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Radioluminescence study of calcium tungstate crystalline powders and ceramics
Author(s) -
Carvalho Emanoel,
Soares Victor,
Leães Cristiane Ayala,
Paiva Getulio Eduardo,
Silva Ronaldo,
Silva Marcelo
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12686
Subject(s) - radioluminescence , materials science , tungstate , differential thermal analysis , analytical chemistry (journal) , thermogravimetric analysis , crystallite , calcination , ceramic , powder diffraction , absorption (acoustics) , absorption spectroscopy , diffraction , crystallography , optics , chemical engineering , composite material , metallurgy , biochemistry , chemistry , physics , chromatography , detector , engineering , catalysis , scintillation
In this paper, the optical absorption and radioluminescence ( RL ) of polycrystalline ceramic and powder Ca WO 4 are studied. The samples were synthesized via a solid‐state method. Differential thermal analysis and thermogravimetric ( DTA / TG ) measurements indicate a minimum temperature of 700°C for calcination of precursors. The crystalline phase of the samples of calcium tungstate was investigated by X‐ray diffraction ( XRD ). The RL of the crystal powder and ceramics are in agreement with that present in the literature for bulk single crystals, presenting a single emission band centered at 420 nm when irradiated with β‐rays. UV ‐vis absorption spectroscopy shows that the maximum absorption band of the Ca WO 4 sample is at around 400 nm, indicating the presence of mixed valence states of W 5+ and W 6+ , associated with a possible breaking of structural symmetry caused by WO 4 tetrahedral distortion.
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