Materials Literature
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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…
A superplastic β‐SiAlON was used as an interlayer to diffusionally bond a hot‐pressed silicon nitride to itself. The bonding was conducted in a graphite furnace under a constant uniaxial load of 5 MPa at temperatures varying from 1500° to 1650°C for 2 h, followed by annealing at temperatures in the range of 1600° to 1…
Convergent‐beam electron diffraction has been used to determine the space groups of β‐ and γ‐Zn 3 (VO 4 ) 2 particles in vanadium oxide‐doped zinc oxide varistors. The crystal structure of β‐Zn 3 (VO 4 ) 2 has been determined to be monoclinic with space group P 2 1 and lattice parameters of a = 9.80 Å, b = 8.34 Å, c =…
We have found that the structure of an Al-Ni-Co decagonal quasicrystal, which shows a diffraction pattern with many superlattice reflections (called a 'type I superlattice'), can be described as an ordered arrangement of two kinds of atomic columnar cluster with different orientations of their pentagonal symmetry. The…
Shape Memory Alloy (SMA) can be easily deformed to a new shape by applying a small external load at low temperature, and then recovers its original configuration upon heating. This unique shape memory phenomenon has inspired many novel designs. SMA based heat engine is one among them. SMA heat engine is an environment…
The crystallization kinetics, electrical and optical properties of as-prepared and annealed GexSb40—xSe60 (22.5 at% ≤ x ≤ 32.5 at%) chalcogenide system have been studied. The kinetic studies using differential scanning calorimetry technique and X-ray diffraction examinations revealed that all the considered glasses ca…
Creatine kinase (CK) catalyses the reversible transfer of the phosphate moiety from phosphocreatine (PCr) to ADP, generating creatine and ATP. The crystal structure of a cytosolic brain-type creatine kinase is reported at 2.3 A. The biological dimer sits on a crystallographic twofold axis. The N-terminal residues of b…
Analysis of the atomic arrangement in anhydrous aminoguanidinium hexafluorozirconate, CN 4 H 8 ZrF 6 , reported by Bukvetskii, Gerasimenko & Davidovich [ Koord. Khim. (1990), 16 , 1479–1484], led to the prediction that it is a new ferroelectric [Abrahams, Mirsky & Nielson (1996). Acta Cryst. B 52 , 806–809]. I…
Electron paramagnetic resonance (EPR) room‐temperature observation of trivalent titanium in sol–gel titania has been reported. This unprecedented detection of stable paramagnetic signals in this titania, which was treated at 200°–800°C, occurred regardless of whether the atmosphere was reducing, inert, or oxidating. T…
The microstructural evolution and mechanical properties of Si 3 N 4 –SiC composites obtained by the sinter–post‐HIP process were investigated. SiC addition prohibited β‐Si 3 N 4 grain growth; however, the grain growth followed the empirical growth law, with exponents of 3 and 5 for the c ‐ and the a ‐axis directions,…