YVO4:Eu,Tb—An Efficient High Pressure Mercury Vapor Lamp Phosphor
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A single point method for evaluating the specific surface area of a solid from nitrogen adsorption isotherms
Abstract A method which allows the rapid and accurate determination of specific surface area for materials from a single point on the nitrogen adsorption isotherm is described. The calculation is made from a single adsorption point which can lie almost anywhere on the isotherm. The method does not suffer from the theo…
Magnetic Properties of MnBi Single Crystals
We have succeeded in growing single crystals of MnBi which are essentially free of excess bismuth. We report here on magnetization measurements on such single crystals from 4.2 K to 635 K in magnetic fields up to 21 kOe using a vibrating sample magnetometer. The magnetization at 4.2 K is 3.84±0.03 μB/Mn atom and is pe…
Diffusion du zinc dans les joints de flexion symétriques de l'aluminium
Under the experimental conditions employed, and especially for highangle grain boundaries, the penetration distance, the diffusion coefficient and the activation energy for the diffusion of zinc along tilt boundaries in aluminum strongly depend on the misorientation. For a given boundary, the previously mentioned quan…
Ellipsometric Study of the Plasma Oxidation of Tantalum
We have shown that it is possible to grow a uniform Ta oxide film up to a thickness of 1500Å by plasma oxidation. The average speed of growth was 0.1 Å/sec, which is comparable to earlier studies. Our experiments show that there is no significant contamination of the oxide due to sputtering from the cathode and that t…
High field magnetostriction in a meta-magnetic FeRh alloy
Measurements have been carried out of the parallel and perpendicular magnetostriction of a polycrystalline equi-atomic FeRh alloy. Measurements were made in pulsed magnetic fields up to 15 T in the antiferromagnetic phase and at the antiferro-ferromagnetic transition induced by the field. The perpendicular antiferroma…
The Growth of Oxide Single Crystals
With new techniques of crystal growth new problems have been encountered with the platinum apparatus used in crystal production. Some of these difficulties are discussed in this paper, including attack by bismuth oxide, Bi 2 O 3 , and dissolution of the platinum in the leaching acids, together with methods of prolongi…
Various Mechanical Tests Used to Determine the Susceptibility of Metals to High-Pressure Hydrogen
The use of hydrogen as a rocket fuel has been successfully established; however, it has also been established that many metals are degraded in one or more of their properties by environmental gaseous hydrogen. The degree of degradation may range from slight to extreme, depending on the metal being analyzed and the typ…
Electromagnetic Interference in Impulse Measuring Systems
High-impulse current and voltage measurement in high-voltage technology and plasma physics is generally accompanied by high-level electromagnetic interference. This paper gives an analysis of various avenues of conducted and radiated interference entry showing that cable braid and cabinet currents represent major sour…
Cathodoluminescence of tin oxide doped with terbium
Single crystals of tin oxide (SnO 2 ) have been grown by a vapour-phase transport method and subsequently doped with terbium ions. The cathodoluminescence of these crystals has been measured at room temperature (300 K). The spectra comprise the intrinsic emission band of the host lattice and bands due to the presence…
Electron Microscopy Study of Stress-induced Acicular γ′ Martensite in Cu–Al–Ni Alloy
Stress-induced acicular martensites in Cu-14.2Al-4.3Ni (wt%) alloy were investigated by means of transmission electron microscopy and selected area electron diffraction method. As a result acicular γ′ martensites were found beside numerous β1′ martensites reported previously, although the occurrence was quite rare. Th…
High-spin iron( II ) chelate complexes with β-diketonate and Schiff base ligands: Mössbauer and electronic spectra
A number of high-spin iron(II) chelate complexes with some bidentate monoanionic ligands (β-diketonates, salicylaldehydate, and N-alkylsalicylideneiminates) and the quadridentate dianion NN′-ethylenebis(salicylideneiminate), and its analogues, has been studied by means of Mössbauer and electronic spectroscopy. In all…
The Temperature Sensitivity of the Selective Reflection by Cholesteric Mesophases and Its Possible Limitations
The selective reflectance of S-cholesteryl 14-phenyltetradecanethioate was determined as a function of the wavelength and temperature at several constant values of temperature and wavelength respectively. The dependence of wavelength λp measured at maximum selective reflectance on temperature T could be curve fitted w…
Tellurium containing ferroelectrics: X-ray data, dielectric properties, phase transitions
A number of the Te-containing perovskites compounds have been studied. It has been established that some of them are either ferro-, ferri or antiferroelectrics. The influence of the different factors on the Curie temperatures is analysed. A tentative conclusion about the principal role of the Te6+-sublattice vis-a-via…
Temperature and frequency dependence of piezoelectric and electrostrictive properties of AgNa(NO2)2
By the use of a quasi-static method the complex piezoelectric constant d22 of AgNa(NO2)2 has been measured over a temperature range -100°C ∼ 38°C and a frequency range 10 Hz ∼ 20 kHz. It was found that d22 shows a dispersion of Debye type, d22 =d∞ + (do - d∞)/(1 + iwr), where the relaxation time τ coincides with that…
Formation of the blue trisulphur radical anion, S 3 – , in solutions of alkali polysulphides in dimethylformamide, and from elemental sulphur and piperidyl-lithium in hexamethylphosphoramide
I.r. and visible spectra identify the blue species in solutions of alkali polysulphides in dimethylformamide (DMF) as S3–. Elemental sulphur (S8) is reduced to S3– by secondary amines in hexamethylphosphoramide (HMPA). The reaction of piperidyl-lithium with S8 in HMPA has been investigated to determine the stoicheiome…
Self‐assembly of collagen
Abstract The structure and self‐assembly of collagen and procollagen molecules are reviewed. The registration peptides of procollagen have specific recognition properties which assure (1) selection of component polypeptide chains and (2) registration of their N‐termini, facilitating orderly folding into a collagen hel…
Equiatomic Ternary Phases in the Alloys of the Rare Earths with Indium and Nickel or Palladium
Article Equiatomic Ternary Phases in the Alloys of the Rare Earths with Indium and Nickel or Palladium was published on January 1, 1974 in the journal International Journal of Materials Research (volume 65, issue 1).
Mechanical Properties of 3BaO·5SiO 2 Glass‐Ceramics
Flexural strengths, elastic moduli, and fracture energies of 3BaO·5SiO 2 glass‐ceramics with a variety of microstructures were determined. Flexural strength depends on the size of spherulites in the microstructure and on the amount of glassy phase remaining in the material. Higher strengths were achieved in glass‐cera…
Plane Lattice Structure in Amorphous Region of Cellulose Fibers
セルロース繊維を濃厚AcOK水溶液で処理し,付着AcOKを洗浄除去後80℃で乾燥するとセルロースの(010)に相当する位置に新しい子午線干渉。が出現する。乾燥温度を高くするにしたがいIoは9.5Aの面間隔をもつ一次層線干渉Iiへ次第に変わっていく。これらの干渉は完全なセルロースの干渉のほかに付加的に出現するもので,処理によってセルロースの結晶化度はまったく変わっていない。したがって新干渉は非晶領域に生じたセルロースAcOK付加物によるものと考えられる。カリウムセルPtを酢酸で洗浄することにより,より完全なセルロース-AcOK付加物のX線図を得た。これから付加物の単位胞を求め,11は(110)に指数付けされた。非晶域に生成した付加物…