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Kleppe, A. K., Welch, M. D., Crichton, W. A., Jephcoat, A. P. (2012) Phase transitions in hydroxide perovskites: a Raman spectroscopic study of stottite, FeGe(OH)6, to 21 GPa. Mineralogical Magazine, 76 (4) 949-962 doi:10.1180/minmag.2012.076.4.11

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Reference TypeJournal (article/letter/editorial)
TitlePhase transitions in hydroxide perovskites: a Raman spectroscopic study of stottite, FeGe(OH)6, to 21 GPa
JournalMineralogical Magazine
AuthorsKleppe, A. K.Author
Welch, M. D.Author
Crichton, W. A.Author
Jephcoat, A. P.Author
Year2012 (August)Volume76
Issue4
PublisherMineralogical Society
DOIdoi:10.1180/minmag.2012.076.4.11Search in ResearchGate
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Mindat Ref. ID244265Long-form Identifiermindat:1:5:244265:9
GUID0
Full ReferenceKleppe, A. K., Welch, M. D., Crichton, W. A., Jephcoat, A. P. (2012) Phase transitions in hydroxide perovskites: a Raman spectroscopic study of stottite, FeGe(OH)6, to 21 GPa. Mineralogical Magazine, 76 (4) 949-962 doi:10.1180/minmag.2012.076.4.11
Plain TextKleppe, A. K., Welch, M. D., Crichton, W. A., Jephcoat, A. P. (2012) Phase transitions in hydroxide perovskites: a Raman spectroscopic study of stottite, FeGe(OH)6, to 21 GPa. Mineralogical Magazine, 76 (4) 949-962 doi:10.1180/minmag.2012.076.4.11
Abstract/NotesAbstractThe effect of pressure on the naturally occurring hydroxide-perovskite stottite, FeGe(OH)6, has been studied in situ by micro-Raman spectroscopy to 21 GPa at 300 K. The ambient spectrum contains six OH-stretching bands in the range 3064 3352 cm–1. The presence of six non-equivalent OH groups is inconsistent with space group P42/n. In view of this inconsistency a new ambient structure determination of stottite from Tsumeb was carried out, but this did not allow the clear rejection of P42/n symmetry. However, a successful refinement was also carried out in space group P2/n, a subgroup of P42/n, which allows for six non-equivalent O atoms. The two refinements are of comparable quality and do not allow a choice to be made based purely on the X-ray data. However, taken with the ambient and 150 K Raman spectra, a good case can be made for stottite having P2/n symmetry at ambient conditions. On this basis, the pressure induced spectroscopic changes are interpreted in terms of a reversible phase transition P2/n ↔ P42/n.

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Stottite

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Kleppe, A. K., Jephcoat, A. P. (2004) High-pressure Raman spectroscopic studies of FeS2 pyrite. Mineralogical Magazine, 68 (3) 433-441 doi:10.1180/0026461046830196
Welch, M. D., Crichton, W. A. (2002) Compressibility to 7 GPa at 298 K of the protonated octahedral framework mineral burtite, CaSn(OH)6. Mineralogical Magazine, 66 (3) 431-440 doi:10.1180/0026461026630039
Crichton, W. A., Parise, J. B., Müller, H., Breger, J., Marshall, W. G., Welch, M. D. (2012) Synthesis and structure of magnesium hydroxide fluoride, Mg(OH)F: a topological intermediate between brucite- and rutile-type structures. Mineralogical Magazine, 76 (1) 25-36 doi:10.1180/minmag.2012.076.1.25
Kleppe, Annette K., Jephcoat, Andrew P., Welch, Mark D. (2003) The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa. American Mineralogist, 88 (4) 567-573 doi:10.2138/am-2003-0410
Welch, M. D., Crichton, W. A., Ross, N. L. (2005) Compression of the perovskite-related mineral bernalite Fe(OH)3 to 9 GPa and a reappraisal of its structure. Mineralogical Magazine, 69 (3) 309-315 doi:10.1180/0026461056930252
Crichton, W. A., Merlini, M., Müller, H., Chantel, J., Hanfland, M. (2012) The high-pressure monazite-to-scheelite transformation in CaSeO4. Mineralogical Magazine, 76 (4) 913-923 doi:10.1180/minmag.2012.076.4.08
Kleppe, A. K., Jephcoat, A. P., Smyth, J. R. (2002) Raman spectroscopic study of hydrous γ -Mg 2 SiO 4 to 56.5 GPa. Physics and Chemistry of Minerals, 29 (7) 473-476 doi:10.1007/s00269-002-0255-5
Kleppe, A. K., Welch, M. D., Wright, K. (2005) Preface to the special issue: 'Protons in Minerals'. Mineralogical Magazine, 69 (3) 227-228 doi:10.1180/s0026461x0003005x
Kleppe, A. K., Jephcoat, A. P., Olijnyk, H., Slesinger, A. E., Kohn, S. C., Wood, B. J. (2001) Raman spectroscopic study of hydrous wadsleyite (β-Mg 2 SiO 4 ) to 50 GPa. Physics and Chemistry of Minerals, 28 (4) 232-241 doi:10.1007/s002690100152
Nestola, F., Pasqual, D., Welch, M. D., Oberti, R. (2012) The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole. Mineralogical Magazine, 76 (4) 987-995 doi:10.1180/minmag.2012.076.4.14
Kleppe, Annette K., Jephcoat, Andrew P., Ross, Nancy L. (2001) Raman spectroscopic studies of phase E to 19 GPa. American Mineralogist, 86 (10) 1275-1281 doi:10.2138/am-2001-1015
 
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