resumo
The main aim of this work was to estimate the dielectric constant of electrospun BaTiO3 nanofibers (BT NFs) using theoretical models. The effect of calcination temperatures on morphology and crystal structure of BT NFs was also investigated by using SEM, TEM, XRD and Raman spectroscopy. The dielectric constant of BT NFs was calculated by applying modified Maxwell Garnett and Yamada models on polymer nanocomposite films comprising stearic acid modified BT NFs in Polyvinylidene difluoride (PVDF) matrix. The results showed that although it was detected low tetragonality (1.0041) at lowest calcination temperature (850 degrees C), the better crystallization of BT and high tetragonality could be achieved at a calcination temperature of 1000 degrees C and above. Based on both theoretical models, the dielectric constant of BT NFs calcined at 850 degrees C (around 830) is lower than those calcined at 1000 degrees C (about 1300), which is the result of different tetragonality and grain size.
palavras-chave
BARIUM-TITANATE NANOFIBERS; FERROELECTRIC PROPERTIES; FINE PARTICLES; POLYMER MATRIX; PERMITTIVITY; SIZE; COMPOSITES; PROPERTY; BEHAVIOR; DENSITY
categoria
Materials Science, Ceramics
autores
Hedayati, M; Taheri-Nassaj, E; Yourdkhani, A; Borlaf, M; Rasekh, S; Amirkhizi, P; Sebastian, T; Payandeh, S; Clemens, FJ
nossos autores
Parisa Amir Khizi
Estudante de doutoramento
Shahed Rasekh
Investigador Júnioragradecimentos
The authors would like to appreciate the Empa internal funding and SNF project No. 206021 164024 for financing the new instrument (DSC-TGA).