Materials Literature
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Single crystals of Ca 3 (VO 4 ) 2 with diameters up to 25 mm and lengths of 60 mm have been grown by the Czochralski technique from a stoichiometric melt. Elastic, thermoelastic, piezoelectric, linear electrooptic, dielectric and pyroelectric properties have been measured. Ca 3 (VO 4 ) 2 exhibits much smaller elastic…
Treatment of the phaeofarnesins (4) isolated from the Chlorobium chlorophylls-660 (ex. Chloropseudomonas ethylicum) with sulphuric acid in methanol gives the methyl phaeophorbides (1) which can be dehydrated by refluxing in benzene in the presence of acid to afford the 2-vinyl derivatives (2); prolonged refluxing give…
Procedures are described for the quantitative determination of the asbestos and α-quartz contents of bulk samples by use of X-ray powder diffractometry. The method gives satisfactory results for several different types of asbestos and for mixtures of two or more different types. Problems with sample grinding and prefe…
Electron microscopy observations show that in the ordered alloy Ni 3V, perfect 1/ 2[112] dislocations are dissociated into three 1/ 6[112] partial dislocations bounding an intrinsic-extrinsic pure stacking fault pair (i.e. without any wrong first neighbour bonds); from this an evaluation of stacking fault energies can…
Polystyrene without additional compounds was treated in a laboratory oven at elevated temperatures (200 degrees, 350 degrees, 500 degrees C) under slight air flow (0.7 l/min). The thermal degradation products appearing in different phases (gases, vapors, aerosols) were collected and analyzed by methods of chromatograp…
A variety of configurations of coupled dislocations straddling a polygon wall were revealed by the etch hillock technique on the (001) surface of white tin. Observations indicated that: (1) Both coupled dislocations and wall dislocations move to the same [100] direction under an applied stress; (2) Their slip plane is…
The intensities of 90 normal and 93 satellite x-ray reflections of the modulated intermediate phase of NaNO2 were measured 0.2 K. above the Curie temperature. The least agreement between the observed and calculated structure factors has been obtained by assuming that the antiferroelectric phase of NaNO2 is both amplit…
The nature of recent international research collaboration is described. Breakdown data obtained on a wide variety of air clearances are comprehensively summarised; the effects of the polarity and shape of the testing impulse, the geometry of the electrodes and the condition of the atmosphere are considered separately.…
Abstract Studies were carried out to determine the crystalline elastic modulus E 1 along the chain axis for the α‐form of nylon‐6 [poly(ε‐caprolactam)] by X‐ray diffraction. To obtain an inherent E 1 value of this polymer the problem was solved that different orders of meridional reflections give different E 1 values.…
Solutions apparently containing Ni[C 6 F 5 ) 2 are obtained by reaction of anhydrous NiBr 2 with [C 6 - F 5 ]MgBr in THF. The addition of different ligands to these solutions gives four-coordinate nickel(II) complexes of the type (C 6 F 5 ) 2 NiL 2 [L = PEt 3 PBu 3 , PPh 3 AsPh 3 SbPh 3 , OPPh 3 OAsPh 3 , p-Dioxane].…
Sliding friction experiments were conducted with pyrolytic boron nitride in sliding contact with itself and various metals. Auger emission spectroscopy was used to monitor transfer of pyrolytic boron nitride to metals and metals to pyrolytic boron nitride. Results indicate that the friction coefficient for pyrolytic b…
Abstract Untersuchungen der Lochfraßbeständigkeit einer großen Anzahl von Zr‐Legierungen in verschiedenen Lösungen durch elektrochemische Methoden ergaben, daß durch Zusätze von Va‐ und VIa‐Metallen, vor allem aber von Ti, die Lochfraßanfälligkeit des Zr vermindert werden kann. Lokalelementbildende Metalle verschlecht…
Abstract The dielectric constant ϵ′ and the dielectric loss ϵ″ for cellulose fiber were measured over a frequency band 0.2 to 10 Mc/sec and a temperature range from −20 to 80°C. Also, the variation of the dielectric behavior with relative humidity was measured at 25°C. From these data, both the specific resistivity R…
Chemisorption of oxygen on the surface of the grains of ZnO powder layers mainly controls the photoconductivity. The adsorption of oxygen ions is regarded as a chemical reaction at the interface and involves oxygen from the gas atmosphere and electrons from the metal oxide. The changes in the conductivity of ZnO-layer…
A study has been made of the effect of hydrostatic pressure, ranging from 1 to 300 atm. (0·102 to 30·6 N.mm−2) on the corrosion of copper in sea water at pH 7·8 and at a temperature of 10°c. The experimental technique ensured that the content of dissolved oxygen in the sea water was virtually constant over the pressur…
The properties of an even homologous series of alkoxy benzoic acids have been investigated in the crystalline and mesomorphic states by means of thermal microscopy, x-ray scattering and dilatometry. Structural parameters such as inter-lamellar distance d, and the molar volume Vm were studied as a function of the numbe…
A decorated lattice gas model is described which exhibits a transition from the phase-separated to the homogeneous state as the concentration of a surfactant is changed, in agreement with observed microemulsion behaviour. The model also has ordered mesophase regions for suitable concentrations. When direct surfactant…
The equations of motion of a nearly spherical bubble immersed in an incompressible and viscous liquid are deduced using the Lagrangian procedure with a dissipation function. The results appear valid for only slightly viscous liquids.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecontamination of Alkaline Radioactive Waste by Ion ExchangeJ. R. WileyCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 1, 67–71Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1 January 1978https://pubs.acs.org/d…
AlNとAl2O3の混合粉末をホットプレスして得た27R及び21 R-pseudo-polytype及びスピネル型のoxynitrideの熱伝導率を測定し, それぞれ0.015, 0.013, 0.026cal/cm・s・K (300K) であった.アルミナを各種温度で還元・窒化した酸素含有量の異なるAlN粉末を用い, 酸素含有量並びにホットプレス条件の熱伝導性に及ぼす効果について検討した. 熱伝導性は不純物酸素量の増加によって著しく劣化するとともに, 焼結温度によっても影響される. AlN微粉末の表面は一般に非晶質の酸化物で覆われているが, 1200℃以上で非晶質層からコランダムが析出する. コランダムは1650℃以上ではAlN…