Ardit, M., Cruciani, G., Dondi, M., Garbarino, G. L., Nestola, F. (2014) Phase transitions during compression of thaumasite, Ca3Si(OH)6(CO3)(SO4)·12H2O: A high-pressure synchrotron powder X-ray diffraction study. Mineralogical Magazine, 78 (5) 1193-1208 doi:10.1180/minmag.2014.078.5.07
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Phase transitions during compression of thaumasite, Ca3Si(OH)6(CO3)(SO4)·12H2O: A high-pressure synchrotron powder X-ray diffraction study | ||
| Journal | Mineralogical Magazine | ||
| Authors | Ardit, M. | Author | |
| Cruciani, G. | Author | ||
| Dondi, M. | Author | ||
| Garbarino, G. L. | Author | ||
| Nestola, F. | Author | ||
| Year | 2014 (October) | Volume | 78 |
| Page(s) | 1193-1208 | Issue | 5 |
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2014.078.5.07Search in ResearchGate | ||
| Mindat Ref. ID | 244559 | Long-form Identifier | mindat:1:5:244559:9 |
| GUID | d17687de-83e5-4da6-a68f-620af3540e0b | ||
| Full Reference | Ardit, M., Cruciani, G., Dondi, M., Garbarino, G. L., Nestola, F. (2014) Phase transitions during compression of thaumasite, Ca3Si(OH)6(CO3)(SO4)·12H2O: A high-pressure synchrotron powder X-ray diffraction study. Mineralogical Magazine, 78 (5) 1193-1208 doi:10.1180/minmag.2014.078.5.07 | ||
| Plain Text | Ardit, M., Cruciani, G., Dondi, M., Garbarino, G. L., Nestola, F. (2014) Phase transitions during compression of thaumasite, Ca3Si(OH)6(CO3)(SO4)·12H2O: A high-pressure synchrotron powder X-ray diffraction study. Mineralogical Magazine, 78 (5) 1193-1208 doi:10.1180/minmag.2014.078.5.07 | ||
| Abstract/Notes | AbstractThe high-pressure behaviour of the thaumasite structure was investigated using synchrotron powder X-ray diffraction, up to 19.5 GPa. Based on Rietveld refinements, thaumasite retained the roompressure P63space group throughout the whole investigated pressure range while the pressure dependence of the refined unit-cell parameters can be cast into three different compression regimes, each corresponding to a different thaumasite phase (th-I, th-II and th-III) related by isosymmetric phase transitions. In particular, the phase transition in the 7.40–15.02 GPa P-range (i.e. from th-II to th-III) is associated with an inversion of the axial bulk moduli which, by analogy with ettringite, can be rationalized as due to a change in the relative strengths of the iono-covalent bonds along the [Ca3Si(OH)6(H2O)12]4+columns parallel to the c axis vs. the O–H bonds linking the columns within the ab plane. The linear inverse relationship between the low- and high-temperature data from the literature with those collected under high-pressure conditions reveals that the same bonding regime governs the anisotropic expansion and contraction of thaumasite up to ~1.4 GPa and 400 K (HP-HT stability limits of th-I phase). | ||
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