Materials Literature
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A Zr−Ce mixed oxide with ca. a 1:1 atomic ratio is prepared by a microemulsion method and studied by X-ray diffraction, transmission electron microscopy, and Raman, X-ray photoelectron (XPS) and electron paramagnetic resonance (EPR) spectroscopies. The results show the formation of a high surface area material ( S BET…
We show that a simple rate-and-state theory accounts for most features of both time-independent and time-dependent plasticity in a spatially inhomogeneous situation, specifically, a circular hole in a large stressed plate. Those features include linear viscoelastic flow at small applied stresses, strain hardening at l…
We show that the NLS systems with multiplicative noise, nonlinear damping and nonlocal dispersion exhibit a variety of interesting effects which may be useful for modelling the dynamical behavior of one- and two-dimensional molecular systems.
The equilibrium shapes and energies of coherent strained InP islands grown on GaP have been investigated with a hybrid approach that has been previously applied to InAs islands on GaAs. This combines calculations of the surface energies by density functional theory and the bulk deformation energies by continuum elasti…
Using magnetic neutron scattering we characterize an unusual low temperature phase in orthorhombic SrCuO2. The material contains zigzag spin ladders formed by pairs of S=1/2 chains (J=180 meV) coupled through a weak frustrated interaction |J'|<0.1J. At T
The effects of pyrolysis and annealing conditions on the orientation of PZT thin films prepared by Sol-Gel process have been investigated. The influence of the interface behaves between Ti and Pt formed at different heat treatment conditions on orientation of final PZT thin films was emphasized in this paper. The rela…
A fractal-percolation model describing the stability of foam is studied. In this model, a correspondence is established between the system of branched channels and a fractal tree. In the proposed model, the foam breaks down by a scale-invariant load-transfer mechanism. A formula is obtained for calculating the height…
GeTe, SnTe, and PbTe have been prepared by chemical transport reactions with iodine as transport agent in the temperature range between T 2 (800 - 700°C) and T 1 (700 - 500°C). The effective transport equilibria were determineted. Total pressure measurements in the system Ge- Te-I give the coexistence equlibria for co…
Differential scanning calorimetry on powders and x-ray diffraction on single crystals of $({\mathrm{CH}}_{3}{)}_{4}\mathrm{NSCN}$ reveal a cell-doubling cubic-to-orthorhombic ${(O}_{h}^{1}\ensuremath{\rightarrow}{D}_{2h}^{13})$ ferroelastic transition at 181 \ifmmode^\circ\else\textdegree\fi{}C. This transformation is…
The two ternary phases W 5 As 2.5 P 1.5 and Ni 4 Nb 5 P 4 have been investigated by X-ray powder diffraction. Precise data for the two compounds were collected using Cu K α 1 radiation over the range 11°–140° 2θ. Unit cell refinements (space group I 4/ m ) led to a =9.4729(3) Å, c =3.2414(2) Å ( D x =13.16 g cm −3 ) w…
Many transformers using low Tc or high Tc superconductors have been built and tested, but it is still not clear how to design the volt/turn ratio property. This paper shows one design method, which minimizes total cost including initial cost and running cost. According to the results, the optimized volt/turn will be a…
The phase behaviours of mixed liquid crystal systems having either Sm/N or Sm/Ch properties have been studied. The (smectic/nematic) binary system formed smectic phases over a wide and much enhanced range of temperature (42 C) and a broad concentration range (0-90 wt %). The ternary smectic/cholesteric system, in appr…
There is a morphotropic phase boundary (MPB) in the (1−x)(0.6PZN-0.4PMN)-xPT ceramic system when x=0.23. The dielectric and piezoelectric properties are very good for compositions lying near the MPB. After partially substituting Pb with Sr, dielectric and piezoelectric properties are increased apparently. The piezoele…
Neutron powder time of flight diffraction provides a powerful tool for the measurement of the temperature dependence of cation ordering in minerals, including non-convergent ordering. The successful application of the technique to the study of metal cation long range order in olivines and spinels is reviewed, and the…
It is shown for the case of a two-sublattice model of an antiferromagnet with a linear magnetoelectric effect that a new type of surface spin wave can arise at a boundary between a magnetoelectric and a nonmagnetic metal or between a magnetoelectric and a nonmagnetic insulator. This type of surface magnon arises from…
Crystals o f the complex [K (benzo-18-crown-6][Zn(CN) 3 ] H 2 O were obtained from a solution o f Zn(CN) 2 , KCN, and benzo-18-crown-6 in water/methanol. The compound crystallizes in the triclinic space group PI (no. 2),: Z = 2, a = 818,6(5), b = 1236,7(8), c = 1359,6(6) pm, a = 67,02(4), β = 87,38(4), 7 = 75,46(5). E…
BACKGROUND: During the production process of the X-ray contrast agent iodixanol the drug substance may be exposed to acid, base, air, heat and daylight, conditions that may cause decomposition products. OBJECTIVE: To investigate the chemical stability of iodixanol under accelerating conditions. METHOD: Chemometrical s…
Plasma source ion implantation (PSII) is a non-line of sight process for implanting complex shaped targets without the need for complex fixturing. The breakdown initiation of materials coated with diamondlike carbon (DLC) produced by PSII occurs at defects in the DLC, which expose the underlying material, thus establi…
PbZr0.52Ti0.48O3 (PZT)/YBa2Cu3O7−δ (YBCO) structures were fabricated on LaAlO3 and Y2O3-stabilized ZrO2 (YSZ) substrates by a pulsed-excimer-laser deposition method. The total dose effects on the Au/PZT/YBCO ferroelectric capacitors were considered by measuring the capacitance-voltage (C-V) characteristics and the ret…
Abstract Experimental results on gasification behaviors of freely‐falling spent alkylation sulfuric acid droplets in high‐temperature environments are presented, as well as baseline data on evaporation of water droplets and sulfuric acid droplets. Low evaporation constants have been measured for sulfuric acid droplets…