Materials Literature
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The far-infrared spectra of thin films of PH4Cl and PD3Cl have been recorded at −170°C. Raman spectra of polycrystalline samples of both compounds were also recorded at −170°C. One libration and three translations were observed as well as eight internal modes. Several combinations and overtones were assigned and the z…
Some relationships between crystal textures and their permanent magnet properties are reviewed on the basis of a homogeneous uniaxial anisotropic ferromagnet and a mosaic grain agglomerate in the commercial size of an Alnico 8 alloy. From the results obtained, it has been concluded that the highest energy might be obt…
Solutions of N 2 O in liquid formamide (dielectric constant 109) gave a yield of N 2 during γ-radiolysis of G(N 2 ) = 3.3 ± 0.3. Competition between N 2 O and other scavengers, including water, ethanol, acids, AgNO 3 , and CdI 2 strongly resembled the pattern of reactivity characteristic of solvated electrons found in…
The paper reviews the development and application of tungsten halogen lamps since their first introduction. The halogen cycle is described and the advantages of using bromine compounds in the fill gas of some halogen lamps are indicated. Many problems have arisen from the use of halogens; the ways in which these have…
The energy distribution of electrons in a part of the electron beam selected by two apertures situated on the axis was measured using a wienfilter-type energy analyser. These measurements gave brightness values for electrons in specific energy intervals of the distribution which fitted the theory extremely well. The i…
Single crystals of Al 2 O 3 (sapphire) were grown from PbO‐PbF 2 and MoO 3 ‐PbF 2 fluxes; they varied from flat plates (PbF 2 ‐rich melts) to equidimensional crystals (PbO‐ or MoO 3 ‐rich melts). The primary growth planes are basal {0001}, first‐order rhombohedral {1011}, and second‐order rhombohedral {0112}. The habi…
For Alnico alloys containing 32-42 percent Co, 0-9 percent Ti, 6-8 percent Al, 14 percent Ni, 3 percent Cu, 0-0.5 percent S, 0-2 percent Nb, remainder Fe, the liquidus and solidus temperatures and the upper limit of the (α + γ) phase field were determined. The greatest influence is exerted by titanium in that all temp…
Precipitation and dissolution potentials for KCl, NaCl, BaCl2, and NH4Cl have been measured with a Lindemann electrometer both in air as well as in nitrogen. The values in the latter case are lower. The electrode on which precipitation and dissolution takes place is found to be negative. The available evidence shows t…
The magnitude of the thermal hysteresis exhibited by cholesteric liquid crystals is mainly dependent upon the material composition of the system and the operating range.
Silicate glass containing arsenic as a diffusant into silicon was studied. The glass was deposited on a heated silicon substrate in the atmosphere of mixture of tetra-ethyl ortho-silicate vapor, arsenic trichloride vapor and oxygen gas between 500–700°C. The structure of the glass and its changes with heat treatments…
The heat-transfer properties of 10 underwear-outerwear ensembles were determined in the laboratory by using a heated "sweating" sectional manikin. Theoretically, by applying the i m theory to these results, a Nomex underwear-Nomex outerwear ensemble showed a slightly greater environmental range. However, little differ…
The reduction by hydrogen of Fe 3+ , Ce 4+ , and Sn 4+ in soda‐lime‐silica glass was found to be diffusion‐limited in the glass transition temperature range (500°C). The reduction was studied in fibers by chemical analysis and in bulk samples by optical absorption. Reduction to Fe 2+ , Ce 3+ , and Sn 2+ proceeds by a…
X-ray and magnetic studies have been made on the intermetallic compound Co 3+ x Ti 1- x . X-ray study indicates that Co 3+ x Ti 1- x with the Cu 3 Au-type structure has the phase field ranging from about 20.5 to 25.0 at. % Ti( x =0.180∼0) below 1,000°C. According to magnetic measurements, Co 3 Ti( x =0) is a paramagne…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiferromagnetism in transition metal complexes. III. Ground and low-lying excited states of cupric acetateR. W. Jotham and Sidney F. A. KettleCite this: Inorg. Chem. 1970, 9, 6, 1390–1395Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Pub…
An important objective in the development of a pressure suit for a human being is to permit the wearer full mobility, whether pressurized or not, without interfering with physical capability. Although the human skin is stretched during body motion, there is virtually no stretch along certain lines, here called “lines…
Summary Hodrushite, a new sulphosalt of copper and bismuth, was found in the Rosalia ore vein at Banská Hodrušá near Banská Štiavnica, Czechoslovakia. It has chemical composition Cu 8·12 Bi 11·54 Fe 0·29 S 22 (as determined by electron-microprobe method) close to Cu 8 Bi 12 S 22 . Symmetry is monoclinic, space group A…
X-ray powder data for the compounds CaO.Al2O3 and CaO.2Al2O3 have been obtained from the pure synthesized compounds. The detail of the patterns is considerably greater than that obtained by previous workers.
The dc electrical conductivity of single-crystal and polycrystalline alumina has been measured in the temperature range 600-1573 K using an apparatus designed to avoid errors due to extraneous conductance paths. Experimental data are presented which cast serious doubts on values published hitherto.
Using potentiostatic anodic polarization techniques, the influence of chloride ions on the anodic dissolution kinetics of a series of nickel-chromium binary alloys has been studied. Based on polarization data, evidence is presented to show that over the range 20-100 w/o Cr, chloride affects the cathodic partial proces…
An exploratory study of the effects of compositional variation on glass formation in low‐silica aluminate compositions revealed that CaO is essential for glass formation at ordinary quenching rates. Other oxides, such as Li 2 O, MgO, BaO, ZnO, Na 2 O, K 2 O, BeO, B 2 O 3 , and PbO, can be present in the glass in limit…