Crystallization kinetic and structural characterization of lead-free piezoelectric 0.94(Na0.5Bi0.5)TiO3-0.06BaTiO(3) by polymeric precursor method

Autor(es)

Alves da Silva, Gislayne Rayane ^[1] ; Fernandez Perdomo, Claudia Patricia ^[1] ; Klein-Gunnewiek, Rodolfo Foster ^[1] ; Goldschmidt Aliaga Kiminami, Ruth Herta ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Mat Engn Dept, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 277, FEB 1 2022.
• Citações Web of Science: 0

Resumo

The 0.94(Na0.5Bi0.5)TiO3-0.06BaTiO(3) (NBT-BT6) system is a promising lead-free piezoelectric material with excellent piezo and ferroelectric properties. In this paper, the systematic study of crystallization kinetics and structural characterization of NBT-BT6 obtained via polymeric precursor was analyzed, emphasizing the calculation of formation energy by non-isothermal methods and morphological evaluation of NBT-BT6 nano-powders. According to the results of TGA-DTG/DTA thermal analyses and XRD, at 450 degrees C the initial process of crystallization of NBT-BT6 was observed at a concentration of 65.54%, with formation energy between 121 and 167 kJ/mol, an unprecedented value in the literature on the crystallization of the NBT-BT6 complex system. The results of the DSC thermal analysis verified the formation of the ferroelectric NBT-BT6 phase with a rhombo-hedral -tetragonal phase transition at 270 degrees C, associated with the morphotropic (MPB) phase contour of this material. The RAMAN spectroscopy and XRD results after Rietveld refinement confirmed the coexistence of rhombohedral and tetragonal structures in the nanopowders (similar to 50 nm) 100% of the phase of interest obtained at 650 degrees C. (AU)

• Processo FAPESP: 17/13769-1 - Materiais multiferróicos e ferroelétricos para conversores de energia: síntese, propriedades, fenomenologia e aplicações
• Beneficiário: José Antonio Eiras
• Modalidade de apoio: Auxílio à Pesquisa - Temático