| Reference Type | Journal (article/letter/editorial) |
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| Title | An X-ray investigation of the thermal decomposition of portlandite |
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| Journal | Mineralogical Magazine |
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| Authors | Brett, N. H. | Author |
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| Year | 1969 (June) | Volume | 37 |
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| Issue | 286 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_37/37-286-244.pdf+ |
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| DOI | doi:10.1180/minmag.1969.037.286.13Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6262 | Long-form Identifier | mindat:1:5:6262:0 |
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| GUID | 0 |
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| Full Reference | Brett, N. H. (1969) An X-ray investigation of the thermal decomposition of portlandite. Mineralogical Magazine, 37 (286) 244-249 doi:10.1180/minmag.1969.037.286.13 |
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| Plain Text | Brett, N. H. (1969) An X-ray investigation of the thermal decomposition of portlandite. Mineralogical Magazine, 37 (286) 244-249 doi:10.1180/minmag.1969.037.286.13 |
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| In | (1969, June) Mineralogical Magazine Vol. 37 (286) Mineralogical Society |
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| Abstract/Notes | SummaryThe thermal decomposition of portlandite, Ca(OH)2, has been studied in air and in vacuum using X-ray single-crystal techniques. In air, the crystals were decomposed in situ on the goniometer arcs whilst X-ray reflections were simultaneously recorded. The transformation to CaO was not accompanied by topotaxy; this is attributed to the high nucleation rate of CaO crystallites in air. When Ca(OH)2 single crystals were decomposed under vacuum (and subsequently exposed to X-rays), some orientation of the CaO crystallites occurred. These results are compared with those of previous workers using electron-diffraction techniques. Decomposition of Ca(OH)2 single crystals commences at ∼ 450 °C in air and at ∼ 230 °C in a vacuum of 10−6 mmHg; reaction commences at crystal edges and surface defects, the reaction boundary moving inwards to the centre of the crystal. This observation is consistent with a homogeneous mechanism of decomposition. |
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