Materials Literature
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A thermodynamic theory is used to calculate the dielectric properties of epitaxial thin films grown on cubic substrates imposing biaxial tension on the film prototypic cubic state. For such “tensile” substrates, the theory shows that, in a conventional plate–capacitor setup, the films should display only a monotonic v…
The formulation consisting of 300ppm 1‐hydroxyethane‐1, 1‐diphosphonic acid (HEDP) and 50ppm Zn2+ offered 99 per cent inhibition to the corrosion of mild steel immersed in neutral aqueous environment containing 60ppm chloride. This formulation functioned as a mixed inhibitor. The protective film was found to be lumine…
Selected-area electron diffraction (SAED) combined with experimental and computed high-resolution transmission electron microscopy (HRTEM) images were used to investigate polytypism, stacking disorder, mixed layering, and vacancies in chlorites from subgreenschist facies outcrops of the Taveyanne Sandstone from the He…
The energy of phonon modes in the \ensuremath{\beta} phase of AgI is estimated from the phonon modes of the \ensuremath{\gamma} phase since the Brillouin zone (B zone) of the former phase can be obtained by folding that of the latter. The idea of folding the Brillouin zone is extended to other binary and ternary super…
Neutron diffraction and small-angle scattering on La 1 − x Sr x CoO 3 (0 < x ⩽ 0.30) show that for x = 0.3 the system is near a two-phase percolation threshold and undergoes a transition from itinerant to polaronic conduction at the Curie temperature T C . The stabilization of superparamagnetic clusters on warming thr…
Durable press finishing processes are commonly used in the textile industry to pro duce wrinkle-free cotton fabrics and garments. Crosslinking cellulose increases wrinkle resistance and reduces the mechanical strength of treated cotton fabric. Wrinkle recov ery angle (WRA) and tensile strength are the two most importa…
The reaction with sodium cyanide of the μ-oxo-bridged complex of tetra-4-tert-butyl-substituted iron phthalocyanine (form ‘690’) and that of the product of its treatment with organic bases such as Py, Im, etc. (form ‘627’) result in the formation of the same ferrous bis-cyanide complex Na 2 [ Pc t Fe II ( CN ) 2 ] whi…
The Judd–Ofelt parameters, Ω 2 and ΣΩ λ (λ= 2, 4, 6), for Nd 3+ , Ho 3+ , and Er 3+ doped in the oxyfluoride glass 30PbO70PbF 2 lie intermediate between fluoride glasses and oxide glasses such as borate and phosphate glasses, providing evidence for the sensitivity of these parameters to the bonding environment. The va…
Presented here are the results from a series of experiments in which dissimilar metals welds were made using the gas tungsten arc welding process with pure argon or argon-6% hydrogen shielding gas. The objective was to determine if cracking near the fusion boundary of dissimilar metal welds could be caused by hydrogen…
On example of domain walls in α quartz we demonstrate a deduction of wall symmetry and its use in examining the existence of spontaneous polarization in domain walls. We compare these predictions with results of phenomenological theory. Then we present brief summary of a systematic analysis of possible appearance of s…
The classical Blake threshold indicates the onset of quasistatic evolution leading to cavitation for gas bubbles in liquids. When the mean pressure in the liquid is reduced to a value below the vapor pressure, the Blake analysis identifies a critical radius which separates quasistatically stable bubbles from those whi…
In this paper we show that molecular dynamics simulation results for contact-line motion can be accurately reproduced by fully continuum simulations. The problem considered is flow of two immiscible fluids in a two-dimensional channel. Molecular dynamics is used to capture correctly the contact-line dynamics from basi…
A phenomenological theory that describes the phase transitions from a liquid of achiral molecules to the periodic antiferroelectric mesophases is presented. The transitions are shown to be driven by the vector-wave condensation mechanism. Resulting ordered phases have the structure of a vector wave with linear, circul…
Vanadium oxide thin films were prepared by chemical vapor deposition using as precursors a series of vanadyl complexes of general formula , where L is a β‐diketonate ligand. The depositions were carried out on substrates in , , and atmospheres. In order to elucidate the role played by different ligands and synthesis c…
The thermal oxidation of silicon is normally considered to occur via two different routes. At higher O 2 pressures and lower temperature SiO 2 (s) film growth occurs ("passive" oxidation), while at lower O 2 pressures and higher temperature SiO(g) is desorbed in an etching process ("active" oxidation). We have measure…
Crack‐free, undoped PbTiO 3 ceramics were fabricated successfully using sol–gel‐synthesized powder prepared from chelated titanium alkoxide and lead acetate. The sintered ceramics, 8.3 mm in diameter and 6–8 mm thick, were 96% dense. In the present study, PbTiO 3 ceramics with excess lead (Pb:Ti = 1.1:1.0) had large g…
We have fabricated a new magnet with nominal composition of Sm(CobalFe0.1Cu0.078Zr0.033)8.3, which has a room temperature intrinsic coercivity Hci of 40 kOe and a saturation magnetization Ms of 92 emu/g. The new magnet has a temperature coefficient of intrinsic coercivity β(RT−773 K)=−0.15%/K and a high intrinsic coer…
One method for influencing the polarization of light is the use of wire-grid polarizers. For the visible region, this type of element can be realized as a metal-stripe grating with periods less than the wavelength. We fabricate metal-stripe gratings with periods down to 190 nm in thin chromium layers of 35-nm thicknes…
Molecular-crystal precursor states: Molecular dynamics in the nanosecond timescale shows how acetic acid molecules aggregate (see figure for one example) out of a solution in a nonpolar solvent. Is this demixing into a microemulsion the first stage of crystal nucleation?
Abstract A new method is proposed for applying the chlorite geothermometer using X-ray diffraction (XRD) data. A linear correlation has been found between the (001) basal spacing of chlorite and its “crystallization” temperature. The basal spacing values were corrected for an increase of Al(IV) with Fe enrichment (Fe/…