We investigated ferroelectric, piezoelectric and electrostrictive properties of K0.5Na0.5NbO3 single crystals prepared by solid state crystal growth (SSCG). The discovery of a high electrostrictive coefficient (M33=2.59•10-14 m2/V2) is especially interesting. The main contribution to the high electrostrictive strain, which is significantly higher than the values reported in the open literature, arises from the contribution of 180° domain walls.
COBISS.SI-ID: 23375655
The ferroelectricity of BiFeO3 ceramics is characterized by strong domain-wall pinning effect caused by the presence of charged defects. Formation of defects associated with Bi2O3 loss during annealing at high temperatures leads to depinning of domain walls. To the best of our knowledge, the measured piezoelectric d33 coefficient of 44 pC/N is presently the highest reported in the literature.
COBISS.SI-ID: 24015655
A detailed study of the synthesis of the (K,Na,Li)(Nb,Ta)O3 (KNLNT) solid solution revealed that the formation of the amorphous carbonato complex during the mechanochemical activation step is essential in order to obtain KNLNT ceramics with high homogeneity and improved piezoelectric response.
COBISS.SI-ID: 23538727
The structural and microstructural properties of PMN-PT thick films screen-printed on different substrates. i.e., alumina, Pt, PMN-PT and AlN were studied. The microstructures, phase compositions (tetragonal to monoclinic phase ratio) and electric properties strongly depend on the choice of the substrate material mainly due to different temperature expansion coefficients of the films and substrates. This is the first example in literature showing the strain relaxation through phase transition in ferroelectrics thick films
COBISS.SI-ID: 23583783
We studied the low-temperature CSD of ZnO thin films. Microstructural and chemical analyses showed that the Zn-acetate derived thin films heated at 150oC in air were amorphous and contained no organic residues. The films deposited on SiOx/Si and heated at 450oC were crystalline and consisted of randomly oriented grains with a diameter of about 20 nm. All thin films were transparent, exhibiting a transmission of over 80 % in the visible range.
COBISS.SI-ID: 23705383