A wide-frequency range dielectric tuning of BaTiO3 by embedding metal nanocrystals

Fe nanocrystals (NCs) were embedded into the epitaxial BaTiO3 (BTO) matrix. According to optimized growth processes, a novel nanocomposite system was constructed, which consisted a well epitaxial BTO layer and three-dimensional Fe NCs. Based on this, the different dielectric response in the regions of low temperature-high frequency and low frequency-high temperature were revealed by the contribution of hopping and interfacial polarizations, respectively. With the increased amount of Fe NCs, the obvious enhancement in the low-frequency conductivity, middle frequency capacitance, and high-frequency inductive effect was found. The embedded metal NCs play an important role in tuning the dielectric behaviors and AC conductivity of oxide dielectrics. This significant rectification effect in wide-frequency ranges opens up a new direction for designing embedded nano-capacitors.

Automated summary

This study embeds iron nanocrystals into epitaxial BaTiO3 matrix, creating a novel nanocomposite system. Different dielectric responses in low temperature-high frequency and low frequency-high temperature regions are revealed by hopping and interfacial polarizations. The increase in iron nanocrystals leads to enhancement in low-frequency conductivity, middle-frequency capacitance, and high-frequency inductive effect.