20.500.12556/RUL-177291 Lokalna karakterizacija piezoelektričnih in feroelektričnih lastnosti keramičnih plasti in kompozitnih nanopalčk Local characterization of the piezoelectric and ferroelectric properties of ceramic films and composite nanorods V delu smo raziskali feroelektrične in piezoelektrične lastnosti dveh sistemov: debelih plasti $\mathrm{0.5BaZr_{0.2}Ti_{0.8}O_3–0.5Ba_{0.7}Ca_{0.3}TiO_3}$ (BZT-BCT) in kompozitnih nanopalčk $\mathrm{CoFe_2O_4/(Ba_{0.95}Ca_{0.05})(Ti_{0.89}Sn_{0.11})O_3}$ (CFO/BCTS), pri čemer smo uporabili tehnike mikroskopa na atomsko silo. Pri debelih plasteh BZT-BCT smo ugotovili homogeno mikrostrukturo. S piezoodzivno mikroskopijo (PFM) smo pokazali, da plasti izkazujejo piezoelektrični odziv. Zaznali smo tudi preklapljanje feroelektričnih domen znotraj plasti. Meritve PFM kompozitnih nanopalčk CFO/BCTS so pokazale piezoelektrični odziv v vertikalni in literarni smeri in potrdile preklapljanje feroelektričnih domen. Izmerjen je bil maksimalni lokalni piezoelektrični koeficient d$_{33} \approx 6 \ \mathrm{\frac{pm}{V}}$. Znotraj nanopalčk so bila zaznana tudi območja brez piezoelektričnega odziva, ki ustrezajo fazi CFO. PFM je nepogrešljivo orodje za analizo feroelektričnih materialov. Pridobljene ugotovitve prispevajo k boljšemu razumevanju feroelektričnih lastnosti vzorcev na nanoravni in potrjujejo njihov potencial za uporabo v senzorskih in drugih funkcijskih napravah. In this work, we investigated the ferroelectric and piezoelectric properties of two systems: $\mathrm{0.5BaZr_{0.2}Ti_{0.8}O_3–0.5Ba_{0.7}Ca_{0.3}TiO_3}$ (BZT-BCT) thick films and $\mathrm{CoFe_2O_4/(Ba_{0.95}Ca_{0.05})(Ti_{0.89}Sn_{0.11})O_3}$ (CFO/BCTS) composite nanorods. The investigation was carried out using advanced atomic force microscopy techniques. For the BZT-BCT thick films, we confirmed a homogeneous microstructure. Piezoresponse force microscopy (PFM) demonstrated that the films exhibit a clear piezoelectric response, and domain switching characteristic of ferroelectricity was also observed. PFM measurements of the CFO/BCTS composite nanorods revealed piezoelectric responses in both the vertical and lateral directions, confirming ferroelectric domain switching. The maximum local piezoelectric coefficient was determined to be d$_{33} \approx 6 \ \mathrm{\frac{pm}{V}}$. In addition, certain regions within the nanorods showed no piezoelectric activity, which correspond to the CFO phase. These results highlight PFM as an indispensable tool for nanoscale characterization of ferroelectric materials. The findings provide valuable insights into the local electromechanical behavior of BZT-BCT thick films and CFO/BCTS nanorods and confirm their potential for applications in sensors and other functional devices. feroelektriki piezoelektrični materiali debele keramične plasti $\mathrm{0.5BaZr_{0.2}Ti_{0.8}O_3–0.5Ba_{0.7}Ca_{0.3}TiO_3}$ kompozitne nanopalčke $\mathrm{CoFe_2O_4/(Ba_{0.95}Ca_{0.05})(Ti_{0.89}Sn_{0.11})O_3}$ mikroskopija na atomsko silo piezoodzivna mikroskopija multiferoični materiali ferroelectrics piezoelectric materials $\mathrm{0.5BaZr_{0.2}Ti_{0.8}O_3–0.5Ba_{0.7}Ca_{0.3}TiO_3}$ ceramic thick films $\mathrm{CoFe_2O_4/(Ba_{0.95}Ca_{0.05})(Ti_{0.89}Sn_{0.11})O_3}$ composite nanorods atomic force microscopy (AFM) piezoresponse force microscopy (PFM) multiferroic materials true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-12-19 13:00:26 2025-12-19 13:00:34 2025-12-29 04:17:20 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 159094 260826627 21057.pdf 21057.pdf 1 D5AA8581A7134DCFDE656FA6197E3ADF b9e9675cab7b84fac7edf531b819f53481442b0f22bb815174661f2ac32883ad e1581edc-dcd1-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224247 Fakulteta za matematiko in fiziko 0 0 0