title: Study of luminescence, color and paramagnetic centers properties of albite.
abstract: A sample of natural albite, NaAlSi3O8, from the state of Minas Gerais, Brazil, has been investigated. The mineral is a solid solution of K-feldspar (4600 ppm--K) and Ca-feldspar (1100 ppm--Ca). The TL spectra of natural and the pre-annealed at high temperature albite presented a very intense band around 275 nm and weaker bands around 400 and 560 nm. Other TL properties have been investigated through monochromatic (275 nm and 400 nm) glow curves. The EPR spectrum measured at low temperature (77K) shows the typical 11 lines signal due to Al-O(-)-Al center superposed on Fe(3+) signal around g=2.0. The EPR spectra above 260 K show only g=2.0 signal due to Fe(3+) ions.
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, São Paulo, SP, Brazil; Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Alm. Saldanha da Gama, 89, CEP 11030-400, Santos, SP, Brazil. Electronic address: nilo.cano@unifesp.br.
authors.forename: Nilo F
authors.initials: NF
authors.lastname: Cano
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, São Paulo, SP, Brazil.
authors.forename: Lara H E
authors.initials: LH
authors.lastname: dos Santos
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, São Paulo, SP, Brazil.
authors.forename: Jose F D
authors.initials: JF
authors.lastname: Chubaci
authors.affiliation: Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, São Paulo, SP, Brazil.
authors.forename: Shigueo
authors.initials: S
authors.lastname: Watanabe
mesh_terms: D000535:Aluminum / Q000737:chemistry; D001938:Brazil; D003116:Color; D004578:Electron Spin Resonance Spectroscopy; D005720:Gamma Rays; D049449:Luminescence; D008903:Minerals / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D008903:Minerals; D000535:Aluminum
keywords: Albite; EPR; Optical absorption; Silicates; Thermoluminescence