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Stability of KAlSi3O8 hollandite-type structure in the earth's lower mantle conditions

Tutti, F.; Dubrovinsky, L. S.; Saxena, S. K. and Carlson, S. LU (2001) In Geophysical Research Letters 28(14). p.2735-2738
Abstract

The stability of KAISi3O8 hollandite-type structure is investigated in a series of synthesis experiments between 20 and 95 GPa at 650(±50) °C and between 1200 to 2300 °C, using electrically- and laser-heated diamond anvil cells, respectively. Potassium feldspar transformed to a hollandite-type structure in the experimental pressure range from 20 to 95 GPa at temperatures between 1200 to 2300 °C, whereas it remained amorphous at 65(±5) GPa and 650(±50) °C. KAISi3O8 hollandite is, therefore, a stable phase under the pressure and temperature conditions of at least 2200 km deep in the lower mantle and could be an important host for potassium in that region.

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author
organization
publishing date
type
Contribution to journal
publication status
published
in
Geophysical Research Letters
volume
28
issue
14
pages
4 pages
publisher
American Geophysical Union
external identifiers
  • Scopus:0035878280
ISSN
0094-8276
DOI
10.1029/2000GL012786
language
English
LU publication?
yes
id
2baa230b-9d2f-4cb3-b917-bc5190d6d25f
date added to LUP
2016-05-04 11:57:16
date last changed
2017-01-01 08:24:39
@article{2baa230b-9d2f-4cb3-b917-bc5190d6d25f,
  abstract     = {<p>The stability of KAISi<sub>3</sub>O<sub>8</sub> hollandite-type structure is investigated in a series of synthesis experiments between 20 and 95 GPa at 650(±50) °C and between 1200 to 2300 °C, using electrically- and laser-heated diamond anvil cells, respectively. Potassium feldspar transformed to a hollandite-type structure in the experimental pressure range from 20 to 95 GPa at temperatures between 1200 to 2300 °C, whereas it remained amorphous at 65(±5) GPa and 650(±50) °C. KAISi<sub>3</sub>O<sub>8</sub> hollandite is, therefore, a stable phase under the pressure and temperature conditions of at least 2200 km deep in the lower mantle and could be an important host for potassium in that region.</p>},
  author       = {Tutti, F. and Dubrovinsky, L. S. and Saxena, S. K. and Carlson, S.},
  issn         = {0094-8276},
  language     = {eng},
  month        = {07},
  number       = {14},
  pages        = {2735--2738},
  publisher    = {American Geophysical Union},
  series       = {Geophysical Research Letters},
  title        = {Stability of KAlSi<sub>3</sub>O<sub>8</sub> hollandite-type structure in the earth's lower mantle conditions},
  url          = {http://dx.doi.org/10.1029/2000GL012786},
  volume       = {28},
  year         = {2001},
}