title: Thermo- and cathodoluminescence properties of lepidolite.
abstract: Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, and many of the related phyllosilicate mineral of the mica group have been well studied from the chemical and structural point of view; however, to the best of our knowledge, studies on their luminescence properties have been scarcely reported. This work focuses on the thermoluminescence (TL) and cathodoluminescence (CL) response of a natural lepidolite from Portugal previously characterized by means of environmental scanning electron microscope (ESEM) and X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS) techniques. The complexity of the thermoluminescence glow curves of non-irradiated and 1 Gy irradiated samples suggests a structure of a continuous trap distribution involving multiorder kinetics. UV-IR CL spectral emission shows seven peaks centered at 330, 397, 441, 489, 563, 700, and 769 nm. Such emission bands could be due to (i) structural defects, i.e., [AlO4] or non-bridging oxygen hole centers and (ii) the presence of point defects associated with Mn(2+) and Fe(3+).
authors.affiliation: CSIC, Instituto de Estructura de la Materia, Serrano 121, Madrid 28006, Spain. fermi2000@yahoo.com
authors.forename: Y
authors.initials: Y
authors.lastname: Rodríguez-Lazcano
authors.forename: V
authors.initials: V
authors.lastname: Correcher
authors.forename: J
authors.initials: J
authors.lastname: Garcia-Guinea
mesh_terms: D004566:Electrodes; D049449:Luminescence; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature
chemical_list: D008903:Minerals; D017640:Silicates
keywords: Cathodoluminescence; Lepidolite; Thermoluminescence