Potassium sodium niobate based solid solutions are among the most promising candidates for lead-free piezoceramics. The highest piezoelectric response was found in the vicinity of K0.5Na0.5Nb03. It was explained by the presence of morphotropic phase boundary. Our results show acontinuous change of crystallographic parameters in the composition range KxNa(l-x)Nb03, for 0.4 ≤ x ≤ 0.6, which would indicate the presence of the morphotropic phase boundary, meaning that a suitable physical backqround should be found for the enhanced piezoelectric response of K0.5Na0.5Nb03 composition.
COBISS.SI-ID: 22292775
The ferroelectricity of BiFe03 ceramics is characterized by strong domain- wall pinning effect caused by the presence of charged defects. Formation of defects associated with Bi203 loss during annealing at high temperatures leads to depinning of domain walls. To the best of our knowledqe, the measured piezoelectric d33 coefficient of 44 pC/N is loresentlv the hiqhest reported in the literature.
COBISS.SI-ID: 24015655
Highly dense potassium tantalate bulk ceramic was prcessed by mechanochemical activation of the reagents. The dielectric permittivity of the ceramic with more than 95 % relative density at 5 K and 1 kHz is comparable to the values obtained in single crystals and it is among the highest reported values for potassium tantalate ceramics without chemical modification or sintering aids.The result indicates a negligible influence of grain boundaries on the dielectric response in the tantalate unlike in the most studied incipient ferroelectric strontium titanate.
COBISS.SI-ID: 25804583
The aim of this review article on recent developments of mechanochemistry is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions.
COBISS.SI-ID: 26654759
The study reports the inkjet printing of Pb(Zr0.53Ti0.47)O3 (PZT) thick films. An ink consisting of particles with a median size of 170 nm and a narrow size distribution, in a dispersion of water and glycerol, and with a low viscosity and surface tension, was used for the fabrication of thick films by piezoelectric ink-jet printing on platinized alumina substrates. A local piezoelectric response of 15 pm/V was measured in the ink-jet–printed PZT thick film by piezoresponse force microscopy.
COBISS.SI-ID: 27023911