A5013314984- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Ion-surface interactions and analysis
- MXene and MAX Phase Materials
- Advanced materials and composites
- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Advanced ceramic materials synthesis
- Electronic and Structural Properties of Oxides
- Boron and Carbon Nanomaterials Research
- Integrated Circuits and Semiconductor Failure Analysis
- Ga2O3 and related materials
- Metallurgical and Alloy Processes
- Solar Thermal and Photovoltaic Systems
- Silicon and Solar Cell Technologies
- High-Temperature Coating Behaviors
- Analytical Chemistry and Sensors
- Thermal Expansion and Ionic Conductivity
- Bone Tissue Engineering Materials
- Ferroelectric and Negative Capacitance Devices
- Orthopaedic implants and arthroplasty
- Acoustic Wave Resonator Technologies
- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
Aarhus University
2023
Linköping University
2010-2019
Thinfilm (Sweden)
2010-2019
Engineering Associates (United States)
2016
University of Victoria
2010
Uppsala University
2006-2009
Hardness is an essential property for a wide range of applications. However, hardness alone, typically accompanied by brittleness, not sufficient to prevent failure in ceramic films exposed high stresses. Using VN as model system, we demonstrate with experiment and density functional theory (DFT) that refractory VMoN alloys exhibit only enhanced hardness, but dramatically increased ductility. V0.5Mo0.5N 25% higher than VN. In addition, while nanoindented VN, well TiN reference samples,...
Metastable NaCl-structure Ti1 − xAlxN is employed as a model system to probe the effects of metal versus rare-gas ion irradiation during film growth using reactive high-power pulsed magnetron sputtering (HIPIMS) Al and dc Ti. The alloy composition chosen be x = 0.61, near kinetic solubility limit at temperature 500 °C. Three sets experiments are carried out: −60 V substrate bias applied either continuously, in synchronous with full HIPIMS pulse, or only metal-rich-plasma portion pulse. Alloy...
Thermoelectric properties of ScN thin films grown by reactive magnetron sputtering on Al2O3(0001) wafers are reported. X-ray diffraction and elastic recoil detection analyses show that the composition is close to stoichiometry with trace amounts (∼1 at. % in total) C, O, F. We found thin-film exhibits a rather low electrical resistivity ∼2.94 μΩm, while its Seebeck coefficient approximately ∼−86 μV/K at 800 K, yielding power factor ∼2.5 × 10−3 W/mK2. This value anomalously high for common...
Three-body wear is a complex phenomenon occurring when abrasive particles present between two material surfaces. By developing new experimental setup, we systematically study at the contact stainless steel and three different rubbers (TPU, NBR LSR) in slurry environment, i.e. water containing sand particles. Results showed that on both metal rubber pads increases exponentially with sliding speed, while weak correlation was observed applied normal load for given range of load. Wear analysis...
Thin films of 10B4C have shown to be very suitable as neutron-converting material in the next generation neutron detectors, replacing previous predominantly used 3He. In this contribution we show under realistic conditions that are not damaged by irradiation and interactions, which they will exposed many years a detector. 1 μm thick thin were deposited onto Al or Si substrates using dc magnetron sputtering. As-deposited cold beam with fluences up 1.1×1014 cm−2 mean wavelength 6.9 Å. Both...
The authors report the growth and mechanical properties of epitaxial B1 NaCl-structure V1−xWxN/MgO(001) thin films with 0 ≤ x 0.60. Gibbs free energy mixing, calculated using density functional theory (DFT), reveals that cubic V1−xWxN solid solutions ≲ 0.7 are stable against spinodal decomposition separation into equilibrium cubic-VN hexagonal-WN binary phases. show experimentally alloying VN WN leads to a monotonic increase in relaxed lattice parameters, enhanced nanoindentation hardnesses,...
The authors have studied the elastic properties of radio frequency sputtered phase pure, stoichiometric, and dense hydroxyapatite films by nanoindentation. measured modulus values been compared to ab initio calculated data. calculation technique was based on determination all constants. differ ∼10%. good agreement indicates that elasticity can be described using calculations, establishing thereof.
Cr${}_{2}$GeC thin films were grown by magnetron sputtering from elemental targets. Phase-pure was directly onto Al${}_{2}$O${}_{3}$(0001) at temperatures of 700--800 \ifmmode^\circ\else\textdegree\fi{}C. These have an epitaxial component with the well-known relationship Cr${}_{2}$GeC(0001)//Al${}_{2}$O${}_{3}$(0001) and ${\mathrm{Cr}}_{2}\mathrm{GeC}(11\overline{2}0)//{\mathrm{Al}}_{2}{\mathrm{O}}_{3}(1\overline{1}00)$ or...
Electronic-grade GaN (0001) epilayers have been grown directly on Al2O3 substrates by reactive direct-current-magnetron sputter epitaxy (MSE) using a liquid Ga sputtering target in an Ar/N2 atmosphere. The as-grown epitaxial films exhibit low threading dislocation density the order of ≤1010 cm−2 determined transmission electron microscopy and modified Williamson–Hall plot. X-ray rocking curve shows narrow full-width at half maximum (FWHM) 1054 arc sec 0002 reflection. A sharp 4 K...
For applications in energy harvesting and environmentally friendly cooling, for power sources remote or portable applications, it is desired to enhance the efficiency of thermoelectric materials. One strategy consists reducing thermal conductivity while increasing retaining factor. An approach achieve this doping Seebeck coefficient electrical conductivity, simultaneously introducing defects materials increase phonon scattering. Here, we use Mg ion implantation induce epitaxial ScN (111)...
The development, implementation, and demonstration of in-fiber Bragg grating (FBG) sensors for a simultaneous measurement temperature relative humidity (RH) in an operating polymer electrolyte membrane fuel cell (PEMFC) are presented. Etched fiber, polymer-coated FBG with fast response high sensitivity installed situ minimally invasive manner the cathode unipolar plate single PEMFC serpentine flow fields. performance under transient conditions is monitored. Step increases current induce...