40d6-bc4a-6f5c7da2f307).html https://doi.org/10.1007/s00410-002-0359-4 http://www.scopus.com/inward/record.url?scp=0036664109&partnerID=8YFLogxK |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Brooks , RM , Finch , A A , Hole , D , Townsend , PD & Wu , Z 2002 , ' The red to near-infrared luminescence in alkali feldspar ' , Contributions to Mineralogy and Petrology , vol. 143 , no. 4 , pp. 484-494 . https://doi.org/10.1007/s00410-002-0359-4 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/the-red-to-nearinfrared-luminescence-in-alkali-feldspar(e9f30da1-a2b6-40d6-bc4a-6f5c7da2f307).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00410-002-0359-4 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
143 |
container_issue |
4 |
container_start_page |
484 |
op_container_end_page |
494 |
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1802645025791672320 |