Materials Literature
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We have studied the variation of the paramagnetic to ferromagnetic transition temperature TC and of the ferromagnetic to antiferromagnetic transition temperature TN as a function of the average size of the A site cations (Ln, Sr) in the manganite perovskites Ln0.5Sr0.5MnO3 (Ln=Gd, Sm, Y, Pr, La). For our investigation…
We study the kinetics of order-disorder and order-order transitions in weakly segregated diblock copolymers using a time-dependent Ginzburg-Landau (TDGL) approach. In particular, we investigate the microstructural change as well as the order-parameter evolution after a sudden temperature jump from one phase to another…
Cyanide-bridged bimetallic assemblies [Ni(pn) 2 ] 2 [Fe(CN) 6 ]X·cat n H 2 O (X = ClO 4 - and n = 2 ( 1 ); X = BF 4 - and n = 2 ( 2 ); X = PF 6 - and n = 2 ( 3 )) and [Ni(1,1-dmen) 2 ] 2 [Fe(CN) 6 ]X· n H 2 O (X = ClO 4 - and n = 2 ( 4 ); X = BF 4 - and n = 3 ( 5 ); X = PF 6 - and n = 2 ( 6 ); X = CF 3 SO 3 - and n =…
High-resolution dilatometry measurements have been made for ${\mathrm{SrTiO}}_{3}$ along the tetragonal-phase a and c axes and the cubic-phase [100] direction between 2 and 280 K. A moderate stress field was used to align the domains of the low-temperature tetragonal phase or to force a single domain. Anisotropy in th…
The lattice parameter of undoped and boron doped polycrystalline diamond films has been measured up to 8×1020 B cm−3. It varies slightly according to the three crystallographic directions [111], [220], and [311] investigated here. The cell parameters for the undoped films are within the published values for synthetic…
The specific heat of Na0.5Bi0.5TiO3 crystal in the temperature range 300–650 K and the changes of spontaneous polarization of Na0.5Bi0.5TiO3 ceramic in the temperature range 4.2–90 K were measured. The calorimetric measurements showed that the anomaly of specific heat exists in the temperature range where the phase tr…
Polyvinylchloride (PVC) films containing different amounts of NiCl 2 have been prepared using a casting method. The UV/VIS (200-800 nm) and IR (200-4000 cm −1 ) spectra and dc electric conductivity have been investigated. One optical absorption edge was found for pure PVC, while the addition of NiCl 2 led to the appea…
Article Hydrogen Solubility and Thermodynamics of Hydrogen Absorption in Palladium-rich Binary Pd1−xZx and Ternary Pd1−x−yZxZ′y Solid Solution Alloys was published on February 1, 1997 in the journal Zeitschrift für Physikalische Chemie (volume 199, issue 2).
Abstract Sulphosalts in the system CuSbS 2 -CuBiS 2 (chalcostibite-emplectite) form a complete solid solution series. Seven compositions with the general formula Cu(Sb x Bi 1– x )S 2 have been synthesized using dry methods at 310°C. All members of the series are orthorhombic (space group Pnma ) and show smoothly incre…
Films of poly(ethylene terephthalate) (PET) have been subjected to a low frequency (70 kHz) helium discharge, with a non-symmetrical configuration of electrodes, in order to study the treatment conditions for which the `ageing' effect is slowed down. Treatments were made for different gas flow rates (40, 70 and 100 sc…
Solid NMR of 13 C isotope-labeled samples of PMR-15 was used to follow the cross-linking reaction of the nadic end cap. Some samples were labeled on one of the carbon atoms of the nadic end cap, and others on the methylene carbon atom of the methylenedianiline portion of the polymer. NMR spectra were run on these samp…
Some alloys containing fine, undeformable, second-phase particles (typically, 25 nm < diameter < 1 μm; 8 nm < interparticle-spacing < 0.5 μm) can display either accelerated or retarded recrystallization depending on the particle dispersion parameters. The recrystallization of a series of such alloys, internally oxidiz…
Rietveld analysis of neutron powder diffraction data on the sanmartinite (ZnWO 4 )-cuproscheelite (CuWO 4 ) solid solution has enabled the comparison of microscopic and macroscopic order parameters associated with the P 2/ c – P \overline 1 structural phase transition. The macroscopic spontaneous strain, calculated fr…
Other| February 01, 1997 Fivefold-coordinated Ti4+ in metamict zirconolite and titanite: A new occurrence shown by Ti K-edge XANES spectroscopy François Farges François Farges Universite de Marne-la-Vallee, Laboratoire de Physique et Mecanique des Geomateriaux, France Search for other works by this author on: GSW Goog…
A surface forces apparatus modified to apply small-amplitude oscillatory displacements in the normal direction was used to measure the drainage of tetradecane (a good solvent) past polybutadiene (PB) brushes end-attached to two opposed mica surfaces. The PB was attached by selective adsorption of the poly(vinylpyridin…
Other| February 01, 1997 The pressure behavior of clinozoisite and zoisite: An X-ray diffraction study Paola Comodi; Paola Comodi Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy Search for other works by this author on: GSW Google Scholar Pier Francesco Zanazzi Pier Francesco Zanazzi Search…
Silicon carbide (SiC) porous substrates, containing alumina (Al 2 O 3 ) dopant levels of 3, 5, and 8 wt%, are prepared by slip casting and sintering in the temperature range of 1450°–1800°C. The linear shrinkage, bulk density, and pore size of the sintered substrate increase as the sintering temperature and the amount…
Novel chemically bonded phosphate ceramics are being developed and fabricated for low‐temperature stabilization and solidification of mixed‐waste streams that are not amenable to conventional high‐temperature stabilization processes because volatiles, such as heavy‐metal chlorides and fluorides, and/or pyrophorics are…
The synthesis and characterization of a novel series of crown ethers based on triethylene glycol (3EO) and the conformationally flexible 1-(4-hydroxy-4‘-biphenylyl)-2-(4-hydroxyphenyl)butane (TPB), i.e. TPB-(c)3EO( z ) (where c stands for cyclic and z = 1−10 is the degree of polymerization (DP) of the cyclic compound)…
Investigations are reported on the dependence of longitudinal ultrasonic attenuation on temperature in tellurite glasses containing vanadium pentoxide with different concentrations. The pulse echo technique was applied at ultrasonic frequencies 2, 4, 6, and 8 MHz, in the temperature range between 100 and 300 K. The re…