| Reference Type | Journal (article/letter/editorial) |
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| Title | The development of crystalline structure in aluminium hydroxide polymorphs on ageing |
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| Journal | Mineralogical Magazine |
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| Authors | Elderfield, H. | Author |
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| Hem, J. D. | Author |
| Year | 1973 (March) | Volume | 39 |
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| Issue | 301 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_39/39-301-89.pdf+ |
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| DOI | doi:10.1180/minmag.1973.039.301.14Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6643 | Long-form Identifier | mindat:1:5:6643:7 |
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| GUID | 0 |
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| Full Reference | Elderfield, H., Hem, J. D. (1973) The development of crystalline structure in aluminium hydroxide polymorphs on ageing. Mineralogical Magazine, 39 (301) 89-96 doi:10.1180/minmag.1973.039.301.14 |
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| Plain Text | Elderfield, H., Hem, J. D. (1973) The development of crystalline structure in aluminium hydroxide polymorphs on ageing. Mineralogical Magazine, 39 (301) 89-96 doi:10.1180/minmag.1973.039.301.14 |
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| In | (1973, March) Mineralogical Magazine Vol. 39 (301) Mineralogical Society |
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| Abstract/Notes | SummaryInfrared absorption spectra of the precipitated solids separated from aluminium-hydroxide solutions below the pH of minimum solubility of Al(OH)3 demonstrate the slow ageing of polymeric Al complexes to gibbsite. On comparison with the spectra of natural gibbsites, shifts in absorption frequency during crystal growth are interpreted in terms of changes in hydrogen bonding as a consequence of deprotonation and stacking of aluminium hydroxide layers to form gibbsite. In alkaline solutions the bayerite polymorph precipitates and IR frequencies are compatible with protonation as aluminate ions associate with the bayerite crystal having a lower crystal energy than its low pH polymorph. The infrared spectrum of nordstrandite, which is probably the stable polymorph in alkaline solution, shows evidence of strongly polarized hydroxyl ions similar to gibbsite. |
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