Producción CyT
Congreso
Autoría
Difeo, Mauro
;
Madrigal, Juan Daniel
;
Pérez, Nicolás
;
Ramajo, Leandro
;
Castro, Miriam
Fecha
2025
Editorial y Lugar de Edición
LACA
Resumen
Información suministrada por el agente en
SIGEVA
Piezoelectric materials based on lead zirconate titanate (PZT) are highly prevalent in electronic devices owing to their outstanding electrical properties, particularly in proximity to the morphotropic phase boundary (MPB) where tetragonal and rhombohedral phases meet. However, the European Union (EU) has imposed stringent regulations on hazardous substances, propelling research efforts toward lead-free piezoceramics [1]. Among the alternatives, bismuth sodium titanates (BNT) have garnered sign...
Piezoelectric materials based on lead zirconate titanate (PZT) are highly prevalent in electronic devices owing to their outstanding electrical properties, particularly in proximity to the morphotropic phase boundary (MPB) where tetragonal and rhombohedral phases meet. However, the European Union (EU) has imposed stringent regulations on hazardous substances, propelling research efforts toward lead-free piezoceramics [1]. Among the alternatives, bismuth sodium titanates (BNT) have garnered significant attention due to their polymorphic phase boundary between orthorhombic and tetragonal phases. Despite their promise, BNT ceramics present challenges such as high coercive electric fields and leakage currents, limiting their widespread adoption. To overcome these limitations, researchers have turned to (Bi0.5Na0.5)TiO3–BaTiO3 (BNT-BT) solid solutions [2]. These materials undergo a polymorphic phase transition, exhibiting favorable piezoelectric properties and emerging as viable candidates to supplant lead-based piezoelectrics. This study investigates the effects of Cu and Zr doping on BNT-BT ceramic materials, where CuO addition improves the sintering process and ZrO2 doping enhances the ferroelectric properties.Figure 1. Results of the DRX analysis of BNT-BT samples doped with Cu+2 and Zr+4, indicating the sum of the Gaussian peaks corresponding to the (111) tetragonal phase (green) and the (003) and (021) rhombohedral phase (pink and blue, respectively).The incorporation of Cu²⁺ and Zr⁺4 into the perovskite structure of BNT-BT, as shown in Figure 1, induces a transformation of the crystalline lattice from orthorhombic to tetragonal symmetry. Moreover, the combination of Cu²⁺ and Zr⁺ results in a predominantly tetragonal structure. Furthermore, the ferroelectric properties of the ceramic are enhanced due to the lower porosity and higher piezoelectric (d33) and dielectric (33) values, which increase with the addition of these dopants. This suggests that the incorporation of Cu²⁺ and Zr⁺4 into the BNT-BT system is an effective strategy to optimize the structural and functional properties of the material.
Ver más
Ver menos
Palabras Clave
BNT-BTCuOLead-Free piezoelectrics