A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa

O'Bannon, III, Earl F.; Williams, Quentin

doi:10.2138/am-2019-7079

Title: A Cr³⁺ luminescence study of natural topaz Al₂SiO₄(F,OH)₂ up to 60 GPa

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Abstract

Topaz [Al₂SiO₄(F,OH)₂] is a subduction-related mineral that is found in metasediments and has a large pressure and temperature stability field. Here, we use luminescence spectroscopy of Cr³⁺ to probe the Al site in topaz at pressures up to ~60 GPa, which corresponds to a depth of ~1400 km in the Earth. This technique allows us to probe all three unique Al environments (i.e., [AlO₄(OH)₂]^7–, [AlO₄(F)₂]^7–, and [AlO4OH,F]7–) simultaneously under high pressure. We find that the R-line luminescence from all three Al environments shift linearly to longer wavelength to ~40 GPa. Above ~40 GPa, they shift nonlinearly and begin to flatten out at ~48 GPa, with a pressure shift of ~0 cm^–1/GPa from ~48–55 GPa. Our results, combined with previous high-pressure single-crystal X-ray diffraction studies to ~45 GPa, strongly indicate that there is a change in the compression mechanism in topaz above ~40 GPa. Furthermore, our high-pressure room-temperature results show that the metastable persistence of topaz on compression represents one of the most extreme cases among tetrahedrally coordinated silicates.

Authors:

^[1]; Williams, Quentin ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Santa Cruz, CA (United States)

Publication Date:: Fri Nov 01 00:00:00 EDT 2019

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1573158

Report Number(s):: LLNL-JRNL-772914
Journal ID: ISSN 0003-004X; 963785; TRN: US2001083

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: American Mineralogist

Additional Journal Information:: Journal Volume: 104; Journal Issue: 11; Journal ID: ISSN 0003-004X

Publisher:: Mineralogical Society of America

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Topaz; High-pressure; Cr3+luminescence; nesosilicates

Citation Formats


                    O'Bannon, III, Earl F., and Williams, Quentin. A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa.  United States: N. p., 2019. 
Web.  doi:10.2138/am-2019-7079.

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                    O'Bannon, III, Earl F., & Williams, Quentin. A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa.  United States.  https://doi.org/10.2138/am-2019-7079

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                    O'Bannon, III, Earl F., and Williams, Quentin. Fri .  
"A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa".  United States.  https://doi.org/10.2138/am-2019-7079.  https://www.osti.gov/servlets/purl/1573158.

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@article{osti_1573158,

  title        = {A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa},

  author       = {O'Bannon, III, Earl F. and Williams, Quentin},

  abstractNote = {Topaz [Al2SiO4(F,OH)2] is a subduction-related mineral that is found in metasediments and has a large pressure and temperature stability field. Here, we use luminescence spectroscopy of Cr3+ to probe the Al site in topaz at pressures up to ~60 GPa, which corresponds to a depth of ~1400 km in the Earth. This technique allows us to probe all three unique Al environments (i.e., [AlO4(OH)2]7–, [AlO4(F)2]7–, and [AlO4OH,F]7–) simultaneously under high pressure. We find that the R-line luminescence from all three Al environments shift linearly to longer wavelength to ~40 GPa. Above ~40 GPa, they shift nonlinearly and begin to flatten out at ~48 GPa, with a pressure shift of ~0 cm–1/GPa from ~48–55 GPa. Our results, combined with previous high-pressure single-crystal X-ray diffraction studies to ~45 GPa, strongly indicate that there is a change in the compression mechanism in topaz above ~40 GPa. Furthermore, our high-pressure room-temperature results show that the metastable persistence of topaz on compression represents one of the most extreme cases among tetrahedrally coordinated silicates.},

  doi          = {10.2138/am-2019-7079},

  journal      = {American Mineralogist},

  number       = 11,

  volume       = 104,

  place        = {United States},

  year         = {Fri Nov 01 00:00:00 EDT 2019},

  month        = {Fri Nov 01 00:00:00 EDT 2019}

}

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Title: A Cr3+ luminescence study of natural topaz Al2SiO4(F,OH)2 up to 60 GPa

Abstract

Citation Formats

Title: A Cr³⁺ luminescence study of natural topaz Al₂SiO₄(F,OH)₂ up to 60 GPa