Browsing NTNU Open by Author "Glaum, Julia"
Now showing items 1-20 of 23
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Biocompatibility of (Ba,Ca)(Zr,Ti)O3 piezoelectric ceramics for bone replacement materials
Poon, Kara; Wurm, Matthias C.; Evans, Donald; Einarsrud, Mari-Ann; Lutz, Rainer; Glaum, Julia (Journal article; Peer reviewed, 2019)Total joint replacement implants are generally designed to physically mimic the biological environment to ensure compatibility with the host tissue. However, implant instability exposes patients to long recovery periods, ... -
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 ... -
Determining fundamental properties from diffraction: Electric field induced strain and piezoelectric coefficient
Hinterstein, Manuel; Lee, Kaiyang; Esslinger, Sophia; Glaum, Julia; Studer, Andrew; Hoffman, Mark John; Hoffmann, Michael (Peer reviewed; Journal article, 2019)Neutron powder diffraction was used in operando to determine the macroscopic strain and piezoelectric coefficient as a function of applied electric field in a technically relevant actuator material. We were able to ... -
Development of Piezoelectric BCZT Ceramics as Electroactive Bone Implant Material
Poon, Kara Kamen (Doctoral theses at NTNU;2020:148, Doctoral thesis, 2020)The functionalisation of current load-bearing bone implant metals with piezoelectric ceramics is envisioned as a novel opportunity for promoting tissue healing and improving the strength of the bone-implant interface through ... -
Dielectric and piezoelectric properties of barium calcium zirconate titanate ceramics
Johnsen, Elin Hagen (Master thesis, 2019)Det ferroelektriske systemet barium calcium zirconate titanate er av høy interesse for bruk i industrielle applikasjoner på grunn av eksepsjonelt høye piezoelektriske koeffisienter. Videre så utgjør det et interessant ... -
Effect of mechanical depoling on piezoelectric properties of Na0.5Bi0.5TiO3 - xBaTiO3 in the morphotropic phase boundary region
Denis, L; Glaum, Julia; Hoffman, Mark; Daniels, John E.; Hooper, Ryan; Tutuncu, Goknur; Forrester, Jennifer; Jones, Jacob L. (Journal article; Peer reviewed, 2018)The effect of mechanical stress on the direct piezoelectric properties of pre-poled (1 − x)(Na0.5Bi0.5)TiO3–xBaTiO3 (NBT–xBT) in the range 4% ≤ x ≤ 13% was studied in situ using a mechanical load frame. Prior to mechanical ... -
Enhanced in-plane ferroelectricity in BaTiO3 thin films fabricated by aqueous chemical solution deposition
Ræder, Trygve Magnus; Bakken, Kristine; Glaum, Julia; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2018)Ferroelectric BaTiO3 is widely used in capacitors, but the low Curie temperature limits a further use of BaTiO3. In this work we present an aqueous chemical solution deposition (CSD) route for BaTiO3 thin films, demonstrating ... -
Epoxy-Based Nanocomposites for High-Voltage Insulation: A Review
Adnan, Mohammed Mostafa; Tveten, Erlend Grytli; Glaum, Julia; Ese, Marit-Helen Glomm; Hvidsten, Sverre; Glomm, Wilhelm; Einarsrud, Mari-Ann (Journal article, 2018)Epoxy nanocomposites, with inorganic oxide nanoparticles as filler, can exhibit novel property combinations, such as enhanced mechanical strength, higher thermal conductivity, increased dielectric breakdown strength, and ... -
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 ... -
Freeze casting of piezoelectric BCZT for biomedical applications
Andersen, Freya Sofia (Master thesis, 2019)Bruken av piezoelektriske keramer som beinimplantat gir muligheten til å forsterke heling av skadet bein gjennom elektrisk stimulering in vivo. På denne måten kan rekonvalesenstiden og sannsynligheten for revisjonsutskiftninger ... -
Frequency dependent polarisation switching in h-ErMnO3
Ruff, Alexander; Li, Ziyu; Loidl, Alois; Schaab, Jakob; Fiebig, Manfred; Cano, Andres; Yan, Zewu; Bourret, Edith; Glaum, Julia; Meier, Dennis; Krohns, Stephan (Journal article; Peer reviewed, 2018)We report an electric-field poling study of the geometric-driven improper ferroelectric h-ErMnO3. From a detailed dielectric analysis we deduce the temperature and frequency dependent range for which single-crystalline ... -
High piezoelectricity by multiphase coexisting point: Barium titanate derivatives
Gao, Jinghui; Ke, Xiaoqin; Acosta, Matias; Glaum, Julia; Ren, Xiaobing (Journal article; Peer reviewed, 2018)BaTiO3-based lead-free piezoelectric materials have long been known as “a mediocre class of piezoelectric materials.” However, they have seen significant renewed interest in recent years ever since the discovery of high ... -
In situ Characterization of Ferroelectric Oxide Thin Films during Aqueous Chemical Solution Deposition
Bakken, Kristine (Doctoral theses at NTNU;2020:144, Doctoral thesis, 2020)Ferroelectric materials are used in a wide range of applications, including capacitors and non-linear optical devices. Utilization of ferroelectric thin films is especially desirable due to the possibility to tailor the ... -
In situ synthesis of hybrid inorganic-polymer nanocomposites
Adnan, Mohammed Mostafa; Dalod, Antoine Robert Marie; Balci, Mustafa H; Glaum, Julia; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)Hybrid inorganic–polymer nanocomposites can be employed in diverse applications due to the potential combination of desired properties from both the organic and inorganic components. The use of novel bottom–up in situ ... -
In-plane Ferroelectricity in Barium Titanate Films
Ræder, Trygve Magnus (Doctoral theses at NTNU;2020:201, Doctoral thesis, 2020)Ferroelectric materials are irreplaceable materials in electronics used everywhere in the modern society. The ferroelectric perovskites are the most widely used class of ferroelectric materials, and the use is dominated ... -
Influence of Artificial Porosity on Piezoelectric Behavior of (K,Na)NbO3 (KNN) Bulk Ceramics
Ommedal, Mari Berge (Master thesis, 2016)The influence of artificial porosity on the piezoelectric behaviour of KNN was studied for possible biomedical applications. A "piezoelectric effect" observed in bone is expected to trigger bone growth and healing. Therefore, ... -
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 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 ... -
Novel synthesis method of BaTiO3-nanoparticles - Synthesis of BaTiO3-nanoparticles by spray-pyrolysis of TiO2-nanoparticles dispersed in Ba(NO3)2-solution
Gryteselv, Magnus (Master thesis, 2016)Ferroelectric materials are widely used in different technological applications. Lead zirconate titanate (PZT) materials are currently the most used, due to their excellent piezoelectric properties and relatively high ... -
Orthorhombic-tetragonal phase transition induced by Ta isovalent doping and its effect on fatigue characteristics of KNL-NSTx ceramics
Namsar, Orapim; Uthaisar, Chunmanus; Glaum, Julia; Pojprapai, Soodkhet (Journal article; Peer reviewed, 2018)The effect of Ta addition on the bipolar fatigue characteristics of lead-free KNL-NSTx ceramics (x = 0, 0.04, 0.07 and 0.11 mol%) is studied. Bipolar cycling up to 1 × 106 cycles leads to strong degradation of the polarization ...