Barium Strontium Titanate Ferroelectric Films Research Articles

Efficiency of thermoelectric conversion in ferroelectric film capacitive structures

Thermal heating/cooling conditions for metal-insulator-metal structures based on barium strontium titanate ferroelectric films are studied by numerical methods with the aim of their application in capacitive thermoelectric converters. A correlation between the thermal and capacitive properties of thin-film ferroelectric capacitors is considered. The time of the temperature response and the rate of variation of the capacitive properties of the metal-insulator-metal structures are determined by analyzing the dynamics of thermal processes. Thermophysical calculations are carried out that take into consideration the real electrical properties of barium strontium titanate ferroelectric films and allow estimation of thermal modulation parameters and the efficiency of capacitive thermoelectric converters on their basis.

Investigation of the initial stages of the growth of barium strontium titanate ferroelectric films by medium-energy ion scattering

The initial stages of the growth of barium strontium titanate (BaSrTiO3) ferroelectric films deposited on single-crystal sapphire substrates have been studied using medium-energy ion scattering. It has been found that, depending on the variation in the deposition temperature, the mechanisms of formation of the ferroelectric film change as a result of the change in the mechanism of mass transfer of the deposited atoms. It has been shown that the minimum thickness of the continuous ferroelectric film on sapphire is of the order of 6 nm.

Component composition and strain of barium-strontium titanate ferroelectric films

The effect of the ratios of the cationic components and internal strains on the critical temperature T c and the dielectric characteristics of BSTO ferroelectric films grown on α-Al2O3 [1012] and LaAlO3 substrates were investigated. Ion backscattering diagnostics revealed a barium deficiency in the surface layer of the films and showed that the films differ in structural quality.