Energy storage enhancement and bandgap narrowing of lanthanum and sodium co-substituted BaTiO3 ceramics

Autor(es)

Alkathy, Mahmoud S. ^[1] ; Eiras, J. A. ^[1] ; Raju, K. C. James ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Phys Dept, Sao Carlos - Brazil

^[2] Univ Hyderabad, Sch Phys, Hyderabad - India

• Tipo de documento: Artigo Científico
• Fonte: Ferroelectrics; v. 570, n. 1, p. 153-161, JAN 2 2021.
• Citações Web of Science: 0

Resumo

A novel lead-free Ba(1-x)(La,Na)(x)TiO3 (BLNT), (0 <= x <= 0.08) ferroelectric ceramic with enhanced energy storage density was fabricated by the conventional solid-state method. With an increase in La3+/Na+ content, the energy storage density, efficiency and power density were increased. The samples with (x = 0.08) show recoverable energy storage of (1.07 J/cm3), 3 times higher than that of pure BaTiO3 ceramics, energy storage efficiency of (87.6%) and power density of 0.314 MW/cm(3), 17 times greater than that of pure BaTiO3 ceramics. Comparison with other lead-free ferroelectric ceramics confirmed the superiority potential of (BLNT-0.08) ceramics for the design of ceramics capacitors for energy storage applications. The effect of La3+/Na+ contents on the optical properties of BaTiO3 ceramics was studied via UV spectroscopy. The results revealed that the introduction of structure disorder by means of A-site vacancies leading to the creation of shallow defects resulting in narrowing the bandgap energy. This work may provide a simple and powerful method to develop inexpensive energy storage and photovoltaic devices based on ferroelectric ceramics. (AU)

• Processo FAPESP: 19/03110-8 - Síntese e caracterização fotovoltaica de filmes finos à base de perovskitas ferroelétricas e multiferróicas para aplicação em células solares
• Beneficiário: Mahmoud Saleh Mohammed Alkathy
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado