Abstract
Only very slight changes are observed in the29Si and27Al solid-sate magic-angle spinning NMR spectra of a montmorillonite containing almost equal numbers of octahedral aluminium and magnesium ions when its interlayer water is driven off by heating. The29Si NMR spectra are unaffected by dehydroxylation which begins at ∼ 450° C, but the27Al spectra show a decrease in total intensity, possibly due to the formation of 5-coordinated aluminium, with a slight increase in the intensity of the tetrahedral aluminium resonance. On the basis of these results, a structural model is proposed for the dehydroxylate phase and its formation mechanism is discussed. The destruction of the dehydroxylate X-ray pattern at ∼ 850° C and the subsequent recrystallization of the high-temperature products (β-quartz, enstatite and high-cordierite at ∼ 1100° C;β-cristobalite, enstatite and sapphirine at ∼ 1200° C) is accompanied by changes in the silicon and aluminium NMR spectra and in the57Fe Mbssbauer spectra which are fully consistent with the known structural features of these phases.
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References
R. E. Grim andW. F. Bradley,J. Amer. Ceram. Soc. 23 (1940) 242.
R. E. Grim andG. Kulbicki.Amer. Mineral. 46 (1961) 1329.
U. Hofmann, K. Endell andD. Wilm,Z. Krist. 86 (1933) 340.
C. H. Edelman andJ. Ch. L. Favejee,ibid. 102 (1940) 417.
W. F. Bradley andR. E. Grim,Amer. Mineral. 36 (1951) 182.
S. I. Tsipursky andV. A. Drits,Clay Min. 19 (1984) 177.
W. D. Johns andE. C. Johns,J. Geol. 62 (1954) 163.
L. Heller, V. C. Farmer, R. C. MacKenzie, B. D. Mitchell andH. F. W. Taylor,Clay Min. Bull. 5 (1962) 56.
R. Wardle andG. W. Brindley,Amer. Mineral. 57 (1972) 732.
K. J. D. MacKenzie, I. W. M. Brown, R. H. Meinhold andM. E. Bowden,J. Amer. Ceram. Soc. 68 (1985) 266.
L. Heller-Kallai andI. Rozenson,Clays Clay Mins 28 (1980) 355.
I. Rozenson andL. Heller-Kallai,ibid. 28 (1980) 391.
C. M. Cardile andJ. H. Johnston,ibid. 34 (1986) 307.
K. J. D. MacKenzie, I. W. M. Brown, R. H. Meinhold andM. E. Bowden,J. Amer. Ceram. Soc. 68 (1985) 293.
C. S. Ross andS. B. Hendricks, US Geological Survey Professional Paper 205-B (1945) 23–79.
R. Greene-Kelly, in “The Differential Thermal Investigation of Clays”, edited by R. C. MacKenzie (Mineralogical Society, London, 1957) pp. 140–64.
D. McConnell,Amer. Mineral. 35 (1950) 166.
R. H. Meinhold, K. J. D. MacKenzie andI. W. M. Brown,J. Mater. Sci. Lett. 4 (1985) 163.
T. Watanabe, H. Shimizu. A. Masuda andH. Saito,Chem. Lett. (1983) 1293.
K. A. Smith, R. J. Kirkpatrick, E. Oldfield andD. M. Henderson,Amer. Mineral. 68 (1983) 1206.
J. G. Thompson,Clay Min. 19 (1984) 229.
A. Putnis, C. A. Fyfe andG. C. Gobbi,Phys. Chem. Minerals 12 (1985) 211.
S. Motherwell, “PLUTO, A Programme for Plotting Molecular and Crystal Structures” (University Chemical Library, Cambridge, England, 1976).
B. A. Goodman andJ. W. Stucki,Clay Min. 19 (1984) 663.
P. B. Moore,Amer. Mineral. 54 (1969) 31.
S. Merlino,Z. Krist. 151 (1980) 91.
U. Halenius,Can. Mineral. 16 (1978) 567.
E. Kreber, U. Gonser, A. Trautwein andF. E. Harris,J. Phys. Chem. Solids 36 (1975) 263.
G. M. Bancroft, R. G. Burns andA. J. Stone,Geochim. Cosmochim. Acta 32 (1968) 547.
K. J. D. MacKenzie andM. E. Bowden,Thermochim. Acta 64 (1983) 83.
T. V. Malysheva andA. V. Ukhanov,Geochim. Int. 13 (1976) 96.
R. G. Gupta andR. G. Mendiratta,Mineralog. Mag. 43 (1980) 815.
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Brown, I.W.M., MacKenzie, K.J.D. & Meinhold, R.H. The thermal reactions of montmorillonite studied by high-resolution solid-state29Si and27Al NMR. J Mater Sci 22, 3265–3275 (1987). https://doi.org/10.1007/BF01161191
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DOI: https://doi.org/10.1007/BF01161191