Materials Literature
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We performed Synchrotron X‐ray diffraction (XRD) analyses of internal residual stresses in monolithic samples of a newly developed Li 2 O–Al 2 O 3 –SiO 2 (LAS) glass–ceramic produced by sintering and in a commercial LAS glass–ceramic, CERAN ® , produced by the traditional crystal nucleation and growth treatments. The…
Seamless transition: New hybrid fullerene-like nanostructures of MoS2 are comprised of a nanoscale octahedral core with a smooth transition to quasi-spherical outer shells (see picture). The particles were generated by ultra-high irradiance solar ablation and their structures confirmed by modeling studies.
Commercially available alumina powder was consolidated at 1150°C by spark plasma sintering at the heating rate of 100°C/min. The effects of the pressure application mode were examined with respect to microstructure, porosity, and transparency. A finite‐element simulation was developed in order to understand the relati…
We propose a class of semiconducting graphene-based nanostructures: hydrogenated graphene nanoripples (HGNRs), based on continuum-mechanics analysis and first-principles calculations. They are formed via a two-step combinatorial approach: first by strain-engineered pattern formation of graphene nanoripples, followed b…
A resistance of magnesium alloys to surface degradation is paramount for their applications in automotive, aerospace, consumer electronics and general-purpose markets. An emphasis of this book is on oxidation, corrosion and surface modifications, designed to enhance the alloy surface stability. It covers a nature of o…
Rh17S15 has recently been shown to be a strongly correlated superconductor with a transition temperature of 5.4 K. In order to understand the nature of strong correlations we study the effect of substitution of some of the Rh and S atoms by other elements such as Fe, Pd, Ir and Ni on the Rh side and Se on the S side i…
We investigated the electronic structure of layered Mn oxide Bi3Mn4O12(NO3) with a Mn honeycomb lattice by x-ray absorption spectroscopy. The valence of Mn was determined to be 4+ with a small charge-transfer energy. We estimated the values of superexchange interactions up to the fourth nearest neighbors (J1, J2, J3,…
A simple model shows how it is possible to create a gap in the vibrational spectrum of a one-dimensional lattice. The proposed model is a host-guest chain having, instead of point-like masses connected by spring, massive cages hosting particles inside. We imagine the cage as a rigid box containing a mass linked by a s…
Quantum cutting converting a ultraviolet photon into two near-infrared photons has been demonstrated by spectroscopic measurements in NaYF4:Ho3+,Yb3+ synthesized by hydrothermal method. Evidence is provided to confirm the occurrence of quantum cutting. Upon excitation of Ho3+ 5G4 level, near-infrared quantum cutting c…
We investigate various possible definitions of an effective temperature for a particularly simple nonequilibrium stationary system, namely a heated Brownian particle suspended in a fluid. The effective temperature based on the fluctuation dissipation ratio depends on the time scale under consideration, so that a simpl…
We report a direct observation of Ge hut nucleation on Si(001) during UHV MBE. The study was carried out using a UHV instrument coupling MBE chamber and STM which enables the sample study on atomic level at any stage of treatment. Si wafers were deoxidized by annealing at 925C. Ge was deposited by electron beam evapor…
We have used time-resolved x-ray photoemission electron microscopy to investigate the magnetization dynamics induced by nanosecond current pulses in NiFe/Cu/Co nanostripes. A large tilt of the NiFe magnetization in the direction transverse to the stripe is observed during the pulses. We show that this effect cannot be…
Ni-Mn-Ga films in the austenite and the martensite structures at room temperature have been obtained using the DC magnetron sputtering technique. Two elaboration processes were studied. A first batch of samples was deposited using a resist sacrificial layer in order to release the film from the substrate before vacuum…
We calculate the dynamical dielectric function of doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities n 1, n2, respectively, and an interlayer separation of d at finite temperature. The results are used to find the dispersion of plasmon modes and loss functions of DLG for…
Upconversion photoluminescence (PL) of Er(3+)-doped BaTiO3 (BTO) with perovskite ABO3 structure is studied in terms of Er3+ substitutions for Ba (A-) and Ti (B-site) with different Er3+ doping concentrations. PL quenching with an increase Er3+ doping concentration is investigated based on the structural change and ene…
Carbon nanotubes (CNTs) were deposited from a chlorosulfonic superacid solution onto PET substrates by a filtration/transfer method. The sheet resistance and transmission (at 550 nm) of the films were 60 Ω/sq and 90.9% respectively, which corresponds to a DC conductivity of 12,825 S cm(-1) and a DC/optical conductivit…
The phase transitional behavior and composition‐dependent piezoelectric properties of (NaK)(NbSb)O 3 –LiTaO 3 –BaZrO 3 (NKNS–LT–BZ) pseudo‐ternary system were investigated. A composition–temperature phase diagram was generalized within a certain range of BZ content in which a rhombohedral–tetragonal ( R – T ) ferroele…
We show that cubic 8 mol% yttria (8YSZ) can be sintered at 750°C with the application of DC electrical fields; in comparison the lowest sintering temperature for 3YSZ was 850°C. Furthermore, cubic zirconia exhibits the onset of flash sintering at 30 V/cm, whereas 3YSZ begins flash sintering at 60 V/cm. However, the vo…
A novel single-composition white-emitting phosphor Ca 3 Y(GaO) 3 (BO 3 ) 4:Ce 3+,Mn 2+,Tb 3+ has been synthesized by a high-temperature solid-state reaction. The spectral overlap between the emission band of Ce 3+ and the excitation band of Mn 2+, which supports the occurrence of the energy transfer from Ce 3+ to Mn 2…
Part I Materials Science and Raman Spectroscopy Background The sp^2 Nanocarbons: Prototypes for Nanoscience and Nanotechnology Electrons in sp^2 Nanocarbons Vibrations in sp^2 Nanocarbons Raman Spectroscopy: From Graphite to sp^2 Nanocarbons Quantum Description of Raman Scattering Symmetry Aspects and Selection Rules:…