Materials Literature
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Various non-180° domain and heterophase structures, observed in relaxor-based (1−x)Pb(Mg⅓Nb⅔)O3 - xPbTiO3 single crystals with various Ti4+ -concentration in a wide temperature range, have been analyzed using the concepts of zero-net-strain planes. The interfaces between the coexisting Pmm, P4 mm and R3 m phases, and…
Slow strain rate testing of solution-annealed (σ0.2 = 552 MPa [80 ksi]) and cold-worked (σ0.2 = 1,068 MPa [155 ksi]) 22%Cr duplex stainless steels (DSS) was conducted at different hydrogen charging currents in acid-brine solutions at 80°C (176°F). The charging currents and environments were designed to simulate coupli…
Investigates the adhesion and corrosion performance of selected silanes in primed galvanised steel. For comparison HDG steel was also treated with a chromate‐free and a chromate‐containing pre‐treatment. All treated panels were painted with three different primers. Corrosion resistance and paint adhesion of the primed…
Abstract The equilibrium between the enol form and the keto form in the triplet state of salicylideneanilines and salicylidenebenzylamines 1 in non-polar solvent has been explored based on the observation of phosphorescence and T–T absorption spectra.
Phase transitions in ferroelectromagnet materials in which a ferroelectric order exists below an antiferromagnetic transition temperature is investigated using Monte-Carlo method, based on a hybrid Ising-DIFFOUR model. The magnetization, electric polarization and their susceptibilities as well as magnetoelectric coupl…
The improvement of medical health care during the past years has led to an increased use of implants. The requirements placed on implant materials are determined by medical progresses and biological demands. Metallic biomaterials are the dominating group of materials for use as highly tension loaded implants. Among th…
In this paper the bulk, surface and interfacial structures of a series of polyureas containing polydimethylsiloxane segments are examined. The silicone polyureas studied here all contain 25 wt% of a 5,000 molecular weight aminopropyl-terminated polydimethylsiloxane diamine, along with various ratios of a 900 molecular…
The kinetics of sorption of atomic hydrogen by pyrolytic, quasi-single-crystal, and RGT commercial-grade graphite was studied. The processes of sorption and subsequent thermal outgassing are shown to proceed in a similar manner for all the three types of graphite. Thermal desorption spectra obtained during linear heat…
SrAl 2 O 4 activated with Eu phosphors has been known to exhibit high brightness and long-lasting phosphorescence without radioactive materials. In this paper, SrAl 2 O 4 :Eu thin films have been successfully deposited on Si(100) or graphite substrates using an intense pulsed ion-beam evaporation technique. The result…
Magnesiumbasiswerkstoffe weisen neben einem der Kortikalis sehr gut angepaßten E-Modul von 45 GPa auch eine hohe physiko-chemische Biokompatibilität durch den essentiellen Charakter des Magnesiums auf. Die Biodegradation von Magnesium-Legierungen kann für temporäre Implantate vorteilhaft genutzt werden. Es wird der Ko…
The Brillouin and Raman scattering from a complex single crystal from the tungsten–bronze family, (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6 doped with Cu2+ (KNSBN:Cu), have been comparatively studied in a wide temperature range around the ferroelectric transition. Step-like anomalies in hypersonic velocity and damping conf…
In this paper, a theoretical model proposed in Part I (Zhu et al., 2001a) is used to simulate the behavior of a twin crank NiTi SMA spring based heat engine, which has been experimentally studied by Iwanaga et al. (1988). The simulation results are compared favorably with the measurements. It is found that (1) output…
Abstract The alteration process of a subvolcanic rock with calcic plagioclase, pyroxene, and olivine as major components was investigated by X-ray diffraction (XRD) and analytical and transmission electron microscopy (TEM/AEM). Experimental interaction with 1 M NaOH solution led to the formation of dioctahedral beidel…
Triphenylamines with thienyl groups are electro-oxidatively polymerized to yield the corresponding branched polymers on an electrode. The resulting polymers show significantly better redox properties, such as redox activity, catalytic activity, and conductivity when compared with for example the linear polymeric analo…
Complete structural analysis of a Mo bicrystal containing a Σ = 3, [101](121)A grain boundary (GB) was achieved by means of transmission electron microscopy from the microscopic to the nanoscopic level. Secondary GB dislocations compensating a small deviation from the exact Σ = 3 concidence were observed and their cha…
Several Co−Ni−Mg−Al-layered double hydroxides (LDH) have been synthesized by coprecipitation at constant pH = 9. All samples present well crystallized, layered structures, no excess phases were detected by X-ray diffraction, and the lattice a parameter followed the Vegard correlation. The cations thus belong to the sa…
Lead magnesium niobate (Pb(Mg 1/3 Nb 2/3 )O 3 , or PMN) is a relaxor ferroelectric with many potential applications. As a relaxor ferroelectric, PMN displays a diffuse phase transition and its temperature of maximum relative permittivity ( T m ) shifts to higher temperatures as the frequency increases. When 10 mol% of…
Various compositions of the ZrO2/Nb2O5 system were synthesized and the experimental conditions for obtaining reproducible results were established. The gel was precipitated at constant pH = 10, aged at room temperature for 18 h and, after filtration, dried at 110 °C for 24 h. The phase diagram of the ZrO2/Nb2O5 system…
Excitation of Tm 3+ to 3 H 4 using the 791 nm pump source showed the frequency up‐converted blue emission (∼480 nm) due to the Tm 3+ : 1 G 4 → 3 H 6 transition in Tm 3+ /Nd 3+ codoped CaO·Al 2 O 3 glasses. Intensity and lifetime changes with rare‐earth concentrations suggested the efficient energy transfer of Tm 3+ :…
An Al-Ni-Co pentagonal quasicrystal, showing electron diffraction patterns with pentagonal symmetry and including so-called superlattice reflections, has been examined by the high-angle annular detector dark-field technique with scanning transmission electron microscopy. Columnar clusters with a pentagonal arrangement…