English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/3218
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 12 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : Analysis of luminescence spectra of leucite (KAlSiO4)
Autor : García-Guinea, Javier ; Correcher, Virgilio; Rodríguez Badiola, Eduardo
Palabras clave : radioluminescence
Campania Vessa
Fecha de publicación : 2001
Editor: Royal Society of Chemistry (Great Britain)
Citación : The ANALYST
Serie : 126
Resumen: High-sensitivity radioluminescence (RL) and thermoluminescence (TL) measurements were carried out on samples of natural leucite (with 2.95% of Na2O) from Campania Vessa (Italy). Samples were annealed to modify the charge compensation through alkali metal self-diffusion and to produce luminescence centres. High-temperature powder diffraction, scanning electron microscopy and chemical analyses were performed to monitor the tetragonal–cubic phase transitions and the thermal drainage of alkali metal ions from the aluminosilicate lattice. The emission spectral bands of leucite (300, 380, 430, 480, 560 and 680 nm) match those of other Na/K-aluminosilicates (alkali metal feldspars) and could be attributed to similar defects. TL glow curves of increasingly pre-irradiated natural leucite (range 0–20 Gy) showed no changes above 300 °C, whereas some changes were observed with annealed samples (1000 °C for 12 h). This temperature is the starting point of Na self-diffusion within the aluminosilicate lattices. The areas of the TL glow curves of both natural and annealed ß-irradiated leucites can be fitted with a linear function with high correlation. These results are in agreement with high alkali metal loss (K2O 12% and Na2O 18%) during thermal pre-treatment, high cell volume expansion (from 2350 to 2500 Å) and the cubic Ia3d↔tetragonal I41/a phase transition. This promotes the egress of alkali metal ions and the production of [AlO4/M+]°, [AlO4/H+]° and [AlO4]° luminescence centres.
Descripción : We are grateful to Professor P. D. Townsend for the guidelines for the experiments and Dr. M. L. Clarke for recording the RL measurements using the high-sensitivity TL spectrometer at the University of Sussex. Thanks are due to Eladio Vila for the high-temperature X-ray measurements and Paul Giblin for a critical review of the manuscript.
URI : http://hdl.handle.net/10261/3218
DOI: 10.1039/b101869h
Aparece en las colecciones: (MNCN) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Analyst, 2001, 126, 911-916.pdf326,49 kBAdobe PDFVista previa
Analyst Articles.mht110,92 kBmhtVisualizar/Abrir
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.