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
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Phase transitions in hydroxide perovskites: a Raman spectroscopic study of stottite, FeGe(OH)6, to 21 GPa | ||
| Journal | Mineralogical Magazine | ||
| Authors | Kleppe, A. K. | Author | |
| Welch, M. D. | Author | ||
| Crichton, W. A. | Author | ||
| Jephcoat, A. P. | Author | ||
| Year | 2012 (August) | Volume | 76 |
| Page(s) | 949-962 | Issue | 4 |
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2012.076.4.11Search in ResearchGate | ||
| Mindat Ref. ID | 244265 | Long-form Identifier | mindat:1:5:244265:9 |
| GUID | 2378da91-cf2c-45eb-adca-cc7d886ca846 | ||
| Full Reference | 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 | ||
| Plain Text | 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 | ||
| Abstract/Notes | AbstractThe 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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