Materials Literature
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Abstract Two methods for the determination of oxalic acid were collaboratively studied. In both methods, the oxalic acid in spiked and unspiked spinach is precipitated as calcium oxalate from a buffered (pH 4.0–4.5) solution. The precipitate is separated from the solution by centrifuging 15 min at 1700 rpm. The oxalic…
The enthalpies of formation from Na(s) and WO3(s) of two cubic phase sodium tungsten bronzes. Na0·53WO3(s) and Na0·77WO3(s), have been determined by solution calorimetry. The thermodynamic stability of the cubic phase towards oxidation and disproportionation is discussed.
The reactions occurring during the anodic polarization of tinplate passivated cathodically in a dichromate solution (CDC tinplate) were ascertained by applying Faraday's law to analyses of the oxidation products generated. It was found that a large portion of the CDC passivation film consists of chromium in the metall…
A review of studies of photoconductivity in the ferroelectric-semiconductors SbSI and BaTiO3 is given and the results are discussed. In the short wavelength region of the spectrum there is an “extrinsic” photoconductivity of the ferroelectric due to the effect of the strong surface electric field on the nonequilibrium…
Abstract Die Isomorphiebeziehungen bei den Heptahydratsulfaten von Mg 2+ , Zn 2+ , Ni 2+ , Fe 2+ und Co 2+ werden untersucht. Es wurde festgestellt, daß wenn die Endglieder der betrachteten isomorphen Reihen in gleichen Strukturen kristallisieren, eine lückenlose Reihe der Mischkristalle existiert. Wenn die Endglieder…
Crystals of the title adduct are triclinic, space group P, with a= 14·347 ± 0·004, b= 13·194 + 0·002, c= 9·461 ± 0·001 Å, α= 72·50 ± 0·02, β= 114·70 ± 0·01, γ= 114·12 ± 0·02°, Z= 2. The structure was refined by least-squares methods to R 0·047 for 2829 observed intensities measured by diffractometer. The analysis show…
Results from elevated temperature-strain controlled fatigue and constant-strain-rate tensile tests conducted on specimens of stainless steel Types 304, 304L (titanium modified), 316, as well as Incoloy 800 are reported. Specimens were irradiated to fluences of 0.4 to 5 × 1022 n/cm2, E>0.1 MeV at 700 to 750 C (1…
Enzyme-solubilized collagen was cast into films with different fibrillar structures and cross-linked with glutaraldehyde. Cross-linked films had decreased swelling ratios, decreased degree of hydrolysis, increased resistance to bacterial collagenase, and increased shrinkage temperatures. Subcutaneous implantation in r…
Single crystals of with dislocation and inclusion levels below 5/cm 2 were grown in a nitrogen atmosphere with an infrared television system of computer controlled Czochralski crystal growth. Coring was prevented by a high crystal rotation rate and a slow pull rate during growth, although striations occurred in the cr…
Using room temperature diffractometer intensity data the structure of Rb2TeCl6 has been determined by single crystal X-ray diffraction and refined to a final R of 0·050. The structure consists of regular octahedral [TeCl6]2–[Te–Cl = 2·541 Å(corrected)]. Lattice energy calculations on the resulting structure (for vario…
Ultraviolet high sensitivity reflection spectra of the copper electrode surface have been measured in situ under the potentiostatic polarization in 3% NaCl aqueous solution. In the deaerated nearly neutral 3% NaCl solution containing 0.0002 M BTA (benzotriazole), BTA-Cu (I) (benzotriazole-cuprous salt) film was formed…
Compressive surface stresses were formed in hot‐pressed Al 2 O 3 by quenching. Flexural strength was improved substantially, up to a maximum of 223,000 psi. The variation of strength with grain size of the quenched bodies was similar to that of the unquenched material, but the strengths were shifted to higher values.…
The influence of dislocation behaviour on void formation and growth has been studied in the High Voltage Electron Microscope (HVEM). Variation of the interstitial loop density has been used to control the concentration of biased linear sinks available for point defects, and thereby the vacancy excess required for void…
Abstract The kinetics for dehydrochlorination and benzene formation has been studied during the degradation of two samples of poly(vinyl chloride) (PVC) at 180–200°C under vacuum with and without the removal of hydrogen chloride. The effects of various additives, such as organic phosphites, mercury, silver, gold, and…
The transition temperature and the heat of transition between the hydrate and the anhdrous forms of phenobarbital were determined to be 36.4° and 1.87kcal/mole, respectively by the initial dissolution rate measurements. These values were in good agreement with values obtained by the conventional solubility equilibrium…
Because of the continued escalation of interest in liquid crystals and in their applications in display devices, the efforts of organic chemists have recently been concentrated on the synthesis of better mesogens for technological exploitation. Therefore, although the stability of available liquid crystal materials, t…
The natural analogue of gehlenite hydrate synthesized by Carlson (1964) was found as an alteration product of gehlenite from Fuka, Okayama Prefecture, Japan, and as a crust on wollastonite from Carneal, Northern Ireland. The chemical analyses of the impure Fuka material substantiate the validity of Carlson's formula 2…
The title compound has been shown by X-ray single-crystal study to be isostructural with α-realgar, As4S4. Least-squares refinement of the structure gave R 0·11 for 1008 observed photographic reflections. The far-i.r. spectrum consists of As–Se stretching (205–253) and bending bands (93–135 cm–1). Mean distances: As–A…
Saturation magnetization values and uniaxial anisotropy constants at 20°C, also Curie points and other magnetic transition temperatures are reported for the alloys Sm2(Co1−xFex)17 as a function of x. For x = 0.3–0.7, the 2:17 phase is probably metastable at room temperature. Saturation has a peak of ∼16300 G at x = 0.…
Annealed Zircaloy-2 was exposed to fast neutron fluences in the range 0.46 to 6.71 × 1019 nvt, E > 1 MeV, at temperatures of up to 450°C. The level of radiation hardening, as measured by the change in yield stress after irradiation, increased with irradiation temperature at least up to 380°C. Post-irradiation annealin…