Materials Literature
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Dilute magnetic semiconductor GaN with a Curie temperature above room temperature has been achieved by manganese doping. By varying the growth and annealing conditions of Mn-doped GaN we have identified Curie temperatures in the range of 228–370 K. These Mn-doped GaN films have ferromagnetic behavior with hysteresis c…
The creep failure operating mechanisms of a 17‐mm thick plate of a Ti–6Al–4V alloy in various heat treating conditions have been investigated. Specimens in the as‐received, mill‐annealed, condition (50 min maintenance at 720 °C and air cooled as the final step of the thermomechanical process) showed the lowest creep r…
This study compares the efficacy and safety of gadoteridol with that of gadopentetate dimeglumine for enhanced MRI in subjects with intracranial lesions. A total of 92 subjects at three European centres underwent one MRI study enhanced with 0.1 mmol/kg gadoteridol and another with 0.1 mmol/kg gadopentetate dimeglumine…
The dynamics of real magnets is often governed by several interacting processes taking place simultaneously at different length scales. For dynamical simulations the relevant length scales should be coupled, and the energy transfer accurately described. We show that in this case the micromagnetic theory is not always…
Constitutive equations are derived for the time-dependent behavior of particle-reinforced elastomers at isothermal loading with finite strains. A rubbery polymer is modelled as a network of macromolecules bridged by junctions which can slip with respect to the bulk material under straining. A filled elastomer is thoug…
A modified least-squares analysis is presented that allows reliable structural parameters to be extracted from a powder diffraction pattern even in the presence of a substantial unmodelled impurity contribution. The algorithm is developed within the context of Bayesian probability theory. Experimental points that fall…
X-ray diffraction experiments were carried out to prove that X-ray methods can be used to assess strain-induced fatigue in CuAlBe shape-memory alloys. The pseudoelastic fatigue behaviour of CuAlBe single crystals presents a strong decrease of the critical stress of the martensitic transformation. During the fatigue te…
A new implementation of the program MCGR [Pusztai & McGreevy (1997). Physica B , 234 – 236 , 357–358] for the calculation of pair distribution functions from neutron total scattering data using an inverse Monte Carlo algorithm is presented. The new implementation, called MCGRtof , incorporates the resolution funct…
The practical aspects of a recently deduced formalism for the direct solution of the powder diffraction pattern of a layer crystal are addressed. It is shown that the obtained solution is particularly well suited to combination with a deconvolution procedure based on a series development of the peak profile. The influ…
Large ordered arrays of gold nanoparticles with 1.4 nm cores were created in Langmuir monolayers from an amphiphilic starting material, Palmitoyl Nanogold. Transfer of the films to transmission electron microscope grids by the Langmuir−Schaeffer method resulted in observation of highly ordered hexagonal arrays larger…
Density functional theory with the 6-31G* basis set and the BYLP nonlocal exchange-correlation functional has been used for the normal coordinate calculations of the neutral, radical anion, and dianion species of p -terphenyl to p -sexiphenyl. The bands attributed to negative polarons and negative bipolarons in the re…
The crystal structures of isostructural 2,6-naphthalenedicarboxylate tetrahydrate salts of nickel(II) and cobalt(II) have been determined using Monte Carlo simulated annealing techniques and laboratory X-ray powder diffraction data. These compounds crystallize in the triclinic space group P \bar{1}, with Z = 2; a = 10…
As a new application of hydrotalcite-like compounds, sulfate-functionalized carbon/metal-oxide nanocomposites have been prepared at relatively low temperatures in a single step, in which interlayer sulfonated polymeric anions are catalytically converted to the nanocarbons (secondary phase) while CoAl-containing brucit…
Much of crystallography is concerned with the accurate location of the centre of diffraction peak profiles. Simple analytical expressions are derived for estimating the precision of diffraction peak location that can be achieved for Gaussian diffraction peaks with a flat background, in terms of the standard deviation,…
A method for the preparation of arborescent polystyrenes based on acetyl coupling sites is described. The acetyl functionalities are randomly introduced on the grafting substrate by reacting polystyrene with acetyl chloride in the presence of anhydrous AlCl 3 in nitrobenzene. Anionic polymerization of styrene with sec…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTChirality-Transfer Control Using a Heterotopic Zinc(II) Porphyrin DimerYuji Kubo, Takamoto Ohno, Jun-ichi Yamanaka, Sumio Tokita, Takeaki Iida, and Yoshihiro IshimaruView Author Information Department of Applied Chemistry Faculty of Engineering, Saitama University 255…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCooperativity in the Crystalline α-Relaxation of PolyethyleneJoão F. ManoView Author Information Polymer Engineering Department, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal Cite this: Macromolecules 2001, 34,…
Two polynuclear copper(II)-squarate compounds of formulas [Cu(HBIP)(BIP)](C(4)O(4))(1/2).2H(2)O (1) and [[Cu(BIP)(OH(2))](4)(mu-C(4)O(4))](ClO(4))(2).4H(2)O (2) (HBIP = 3,3-bis(2-imidazolyl)propionic acid) have been synthesized and characterized by single-crystal X-ray diffraction. Both compounds crystallize in the tr…
A morphological study of three I 5 S six-arm miktoarm star block copolymers is presented. These miktoarm stars are comprised of five arms of polyisoprene (PI) and one arm of polystyrene (PS) joined together at a single junction point. The strong segregation limit theory for the morphological behavior of miktoarm stars…
Deviations of the coordination arrangement of vanadyl complexes from a regular square pyramid are thought to influence, among other things, their biological function. Such structural distortions have been found to be reflected characteristically in EPR spectra (Cornman et al. Inorg. Chem. 1997, 3 66, 6401). In this wo…