Materials Literature
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Polysulfide electrolyte is the most commonly utilized electrolyte in quantum dot-sensitized solar cells (QDSSCs). Recently, however, a redshift in the relative positions of the absorbance and incident photon conversion efficiencies of CdSe QDs in polysulfide solutions has been reported. We conduct extensive analyses o…
Harmonic analysis in power systems is a challenge that is always evolving due to a constantly changing power grid. Advances in power electronics have led to the installation of many new non-linear power loads, such as power converters, arc furnaces and motor drive systems, which in turn change the existing infrastruct…
The magnetic and dielectric properties under high magnetic fields are studied in the single crystal of Cu3Mo2O9. This multiferroic compound has distorted tetrahedral spin chains. The effects of the quasi-one dimensionality and the geometrical spin frustration are expected to appear simultaneously. We measure the magne…
EuNi 2 P 2 is known as a heavy fermion compound with an electronic specific heat coefficient γ = 100 mJ/(K 2 •mol).This heavy fermion state is based on the Kondo effect as in CeRu 2 Si 2 , revealing an intensive shrinkage of the volume below 100 K in the temperature dependence of thermal expansion.We carried out the p…
We report the electrical resistivity and magnetization of solid solution (Nd 1-x Pr x ) 2 Ir 2 O 7 , where Nd 2 Ir 2 O 7 shows an metal-insulator transition (MIT) at T MI = 33 K and Pr 2 Ir 2 O 7 has no MIT. As x increases, T MI monotonically decreases. For x = 0.90, MIT is observed at 1.3 K. On the other hand, anothe…
Electrical conductivity measurement is technically very difficult to conduct in ultra high magnetic fields over 100 T although it is an important means to investigate properties of materials. In order to overcome the experimental difficulties, we are developing the contactless radio frequency (RF) transmission techniq…
An exact-diagonalization technique on small clusters is used to study the low-energy excitations of the antiferromagnetic Heisenberg model with the ring-exchange interaction. We in particular focus on the one-magnon dispersion relation along the border of the antiferromagnetic Brillouin zone and discuss the role of th…
Synchrotron x-ray absorption spectroscopy of CeRh 2 Si 2 has been performed in pulsed high magnetic fields of up to 32 T. The Ce valence is found to be slightly larger (Ce 3.047+ ) than the trivalent state (Ce 3+ ) at 5 K and decrease by applying magnetic fields higher than 20 T. The magnetic fieldinduced valence decr…
The layered GeSi quantum dots (QDs) are grown on (001) Si substrate by molecular beam epitaxy. The photoluminescence (PL) peak of the as-grown GeSi quantum dots has obvious blue shift and enhancement after processed by ion implantation and rapid thermal annealing. It is indicated that the blue shift is originated from…
We introduce a new numerical method for the solution of self-consistent equations in the cluster mean-field theory. The method uses the density matrix renormalization group method to solve the associated cluster problem. We obtain an accurate critical value of the supersolid-superfluid transitions in the hard-core bos…
Supercritical Carbon Dioxide (S-CO2) is an efficient and flexible working fluid for power production. Research to interface S-CO2 systems with nuclear, thermal solar, and fossil energy sources are currently underway. To proceed, we must address concerns regarding high temperature compatibility of materials and compati…
Atomic reconstruction at the interface of MgZnO and ZnO in molecular beam epitaxy grown heterostructures is investigated. Using secondary ion mass spectroscopy, we experimentally find that Mg atomic reconstruction depends on the polarity of the interface; it is not observed in n-type interfaces (MgZnO on Zn-polar ZnO)…
We present a study of the Fermi surface of KFe 2 As 2 single crystals.Quantum oscillations were observed in magnetostriction measured down to 50 mK and in magnetic fields µ 0 H up to 14 T.For H c, the calculated effective masses are in agreement with recent de Haas-van Alphen and ARPES experiments, showing enhanced va…
Magnetoelectric (ME) effect in multiferroic or ferroelectric/ferromagnetic composite thin films occurs through the elastic coupling between the piezoelectric properties of ferroelectric and magnetostrictive properties of ferromagnetic component. To obtain high elastic coupling and ME effect, we introduced PZT [Pb(Zr0.…
The stability and photoluminescence (PL) emission intensity of quantum dots (QDs) are particularly interesting for various bioapplications. In this paper, monodisperse CdTe/CdS core–shell QDs were synthesized in aqueous phase. The size of CdTe core and the thickness of CdS shell played important roles in the propertie…
ABSTRACT Multiwalled carbon nanotubes (MWCNTs) were melt‐mixed in a conical twin‐screw extruder with a random copolymer of ethylene and tetrafluoroethylene. Surprisingly, the electrical percolation threshold of the resultant composites was quite low; ∼0.9 wt %. In fact, this value is as low or lower than the value for…
The modern energy mix demands a flexible operation with an increased number of fast starts, and this results in enhanced requirements for the steam turbine and its components. Turbine admission valves, which are increasingly operated under instationary conditions to follow the changing power grid requirements, are mai…
This paper discusses a novel approach to calculating inelastic strain that incorporates elastic anisotropy in combination with ANSYS finite element analysis (FEA) software to predict the stress–strain state kinetics of a single crystal (SX) nickel-based turbine blade. The approach is based on using “equivalent directi…
Thermal barrier coatings (TBCs) consist of a multi-layered system where the different layers are deposited to improve the high temperature capability of the underlying substrate material. Substrate materials are usually made of Ni-based superalloys which have an outstanding combination of high-temperature strength, to…
Due to different preparation processes, the microstructure of thermal barrier coatings can be varied. It is important to accurately calculate effective thermal conductivity for the design of thermal barrier. In this work, different microstructures of thermal barrier coatings were reconstructed using the four parameter…