Role of the microstructure in the neutron and gamma-ray irradiation stability of solution-derived Ba0.5Sr0.5TiO3 thin films

Robust Tunability and Newly Emerged Q Resonance of Ba0.8Sr0.2TiO3-Based Microwave Capacitors under Gamma Irradiations

“…22 Impacts of gamma and neutron irradiations on the chemical and dielectric properties of solution-derived polycrystalline Ba 0.5 Sr 0.5 TiO 3 thin films have also been systematically investigated to reveal that the finer-grained films showed significantly lower permittivity due to higher accumulation of irradiation damages such as cracks and porosities in microwave frequencies. 23 Further, a dramatic increase in the Curie temperature to almost 800 °C in BaTiO 3 thin films was engineered by high-density defect dipoles formed by excessively high laser energies during the pulsed laser deposition (PLD) growth. 24 To exploit the potential space application of microwave Q and n resonance in ferroelectric BST 0.8 thin films at room temperature, the films were exposed to a series of gamma-ray irradiations ranging from 0 to 100 kGy.…”

“…Special attention has been given to the structural evolution and defect generation in epitaxial BaTiO 3 thin films where amorphization, A-site ion vacancies, and interstitials were observed to occur under Ne ion bombardments . Impacts of gamma and neutron irradiations on the chemical and dielectric properties of solution-derived polycrystalline Ba 0.5 Sr 0.5 TiO 3 thin films have also been systematically investigated to reveal that the finer-grained films showed significantly lower permittivity due to higher accumulation of irradiation damages such as cracks and porosities in microwave frequencies . Further, a dramatic increase in the Curie temperature to almost 800 °C in BaTiO 3 thin films was engineered by high-density defect dipoles formed by excessively high laser energies during the pulsed laser deposition (PLD) growth …”

Influence of neutron and gamma irradiation on the electrocaloric properties of Mn-doped 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 ceramics

“…A phenomenological model has been proposed to relate measurable degradation of physical properties of functional oxides, including ferroelectrics, depending on the total ionization dose, notwithstanding the type of ionization [20]. Microstructural features, such as grain and related domain size and porosity, were found to influence the radiation hardness of polycrystalline ferroelectrics, bulk and thin films [21][22][23].…”

Elliptically polarized frequency agile antenna on ferroelectric substrate

“…This paper presents a novel antenna architecture with integrated ferroelectric varactor, which was designed to manufacture a simple yet efficient tunable antenna https://doi.org/10.33180/InfMIDEM2018.405 for satellite communications at frequencies between 6.875 and 7.050 GHz. In addition to tunable center frequency it is characterized also with elliptical polarization and good cosmic irradiation hardness [7]. Antenna is fed through a coplanar waveguide (CPW) loaded with an interdigital (IDC) varactor made on Ba 0.3 Sr 0.7 TiO 3 thin-film substrate.…”