Tuning dielectric and nonohmic properties of CaCu3Ti4O12 ceramics with W doping.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorMoreno, H.-
Autor(es): dc.creatorTeixeira, Veronica de Carvalho-
Autor(es): dc.creatorPonce, M. A.-
Autor(es): dc.creatorMacchi, C. E.-
Autor(es): dc.creatorAldao, C. M.-
Autor(es): dc.creatorBezzon, Vinícius Danilo Nonato-
Autor(es): dc.creatorSimões, A. Z.-
Autor(es): dc.creatorRamirez, M. A.-
Data de aceite: dc.date.accessioned2026-08-11T11:23:28Z-
Data de disponibilização: dc.date.available2026-08-11T11:23:28Z-
Data de envio: dc.date.issued2025-08-22-
Data de envio: dc.date.issued2024-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/20868-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0025540825002016-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.materresbull.2025.113493-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1187763-
Descrição: dc.descriptionThis study investigates the dielectric and nonohmic properties of the CaCu3Ti4O12: x % W (x = 0.00, 0.02, 0.010, 2.50, 5.00) denoted as CCTO, W002, W010, W250, and W500, respectively. X-ray diffraction analysis confirmed a pseudo-cubic perovskite phase (Im-3 space group) for samples, and a CaCu3Ti4O12/CaWO4/TiO2 composite system for high W content (W250, W500), supported by energy dispersive spectroscopy (EDS) and X-ray fluo- rescence (XRF) measurements. Positron annihilation lifetime spectroscopy identified Vʹʹ Cu/Vʹʹ Ca vacancies as the main defects induced by W incorporation, influencing charge carrier mobility at grain boundaries, thus affecting sintering, grain size, and morphology. Lower W content (W002) resulted in a high dielectric response (ε~1.2 × 104 ) with improved tanδ (0.02). Conversely, W250 exhibited higher nonlinear coefficient (α~38), with low leakage current (IL~14.6 μA/cm2 ) and breakdown voltage (Eb~198 V. cm− 1 ). This solid-state synthesis method provides a way to customize TiO2/CaWO4-doped CCTO matrices, showcasing promising varistor characteristics that are well-suited for hybrid capacitor-varistor devices and related applications.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectDielectric response-
Palavras-chave: dc.subjectVaristor behavior-
Palavras-chave: dc.subjectDefects-
Título: dc.titleTuning dielectric and nonohmic properties of CaCu3Ti4O12 ceramics with W doping.-
Aparece nas coleções:Repositório Institucional - UFOP

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