Influence of impurities on Cr3+ luminescence properties in Brazilian emerald and alexandrite

Nadège Ollier; Yves Fuchs; Olivier Cavani; Adolf Heinrich Horn; Stéphanie Rossano

doi:10.1127/ejm/2015/0027-2484

Influence of impurities on Cr³⁺ luminescence properties in Brazilian emerald and alexandrite

Nadège Ollier, Yves Fuchs, Olivier Cavani, Adolf Heinrich Horn, Stéphanie Rossano

Research output: Contribution to journal › Article › peer-review

Abstract

Emerald and alexandrite, the chromiferous varieties of beryl, Be₃Al₂[Si₆O₁₈], and chrysoberyl, BeAl₂O₄, respectively, are, as gems, of high economical and technological interest. The Cr³⁺ properties in natural beryl and chrysoberyl samples have been studied by mainly photoluminescence technique and electron paramagnetic resonance (EPR) as a function of Cr content (50-11370 ppm) as well as impurities, such as Fe and V. In emeralds, the Cr³⁺ crystal field value is linked to the Cr content and decreases when Cr increases. In chrysoberyl with low Cr content, the vanishing of Cr³⁺ emission from Cr³⁺ ions located on the inversion-symmetry site suggests a competition between Cr and V regarding chemical substitution. The Fe³⁺ ion substitutes efficiently on the mirrorsymmetry site, with a strong impact on the Cr³⁺ lifetime on this site.

Original language	English
Pages (from-to)	783-792
Number of pages	10
Journal	European Journal of Mineralogy
Volume	27
Issue number	6
DOIs	https://doi.org/10.1127/ejm/2015/0027-2484
Publication status	Published - 1 Dec 2015
Externally published	Yes

Keywords

Alexandrite
Beryl
Chromium
Chrysoberyl
Cr luminescence
EPR
Emerald
Gated time-resolved luminescence spectroscopy
Iron
Substitution
Vanadium

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10.1127/ejm/2015/0027-2484

Cite this

@article{801660f829aa40e2ae834da98125e616,

title = "Influence of impurities on Cr3+ luminescence properties in Brazilian emerald and alexandrite",

abstract = "Emerald and alexandrite, the chromiferous varieties of beryl, Be3Al2[Si6O18], and chrysoberyl, BeAl2O4, respectively, are, as gems, of high economical and technological interest. The Cr3+ properties in natural beryl and chrysoberyl samples have been studied by mainly photoluminescence technique and electron paramagnetic resonance (EPR) as a function of Cr content (50-11370 ppm) as well as impurities, such as Fe and V. In emeralds, the Cr3+ crystal field value is linked to the Cr content and decreases when Cr increases. In chrysoberyl with low Cr content, the vanishing of Cr3+ emission from Cr3+ ions located on the inversion-symmetry site suggests a competition between Cr and V regarding chemical substitution. The Fe3+ ion substitutes efficiently on the mirrorsymmetry site, with a strong impact on the Cr3+ lifetime on this site.",

keywords = "Alexandrite, Beryl, Chromium, Chrysoberyl, Cr luminescence, EPR, Emerald, Gated time-resolved luminescence spectroscopy, Iron, Substitution, Vanadium",

author = "Nad{\`e}ge Ollier and Yves Fuchs and Olivier Cavani and Horn, \{Adolf Heinrich\} and St{\'e}phanie Rossano",

note = "Publisher Copyright: {\textcopyright} 2015 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart.",

year = "2015",

month = dec,

day = "1",

doi = "10.1127/ejm/2015/0027-2484",

language = "English",

volume = "27",

pages = "783--792",

journal = "European Journal of Mineralogy",

issn = "0935-1221",

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TY - JOUR

T1 - Influence of impurities on Cr3+ luminescence properties in Brazilian emerald and alexandrite

AU - Ollier, Nadège

AU - Fuchs, Yves

AU - Cavani, Olivier

AU - Horn, Adolf Heinrich

AU - Rossano, Stéphanie

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Emerald and alexandrite, the chromiferous varieties of beryl, Be3Al2[Si6O18], and chrysoberyl, BeAl2O4, respectively, are, as gems, of high economical and technological interest. The Cr3+ properties in natural beryl and chrysoberyl samples have been studied by mainly photoluminescence technique and electron paramagnetic resonance (EPR) as a function of Cr content (50-11370 ppm) as well as impurities, such as Fe and V. In emeralds, the Cr3+ crystal field value is linked to the Cr content and decreases when Cr increases. In chrysoberyl with low Cr content, the vanishing of Cr3+ emission from Cr3+ ions located on the inversion-symmetry site suggests a competition between Cr and V regarding chemical substitution. The Fe3+ ion substitutes efficiently on the mirrorsymmetry site, with a strong impact on the Cr3+ lifetime on this site.

AB - Emerald and alexandrite, the chromiferous varieties of beryl, Be3Al2[Si6O18], and chrysoberyl, BeAl2O4, respectively, are, as gems, of high economical and technological interest. The Cr3+ properties in natural beryl and chrysoberyl samples have been studied by mainly photoluminescence technique and electron paramagnetic resonance (EPR) as a function of Cr content (50-11370 ppm) as well as impurities, such as Fe and V. In emeralds, the Cr3+ crystal field value is linked to the Cr content and decreases when Cr increases. In chrysoberyl with low Cr content, the vanishing of Cr3+ emission from Cr3+ ions located on the inversion-symmetry site suggests a competition between Cr and V regarding chemical substitution. The Fe3+ ion substitutes efficiently on the mirrorsymmetry site, with a strong impact on the Cr3+ lifetime on this site.

KW - Alexandrite

KW - Beryl

KW - Chromium

KW - Chrysoberyl

KW - Cr luminescence

KW - EPR

KW - Emerald

KW - Gated time-resolved luminescence spectroscopy

KW - Iron

KW - Substitution

KW - Vanadium

U2 - 10.1127/ejm/2015/0027-2484

DO - 10.1127/ejm/2015/0027-2484

M3 - Article

AN - SCOPUS:84959261168

SN - 0935-1221

VL - 27

SP - 783

EP - 792

JO - European Journal of Mineralogy

JF - European Journal of Mineralogy

IS - 6