The dependence of the dielectric properties on the uniaxial compressive stress and the stress-strain properties was investigated. The time dependence and irreversible changes of the dielectric properties were connected with the domain structure of the materials, which is modified under the applied stress. The irreversible changes observed in the macroscopically nonferroelectric compositions were related to the ferroelastic properties. The stress sensitivity increased with the addition of NaTaO3 from 3% in pure Na0.5Bi0.5TiO3 to 14% in the sample with 15 mol% of NaTaO3.
COBISS.SI-ID: 24268071
In the investigation an influence of the processing parameters and media was studied to the properties of CaCO3 particles. Dependent on the applied parameters a different morphology with the complex hierarchically structured CaCO3 particles were precipitated in aragonite or calcite crystal structure.
COBISS.SI-ID: 23583271
In this paper the influences of the substrates, the annealing temperature, the concentration and the Rh value of the solution on the microstructure of the Bi12SiO20 thin films were investigated. The results showed that the Bi12SiO20 starts to form at 500°C and that single-phase Bi12SiO20 polycrystalline thin films are formed at 700°C. The microstructure analysis of thin films showed that synthesis parameters and the substrate has significant influence on the dense of the Bi12SiO20 thin film formation.
COBISS.SI-ID: 23132711
We have investigated the Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 system as a promising material for piezoelectric applications. XRD showed a gradual change of the symmetry with the presence of an intermediate morphotropic region in the samples with a compositional fraction x between 0.17 and 0.25. Electrical measurements on the samples showed that the maximum values of the dielectric constant, the remanent polarization and the piezoelectric coefficient are reached at the morphotropic phase boundary (? = 1140 at 1 MHz; Pr =40C/cm2; d33 = 134 pC/N).
COBISS.SI-ID: 23175463
Nanocrystalline Ag/TiO2 composite thin films were synthesized using a two-steps: the in-situ precipitation of Ag nanoparticles followed by an in-situ sol-gel reaction of titanium iso-propoxide in a weak-polyion-multilayer (PEM) template. The subsequent annealing of the precursor yields nanostructured Ag(x)/TiO2 films. In the near-UV range the expected photo-catalytic behavior of TiO2 is greatly enhanced as it is assisted by the near-field amplitudes of the localized surface plasmon resonance (LSPR) of the Ag nanoparticles in the Ag(x)/TiO2 films.
COBISS.SI-ID: 23788071