Blar i Institutt for materialteknologi på tidsskrift "Journal of Applied Physics"
Viser treff 1-15 av 15
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Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3 – BiFeO3 ceramics
(Journal article; Peer reviewed, 2014)Here, we report on a giant dielectric relaxation in (1 x)Bi0.5K0.5TiO3—xBiFeO3 ceramics below 300 C, which becomes more pronounced with increasing BiFeO3 content. The relaxation was shown to be of Maxwell-Wagner type ... -
Characterization of ferroelectric domain walls by scanning electron microscopy
(Peer reviewed; Journal article, 2020)Ferroelectric domain walls are a completely new type of functional interface, which have the potential to revolutionize nanotechnology. In addition to the emergent phenomena at domain walls, they are spatially mobile and ... -
Direct monitoring of minority carrier density during light induced degradation in Czochralski silicon by photoluminescence imaging
(Journal article; Peer reviewed, 2013)In this paper, we present a new method for studying the light induced degradation process, in which the minority carrier density is monitored directly during light soaking by photoluminescence imaging. We show experimentally ... -
Domains and domain walls in ferroic materials
(Peer reviewed; Journal article, 2021)Ferroic materials exhibit long-range order with respect to their elastic, electric, or magnetic properties, giving rise to fascinating physics and functional properties that are used in, e.g., state-of-the-art sensor ... -
Effect of crystallographic orientation in textured Baa0.92Ca0.08TiO3 piezoelectric materials
(Journal article; Peer reviewed, 2014)Strongly textured lead-free Ba0.92Ca0.08TiO3 piezoelectric ceramics were fabricated by tape casting and templated grain growth. Dense ceramics with both favorable and unfavorable texture were successfully prepared. Enhanced ... -
Epitaxial (100), (110), and (111) BaTiO3 films on SrTiO3 substrates — A transmission electron microscopy study
(Peer reviewed; Journal article, 2021)Chemical solution deposition (CSD) is a versatile method to fabricate oxide films. Here, the structure and local variations in the chemical composition of BaTiO3 (BTO) films prepared by CSD on (100), (110), and (111) SrTiO3 ... -
High performance multicrystalline silicon: Grain structure and iron precipitation
(Journal article; Peer reviewed, 2017)We report results from a national project about impurities in high performance multicrystalline silicon: Contamination sources, transport routes, interaction with crystal defects and impact on solar cell efficiency parameters. ... -
In-situ structural investigations of ferroelasticity in soft and hard rhombohedral and tetragonal PZT
(Journal article; Peer reviewed, 2015-10-28)Despite the technological importance of hard and soft PZT, Pb(Zr,Ti)O3, ceramics, the mechanisms of ferroelectric hardening and softening remain widely discussed in the literature. The hardening and softening phenomena ... -
Insulating improper ferroelectric domain walls as robust barrier layer capacitors
(Peer reviewed; Journal article, 2021)We report the dielectric properties of improper ferroelectric hexagonal (h-)ErMnO3. From the bulk characterization, we observe a temperature and frequency range with two distinct relaxation-like features, leading to high ... -
Mechanical stability of piezoelectric properties in ferroelectric perovskites
(Journal article; Peer reviewed, 2015)The influence of uniaxial compressive stress on the small signal direct piezoelectric coefficient of hard and soft Pb(Zr,Ti)O3 at the morphotropic phase boundary was investigated as a function of temperature from 25 °C to ... -
Octahedral coupling in (111)- and (001)-oriented La0.7Sr0.3MnO3/SrTiO3 heterostructures
(Journal article; Peer reviewed, 2018)Rotations and distortions of oxygen octahedra in perovskites play a key role in determining their functional properties. Here, we investigate how octahedral rotations can couple from one material to another in La2/3Sr1/3 ... -
Rayleigh analysis of dielectric properties in textured K0.5Na0.5NbO3 ceramics
(Journal article; Peer reviewed, 2014)Grain texturing is a known method of exploiting the intrinsic dielectric and piezoelectric anisotropy in ferroelectric ceramics. However, the role of crystallographic texture on anisotropic extrinsic contributions including ... -
Recombination activity of grain boundaries in high-performance multicrystalline Si during solar cell processing
(Journal article; Peer reviewed, 2018)In this work, we applied internal quantum efficiency mapping to study the recombination activity of grain boundaries in High Performance Multicrystalline Silicon under different processing conditions. Wafers were divided ... -
Special quasirandom structures description of the local structure of disordered Bi0.5K0.5TiO3
(Peer reviewed; Journal article, 2022)Polar nanoregions (PNRs) are believed to play a decisive role in the local and macroscopic polarization in relaxor ferroelectrics. The limited microscopic understanding of the structure and dynamics of PNRs hampers the ... -
Structure and phase transitions in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) from -100 degrees C to 150 degrees C
(Journal article; Peer reviewed, 2013)The solid solution of (x)Ba0.7Ca0.3TiO3-(1-x)BaZr0.2Ti0.8O3 is known to exhibit high piezoelectric constants. Discrepancies in the reported phase transitions and structure around room temperature, however, have complicated ...