Development of Tunable Ferroelectric Ceramic Capacitors

Autor(es)

Aredes, Rangel G. G. ; Antonelli, Eduardo ; Silva Neto, Lauro P. ; Rossi, Jose O. O. ; Lima, Gustavo N. N. ; Barroso, Joaquim J. J. ; Rangel, Elizete G. L. ; Schamiloglu, Edl

• Tipo de documento: Artigo Científico
• Fonte: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL; v. 70, n. 8, p. 8-pg., 2023-08-01.

Resumo

Ferroelectric perovskite ceramics with a high dielectric constant, low loss, high tunability, and high electric breakdown are ideal for nonlinear transmission lines (NLTLs) to generate radio frequency (RF) signals at high-power levels. To achieve the required properties, a comprehensive study of the material phase transitions and the optimal ratio adjustment between the chemical elements in the perovskite crystal structure is required. The advancement of this solid-state technology is the most promising optimization for NLTLs in developing high-power (>100 MW) devices with high tunability (>60%) and high repetition rate (>1 kHz) for soliton generation. The barium strontium zirconium titanate (BSZT) ceramic compositions were synthesized and characterized to maximize material tunability. The composition Ba(0.97)Sr(0.03)Zr(0.2)Ti(0.8)O3 exhibited a high permittivity (>12200), low loss tangent (< 0.01), and an exceptional tunability of the order of 79% at an electric field of 10 kV/cm near the phase temperature transition at 300 K. Ferroelectric ceramic is an outstanding material with promising characteristics for producing RF signals in an NLTL, and here, the BSZT is considered for this application. (AU)

• Processo FAPESP: 18/26086-2 - Geração de radiofrequência usando linhas de transmissão não lineares giromagnéticas para aplicações aeroespaciais
• Beneficiário: José Osvaldo Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/04395-3 - Sinterização e caracterização de cerâmicas dielétricas de alta permissividade do tipo BZT-BaTiZrO3 e BST - BaTiSrO3 para aplicações em linhas de transmissões não lineares
• Beneficiário: Lauro Paulo da Silva Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular