Hostname: page-component-848d4c4894-2pzkn Total loading time: 0 Render date: 2024-04-30T21:53:15.671Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Adsorbed Iron on Thermoluminescence and Electron Spin Resonance Spectra of Ca-Fe-Exchanged Montmorillonite

Published online by Cambridge University Press:  02 April 2024

Lelia M. Coyne  and
Amos Banin
Lelia M. Coyne
Affiliation:
Department of Chemistry, San Jose State University, San Jose, California 95192 NASA-Ames Research Center, Mail Stop 239-4, Moffett Field, California 94035
Amos Banin
Affiliation:
Seagram Center for Soil and Water Sciences, The Hebrew University, Rehovot, Israel Department of Chemistry, San Francisco State University, San Francisco, California 94132
Get access Rights & Permissions [Opens in a new window]

Abstract

The electron spin resonance (ESR) spectra and the natural and gamma-induced thermoluminescence (TL) glow curves of a series of variably cation-exchanged Fe-Ca-clays prepared from SWy-1 montmorillonite were examined. The ESR signal (g = 2) intensity associated with the surface Fe was found to increase linearly with surface Fe content up to a nominal concentration of 50% exchangeable Fe. At > 50% exchangeable Fe, no appreciable increase in the signal was noted. The TL intensity decreased linearly with increasing surface Fe up to 50% nominal exchangeable Fe. At > 50%, the signal was not appreciably further diminished. The natural TL showed only a high-temperature peak, but irradiation produced an additional low-temperature peak. One month after gamma-irradiation, the integrated TL signal was still 10–100 times higher than that from the non-irradiated material. Thus, (1) surface iron clusters may form above a certain critical Fe concentration; (2) the Fe clusters are probably less effective in quenching TL than are single Fe atoms, implying interaction between surface Fe and the stored energy content of the material; and (3) the electronic energy stored in the material as the result of gamma-irradiation is only slowly dissipated.

