Radioluminescence study of calcium tungstate crystalline powders and ceramics
Source abstract
Abstract
Abstract 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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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Nuclear materials and radiation effects · Glass properties and applications
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Affiliations
Coordenação de Física Instituto Federal de Educação, Ciência e Tecnologia do Sertão Pernambucano Salgueiro PE Brazil
Grupo de Materiais Cerâmicos Avançados Departamento de Física Universidade Federal de Sergipe São Cristovão SE Brazil
Funding
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior · Fundação de Apoio à Pesquisa e à Inovação Tecnológica do Estado de Sergipe · Conselho Nacional de Desenvolvimento Científico e Tecnológico · FAPITEC
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