Browsing NTNU Open by Author "Gaukås, Nikolai Helth"
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Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition
Gaukås, Nikolai Helth; Dale, Silje Marie; Ræder, Trygve Magnus; Toresen, Andreas; Holmestad, Randi; Glaum, Julia; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2019)Aqueous chemical solution deposition (CSD) of lead-free ferroelectric K0.5Na0.5NbO3 (KNN) thin films has a great potential for cost-effective and environmentally friendly components in microelectronics. Phase purity of KNN ... -
Epitaxial K0.5Na0.5NbO3 thin films by aqueous chemical solution deposition
Pham, Ky-Nam; Gaukås, Nikolai Helth; Morozov, Maxim; Tybell, Per Thomas Martin; Vullum, Per Erik; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2019)We report on an environmentally friendly and versatile aqueous chemical solution deposition route to epitaxial K0.5Na0.5NbO3 (KNN) thin films. The route is based on the spin coating of an aqueous solution of soluble ... -
Ferroelectric and dielectric properties of Ca2+-doped and Ca2+-Ti4+ co-doped K0.5Na0.5NbO3 thin films
Gaukås, Nikolai Helth; Glaum, Julia; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2020)Chemical solution deposition (CSD) of K0.5Na0.5NbO3 (KNN) thin films on silicon-based substrates is an interesting technology for fabrication of lead-free ferroelectric thin films. Here, we report on improved ferroelectric ... -
Flexible, biocompatible lead-free piezoelectric thin films for biomedical applications
Klaussen, Ragnhild Hyllnes (Master thesis, 2019)I dette masterprosjektet ble fleksible, faserene, piezoelektriske kalium-natrium niobat (KNN) tynnfilmer produsert ved å legge en KNN tynnfilm på et termisk stabilt substrat og deretter overføre filmen til en fleksibel ... -
In situ X-ray diffraction studies of the crystallization of K0. 5Na0. 5NbO3 powders and thin films from an aqueous synthesis route
Bakken, Kristine; Gaukås, Nikolai Helth; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)Aqueous chemical solution deposition is a promising route for ferroelectric K0.5Na0.5NbO3 (KNN) thin films, requiring a stable precursor solution with complexed Nb5+. Here, we report on the local structure of Nb-complexes ... -
In Vitro Biocompatibility of Piezoelectric K<inf>0.5</inf>Na<inf>0.5</inf>NbO<inf>3</inf>Thin Films on Platinized Silicon Substrates
Gaukås, Nikolai Helth; Huynh, Quy-Susan; Pratap, Anishchal A.; Einarsrud, Mari-Ann; Grande, Tor; Holsinger, R. M. Damian; Glaum, Julia (Peer reviewed; Journal article, 2020)Lead-free piezoelectric ceramics like K0.5Na0.5NbO3 (KNN) represent an emerging class of biomaterials for medical technology, as they can be used as components in implantable microelectromechanical systems (MEMS) and ... -
Interstitial oxygen as a source of p-type conductivity in hexagonal manganites
Skjærvø, Sandra Helen; Tjønneland Wefring, Espen; Nesdal, Silje K.; Gaukås, Nikolai Helth; Olsen, Gerhard Henning; Glaum, Julia; Tybell, Per Thomas Martin; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2016)Hexagonal manganites, h-RMnO3 (R=Sc, Y, Ho–Lu), have been intensively studied for their multiferroic properties, magnetoelectric coupling, topological defects and electrically conducting domain walls. Although point defects ... -
Lead-Free Ferroelectric KNN Films for Biomedical Applications
Gaukås, Nikolai Helth (Doctoral theses at NTNU;2020:246, Doctoral thesis, 2020)Ferroelectric materials are utilized in a wide range of different electronic devices throughout our modern society, including all kinds of consumer electronics, ultrasound equipment, minimally invasive surgical tools and ... -
Lead-free piezoelectric materials for medical application
Dale, Silje Marie (Master thesis, 2018)In this work, K0.5Na0.5NbO3, (KNN) and K0.495Na0.495Ca0.005NbO3 thin films for biomedical applications have been prepared from an aqueous precursor solutions with 2.5 or 5.0 mol% of alkali excess. Ca2+ was introduced as ... -
Oxygen Absorption in Nanocrystalline h-RMnO<inf>3</inf> (R = Y, Ho, Dy) and the Effect of Ti Donor Doping
Danmo, Frida Hemstad; Williamson, Benjamin Albert Dobson; Småbråten, Didrik Rene; Gaukås, Nikolai Helth; Østli, Elise Ramleth; Grande, Tor; Glaum, Julia; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2023) -
The Effect of Donor Doping with Ti4+ on the Oxygen Absorption Properties of h-YMnO3
Gaukås, Nikolai Helth (Master thesis, 2016)In this thesis, the effect of donor doping with Ti4+ on the oxygen absorption properties in the hexagonal rare-earth magnanite h-YMnO3 was studied and compared to undoped compounds of the same material class. Bulk-sized ...