Keywords

Electron spin resonanceIronMontmorilloniteSurface adsorptionThermoluminescence
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 6 , December 1986 , pp. 645 - 650
Copyright
Copyright © 1986, The Clay Minerals Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Aasa, R., 1970 Powder line shapes in the electron paramagnetic resonance spectra of high-spin ferric complexes J. Chem. Phys. 52 3919–3930.CrossRefGoogle Scholar
Angel, B. R., Jones, J. P. E. and Hall, P. L., 1974 Electron spin resonance studies of doped synthetic kaolinites I Clay Miner. 10 247–256.CrossRefGoogle Scholar
Banin, A., 1973 Quantitative ion exchange process for clay U.S. Patent .Google Scholar
Banin, A., Margulies, L. and Chen, Y., 1985 Iron mont-morillonite: A spectral analog of Martian soil J. Geophys. Res. 90 C771 774.Google Scholar
Bell, P. M., Mao, H. K., Rossman, G. R. and Karr, C., 1975 Absorption spectroscopy of ionic and molecular units in crystals and glasses Infrared and Raman Spectroscopy of Lunar and Terrestrial Minerals New York Academic Press 165–195.Google Scholar
Burns, R. G., 1970 Mineralogical Applications of Crystal Field Theory London Cambridge University Press.Google Scholar
Coyne, L. M., 1985 A possible energetic role of mineral surfaces in chemical evolution Origins of Life 15 161–207.Google ScholarPubMed
Coyne, L. M., Lahav, N. and Lawless, J., 1981 Dehydration-induced luminescence in clay minerals Nature 292 819–821.CrossRefGoogle Scholar
Coyne, L. M., Lawless, J. G., Lahav, N., Sutton, S., Sweeney, M. and Wolman, Y., 1981 Clays as prebiotic photocatalysts Origin of Life The Netherlands Reidel, Dordrecht 115–124.CrossRefGoogle Scholar
Coyne, L. M., Pollock, G. and Kloepping, R. J., 1984 Room temperature luminescence from kaolin-induced by organic amines Clays & Clay Minerals 32 58–67.CrossRefGoogle ScholarPubMed
Coyne, L. M., Sweeney, M. and Hovatter, W., 1983 Luminescence induced by dehydration of kaolin—association with electron spin resonance-active centers and with surface activity for dehydration-polymerization of glycine J. Luminescence 28 395–409.CrossRefGoogle Scholar
Geake, J. E., Walker, G., Mills, A. H. and Garlick, G. F. J., 1971 Luminescence of Apollo lunar samples Geochim. Cosmochim. Acta, supp. 2, Proc. 2nd Lunar Sci. Conf. Vol. 3 2265–2275.Google Scholar
Gerstl, Z. and Banin, A., 1980 Fe2+-Fe3+ transformations in clay and resin ion-exchange systems Clays & Clay Minerals 28 335–345.CrossRefGoogle Scholar
Hall, P. L., 1980 The application of electron spin resonance spectroscopy to studies of clay minerals: I. Isomor-phous substitutions and external surface properties Clay Miner. 15 321–335.CrossRefGoogle Scholar
Hall, P. L., 1980 The application of electron spin resonance spectroscopy to studies of clay minerals: II. Inter-lamellar complexes—structure, dynamics and reactions Clay Miner. 15 337–349.CrossRefGoogle Scholar
Jones, J. P. E., Angel, B. R. and Hall, P. L., 1974 Electron spin resonance studies of doped synthetic kaolinites II Clay Miner. 10 257–270.CrossRefGoogle Scholar
Kathrein, H., Freund, F. and Nagy, J., 1984 O− ions and their relation to traces of H2O and CO2 in magnesium oxide J. Phys. Chem. Solids 45 1155–1163.CrossRefGoogle Scholar
Komusinki, J., Stoch, L. and Dubiel, S. M., 1981 Application of electron paramagnetic resonance and Mössbauer spectroscopy in the investigation of kaolinite group minerals Clays & Clay Minerals 29 23–30.CrossRefGoogle Scholar
Lahav, N. and Coyne, L., 1985 Characterization of dehydration-induced luminescence in kaolinite Clays & Clay Minerals 33 207–213.CrossRefGoogle ScholarPubMed
Lahav, N., Coyne, L. M. and Lawless, J. G., 1982 Prolonged triboluminescence in clays and other minerals Clays & Clay Minerals 30 73–75.CrossRefGoogle Scholar
Lemons, K. W. and McAtee, J., 1983 The parameters of induced thermoluminescence of some selected phyllosili-cates: a crystal defect structure study Amer. Mineral. 63 915–923.Google Scholar
Levanon, H., Stein, C. and Luz, Z., 1968 The electron spin resonance spectrum of FeF6 3- in aqueous solutions J. Amer. Chem. Soc. 90 5292–5293.CrossRefGoogle Scholar
Leverenz, H. W., 1968 An Introduction to the Luminescence of Solids New York Dover.Google Scholar
Lohr, L. L. and McClure, D. S., 1968 Optical spectra of divalent manganese salts. II. The effect of interionic coupling on absorption strength J. Chem. Phys. 49 1316–1321.CrossRefGoogle Scholar
McBride, M. B., Mortland, M. M. and Pinnavaia, T. J., 1975 Perturbation of structural Fe3 in smectites by exchange ions Clays & Clay Minerals 23 103–107.CrossRefGoogle Scholar
McBride, M. B., Mortland, M. M. and Pinnavaia, T. J., 1975 Exchange ion positions in smectite: effect on electron spin resonance of structural iron Clays & Clay Minerals 23 162–164.CrossRefGoogle Scholar
Medlin, W. L. and McDougall, D. J., 1968 The nature of traps and emission centers in thermoluminescent rock materials Thermoluminescence of Geological Materials, Proc. NATO Adv. Res. Inst. New York Academic Press 193–225.Google Scholar
Nishita, H. and Hamilton, M., 1975 Empirical methods of using soils as radiation dosimeters Soil. Sci. 120 96–106.CrossRefGoogle Scholar
Pinnavaia, T. J., Van Olphen, H. and Fripiat, J. J., 1979 Electron spin resonance DataHand-book for Clay Materials and Other Non-Metallic Minerals Oxford Pergamon Press 339–342.Google Scholar
Pinnavaia, T. J. and Fripiat, J. J., 1981 Electron spin resonance studies of clay minerals Advanced Techniques for Clay Mineral Analysis Amsterdam Elsevier 139–161.Google Scholar
Seigel, F. R., Vaz, J. E., Ronca, L. B. and McDougall, D. J., 1968 Thermoluminescence of clay minerals Thermoluminescence of Geological Materials, Proc. NATO Adv. Res. Inst. London Academic Press 635–641.Google Scholar
Sherman, D. M., Burns, R. C. and Burns, V. M., 1982 Spectral characteristics of the iron oxides with application to the Martian bright region mineralogy J. Geophys. Res. 87 10,169 10,180.CrossRefGoogle Scholar
van Olphen, H. and Fripiat, J. J., eds. (1979) Data Handbook for Clays and Other Nonmetallic Materials, Pergamon Press, Oxford, 346 pp.Google Scholar