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Local mechanical properties of perovskite oxide ferroelectric materials

Author(s): Katarina Žiberna (Author), Andreja Benčan Golob (Supervisor), Hana Uršič Nemevšek (Co-Supervisor)

Year: 2025

Type: Doctoral dissertation

Ferroelectric materials have the ability to convert electrical energy into mechanical energy and vice versa, which makes them widely used as sensors, actuators, and ultrasonic transducers. While their electrical and electromechanical properties are well studied, mechanical properties like Young’s modulus (E) and hardness (H) remain known to a lesser extent. …

New approaches in calibration for multielement laser ablation inductively coupled plasma mass spectrometry analysis

Author(s): Kristina Mervič (Author), Vid Simon Šelih (Supervisor), Martin Šala (Co-Supervisor)

Year: 2024

Type: Doctoral dissertation

One of commonly used analytical technique for direct elemental analysis of solid samples is Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Although widely used for the analysis of various samples, obtaining accurate quantitative results remains a major challenge as matrix-matched standards are required. The aim of this thesis was …

Hidrothermal topochemical conversion of Bi4Ti3O12 nanoplatelets for formation of functional heterostructural perovskite titanates

Author(s): Alja Čontala (Author), Marjeta Maček Kržmanc (Supervisor)

Year: 2023

Type: Doctoral dissertation

In the view of designing new nanostructured materials and tailoring their functional properties, understanding the nucleation and crystal growth mechanisms is becoming increasingly important. Nowadays, one of the most addressed scientific and social problems are those facing energy shortage and global warming. People started to realize the value and importance …

Atomically resolved transmission electron microscopy and in-situ voltage driven dynamic response of domain walls in lead-free ferroelectrics

Author(s): Oana-Andreea Condurache (Author), Andreja Benčan Golob (Supervisor), Goran Dražić (Co-Supervisor)

Year: 2023

Type: Doctoral dissertation

Ferroelectric domain walls (DWs) are nano-to-atomic-scale interfaces that separate domains of different polar order. What makes DWs so interesting is their dynamic nature in an electric field, which offers an exciting potential for nanoscale and atomic-scale applications, but, also, more generally, the dynamics of DWs is linked to a fundamental …

Alkali-activated steel slag-based materials

Author(s): Mark Češnovar (Author), Vilma Ducman (Supervisor), Srečo Davor Škapin (Co-Supervisor)

Year: 2022

Type: Doctoral dissertation

Alkali activation is a chemical process in which aluminosilicate-rich materials that dissolve in basic media at room temperature form binding phases by polycondensation. Alkali-activated materials (AAM), also called geopolymers, are inorganic aluminosilicate-based materials produced mainly from fly ashes and metallurgical slags or clays with high Al and Si content and …

Electron microscopy of titanium oxynitride supported iridium based electrocatalysts

Author(s): Gorazd Koderman Podboršek (Author), Goran Dražić (Supervisor)

Year: 2022

Type: Doctoral dissertation

We are speeding full throttle towards a climate catastrophe and we have only until 2030 to take action to avoid the most devastating and unimaginable consequences. The lack of political and corporate will to change the status quo of “business as usual” is causing mass protests and civil disobedience globally. …

Optical emission spectroscopy as a tool for monitoring cold atmospheric pressure plasma processes

Author(s): Andrea Jurov (Author), Uroš Cvelbar (Supervisor), Nataša Hojnik (Co-Supervisor)

Year: 2021

Type: Doctoral dissertation

Non-equilibrium atmospheric pressure plasmas are used in many areas, such as food and agriculture, plasma medicine, plasma surface modification, material synthesis and deposition. Because of their versatility, many plasma setups have been developed. Of greater interest are those that operate at atmospheric pressure, like atmospheric pressure plasma jets (APPJs). Regarding …