Article

Dielectric, ferroelectric and optical properties of BaZr0.2Ti0.8O3 thin films prepared by sol–gel-hydrothermal process

Journal of Sol-Gel Science and Technology (impact factor: 1.63). 05/2012; 55(3):343-347. DOI:10.1007/s10971-010-2259-9

ABSTRACT BaZr0.2Ti0.8O3 thin films on Pt/Ti/SiO2/Si substrates have been fabricated under low temperature conditions by a sol–gel-hydrothermal technique. The dielectric constant
is 247–83 in the frequency range of 1kHz–1MHz. The corresponding dielectric loss is ~10−2. The capacitance–voltage curve shows strong non-linear dielectric behavior leading to a high tunability, up to ~30% at 1kHz.
The remanent polarization and coercive field at room temperature are measured to be ~1.5μC/cm2 and ~90kV/cm. The infrared optical properties of the thin films are investigated using an infrared spectroscopic ellipsometry
in the wave number range of 800–4,000cm−1. Optical constants of the thin films are simultaneously obtained.

KeywordsThin films-Low temperature technique-Dielectric properties

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Keywords

1kHz
 
coercive field
 
corresponding dielectric loss
 
KeywordsThin films-Low temperature technique-Dielectric properties
 
low temperature conditions
 
remanent polarization
 
room temperature
 
strong non-linear dielectric behavior
 
thin films
 
tunability
 
wave number range
 

J. B. Xu