AIP Conf. Proc. / Volume 1163 / Issue 1 PRINT PAGE

Variation of Spectra Luminescence Emission of Moganite under Different Stimulation Sources AIP Conf. Proc. -- August 17, 2009 -- Volume 1163, pp. 109-114 MICRO-RAMAN SPECTROSCOPY AND LUMINESCENCE STUDIES IN THE EARTH AND PLANETARY SCIENCES: Proceedings of the International Conference Spectroscopy 2009; doi:10.1063/1.3222875 Issue Date: 17 August 2009

J. Garcia-Guinea,a M. A. Bustillo,a E. Crespo-Feo,a L. Tormo,a A. A. Finch,b D. E. Hole,c P. D. Townsend,c and V. Correcherd aMuseo Nacional Ciencias Naturales, (CSIC) Jose Gutierrez Abascal 2, Madrid 28006, Spain bCentre for Advanced Materials, University St Andrews, Irvine Building, St Andrews, Fife, KY16 9AL, UK cScience and Technology, University of Sussex, Brighton, BN1 9QH, UK dCIEMAT. Av. Complutense 22, Madrid 28040, Spain

This work focuses on a characterization of various type of luminescence in Moganite-rich silica minerals from Mogan (Gran Canaria, Spain). The silica minerals formed by complicated hydrous processes exhibit luminescence emissions, which depend on sample temperature and type of an irradiation for excitation such as heat, laser, ion-beam, X-ray, incident electron beam and so on. Here we examined thermoluminescence (TL), ion beam luminescence (IBL), radioluminescence (RL), cathodoluminescence (CL) of moganite aliquots

combined with Raman spectroscopy for clarification of relationship between lattice defects and the spectral luminescence emissions. The spatially-resolved CL spectroscopy coupled to the environmental scanning electron microscopy (ESEM-CL) displays different luminescence spectral signals between the moganite veined core (dull emission) and the rim (bright emission) together with larger porosity and additional ions in the outer part, suggesting a later alteration process with alkali, metals and volatile ions for the moganite

formation. RL and IBL spectra of silica minerals in core and rim mainly show a progressive increase in intensity of RL emission band at 470–500 nm with decrease in sample temperature, which is caused by cryogenic stress on the [AlO4]0 centers. Continuous H+ ion beam implantation on samples at room

temperature produces a subtle diminishing of blue emission and a quite brightening of red emission at 700 nm assigned to Fe3+ point defects. The white turbid rim with opaline SiO2

in cavities emits bright CL emission

in panchromatic CL image, and has spectral emission bands at 290 nm with high intensity (100 000 a.u.) and one at 520 nm which are probably related to H2O(Si-OH) groups, H+, Na+ and metallic ions such as Fe3+,

Ti4+ and Nb4+. Moganite core zones only display emission bands at 390 nm and 670 nm (8500 a.u.) attributed to [AlO4/Na+]0 centers and silanol groups, respectively. ©2009 American Institute of Physics

Permalink: http://link.aip.org/link/?APCPCS/1163/109/1

KEYWORDS and PACS

cathodoluminescence, photoluminescence, thermoluminescence, scanning electron microscopy

78.60.Hk Cathodoluminescence, ionoluminescence (condensed matter) 78.55.Fv Photoluminescence in solid alkali halides 78.60.Kn Thermoluminescence (condensed matter) 68.37.Hk Scanning electron microscopy (SEM) of surfaces, interfaces and thin films YEAR: 2009

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