Influence of BaTiO3 nanoparticles/clusters on the structural and dielectric properties of glasses-nanocomposites

摘要

Glass nanocomposite (GNCs) samples in the composition [(90-x) Li2B4O7- xBaTiO3-10Nb2O5] with x = 5, 7.5, 10, 12.5 and 15 (in mol%) were prepared. Rietveld refinement of the data for the reagent grade of the BaTiO3 revealed that the structure is a tetragonal phase (space group P4mm). The energy dispersive X-Ray (EDX) spectra and scanning electron microscopic (SEM) micrographs exhibit the two phases (BaTiO3 nanopatricles/clusters phase and residual glass phase) of the GNCs samples. The BaTiO3 nanoparticles/clusters in the glass matrix were confirmed by transmission electron microscopic (TEM) and Fourier transform infrared (FTIR) studies. The deconvolution of the FTIR spectra of the GNCs samples reveals the presence of BO3, BO4, NbO4 and NbO6 units. The dielectric results exhibit the ferroelectric of BaTiO3 nanoparticles/clusters in the GNCs samples at x = 10, 12.5 and 15 mol%. The dielectric constant, dielectric loss and ac conductivity for the GNCs samples as a function of temperature at various frequencies in 120Hz 100 k Hz range have been studied.