Colossal Dielectric Constant of Nanocrystalline/Amorphous Homo-Composite BaTiO₃ Films Deposited via Pulsed Laser Deposition Technique.

ABSTRACT: We report the pulsed laser deposition (PLD) of nanocrystalline/amorphous homo-composite BaTiO₃ (BTO) films exhibiting an unprecedented combination of a colossal dielectric constant (ε_r) and extremely low dielectric loss (tan δ). By varying the substrate deposition temperature (T_d) over a wide range (300-800 °C), we identified T_d = 550 °C as the optimal temperature for growing BTO films with an ε_r as high as ~3060 and a tan δ as low as 0.04 (at 20 kHz). High-resolution transmission electron microscopy revealed that the PLD-BTO films consist of BTO nanocrystals (~20-30 nm size) embedded within an otherwise amorphous BTO matrix. The impressive dielectric behavior is attributed to the combination o

SUBMITTER: Kondo S 

PROVIDER: S-EPMC11510155 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature