Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
11B- and 10B-containing apatites were prepared from the system CaO-P2O5-B2O3 at 1000°C. The structure of borate groups was investigated by infrared spectroscopy based on isotopic frequency shifts. The boron-containing apatite has both BO2 and BO3 groups, but it does not contain BO4 groups. The BO3 groups occupy PO4 si…
Capillary rise, drop-weight, pendant-drop and ring methods which are originally deve- loped for surface tensions have been adapted to the measurement of interfacial surface tensions. Dropweight method is, however, frequently employed for the purp se. interfacial tensions usually lie between the ’ndividual surface tens…
The use of beryllium as a neutron multiplier for fusion reactor blankets has been analyzed. The analysis has been performed based on designs for a helium-cooled ceramic breeder and a self-cooled liquid-metal blanket, which have both been suggested for the Next European Torus reactor. It is shown that the use of beryll…
The structural change of 11 mol% MgO–ZrO2 by aging has been investigated using the dilatometric, X-ray diffraction and transmission electron microscopic techniques. Above 1413 K, the cubic ZrO2 decomposed to MgO+tetragonal ZrO2 eutectoidically. Below 1413 K, two kinds of decomposition have taken place. One is the prec…
We have investigated the nodular defect using computer simulations and experimental techniques. A modified version of the hard-disk model, in which the migration and attraction of atoms are introduced in simplified ways, is used to simulate the formation and development of nodules. This simulation reveals the self-ext…
New technologies constantly generate new demands for exotic materials to be used in severe environments. The rapid developments of aerospace industries during the last two decades have required new ma
Bi 2 O(SO 4 ) 2 cristallise dans le systeme monoclinique avec le groupe d'espace c2/c. Affinement de la structure jusqu'a 0,069. La structure est constituee d'ions Bi 4 O 2 8+ presque plans et d'ions SO 4 2− relies pour former un reseau tridimensionnel au moyen de fortes liaisons oxygene bismuth-sulfate
The reaction between commercial H2 and uranium metal leads to the formation of UO2 due to traces of water vapour or oxygen. When extremely pure H2 is used uranium hydride may be formed but, even with 99.9999% H2 uranium dioxide forms preferentially. The present work identifies the presence of UH3 in the X-ray photoele…
The core electron binding energies of eighteen compounds containing iodine in different oxidation states ranging from (-I) to (VII) have been measured. The observed chemical shifts differ from the literature data. The anticipated existence of hexavalent iodine in certain compounds has not been demonstrated. The relati…
This research demonstrates procedures useful in measuring the ability of fabrics to block heat transfer when in contact with a hot surface. Experiments show how the temperature of the contacting surface, contact pressure, and fabric moisture content affect protective insulation in conductive tests. Single-layer fabric…
An account is given of a yarn-on-yarn abrasion test developed for use on continuous–filament rope yarns. It involves application of a reciprocating motion to two yarn sections wrapped helically together under tension. Different modes of behaviour were found under more severe and less severe abrasion conditions. Tests…
The Mott formula relating the electron scattering factor to that for X-rays is inaccurate in its numerical form in the small-angle region. Effects of the inaccuracy on both kinematic and dynamical diffraction have been investigated. Some artifacts arising from the inaccuracy have been found in simulated electron micro…
The compound MnCu(obbz)·H2O [obbz = oxamido bis(benzoato)], obtained by reaction of the Mn2+ ion with the copper(II)‘brick’[Cu(obbz)]2–, orders ferromagnetically at Tc= 14 K; below Tc it exhibits a hysteresis loop characteristic of a soft ferromagnet.
A series of critical experiments was performed on single crystal CMSX-3 and equiaxed grain Mar-M246 specimens to identify the mechanisms responsible for the degradation in stress-rupture properties of 0.020 in. thick mini-flats machined from airfoils compared with 0.250 in. diameter standard test bars.
Abstract The requirements for PVC suspension resin have changed considerably in the last few years, so much so that few companies have products on their ranges that are more than 4 or 5 years old. The suspending agent has a crucial influence on the morphology of the resin, so the changes in resin characteristics have…
Abstract The new compound Na 8 SnSb 4 has been prepared from appropriate mixtures of the elements at 700 °C in evacuated silica ampoules coated with glassy carbon. The structure has been determined by single crystal X-ray diffraction data (cubic, space group Fd3m, a - 1481.6(3) pm, Z = 8, R = 0.044 for 263 reflections…
The thermal expansion of Y 2 SiO 5 crystals has been measured for the principal crystallographic directions and two orthogonal directions in the (010) plane in the temperature range 25° to 200°C. This monoclinic crystal has strongly anisotropic expansions with coefficients which range from 0.6 × 10 −6 /°C for [100] to…
The PTC effect in KNbO3, KBiTi2O6, NaBiTi2O6, Pb2FeNbO6, Pb2FeTaO6 having phase transitions of different types (FE-PE, FE-FE and FE-AFE) has been investigated. In oxides possessing both the FE-PE and the FE-FE phase transition, a ρ(T) anomaly, depending on the values of the donor concentration and the surface state de…
Polyphenylene sulfide (PPS) and Polyetherether ketone are high performance engineer ing thermoplastics with a unique combination of excellent thermal, mechanical and en vironmental properties. This paper presents the thermogravimetric properties of PPS and PEEK resins and carbon fiber reinforced composites. The additi…
Abstract The interpretation of soil tests for K in highly weathered soils may be improved if the K buffering power is considered in addition to extractable K. This study was conducted to determine if cation exchange capacity (CEC) and humic matter (HM) should be included in the development of more meaningful K availab…