Materials Literature
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The room-temperature polarized reflectance of a potassium-deficient platinum chain salt ${\mathrm{K}}_{1.75}$Pt${(\mathrm{CN})}_{4}$\ifmmode\cdot\else\textperiodcentered\fi{}1.5${\mathrm{H}}_{2}$O [K(def)CP] has been measured in the infrared and visible. The reflectance is strongly anisotropic, with a plasma edge in t…
Crystalline powder pellets of MoO3 and WO3 were irradiated with 253.7 nm radiation at room temperature in vacuum, in the presence of H2 and in the presence of Hg vapor and H2. Electronic changes induced in the surface of the solids were studied by x-ray photoelectron spectroscopy. In vacuo both MoO3 and WO3 turned blu…
The structures of the paraelectric (tetragonal) phase of KH 2 PO 4 (KDP) and 95% deuterated KD 2 PO 4 (DKDP) have been investigated as a function of pressure and temperature using high-resolution (sin theta max / lambda >1 AA -1 ) single-crystal neutron-diffraction techniques. Data have been collected for both KDP and…
The structures of the paraelectric (tetragonal) phase of KH 2 PO 4 (KDP) and 95% deuterated KD 2 PO 4 (DKDP) have been investigated using high-resolution (sin theta b max / lambda >1.1 AA -1 ) single-crystal neutron-diffraction techniques. Full three-dimensional data have been collected at T c +5K and T c + approximat…
Some brown gem-quality diamonds exhibit bright yellow luminescence when excited with a long-wave ultraviolet (365 nm) mercury lamp. The authors describe detailed absorption and luminescence measurements in the visible spectral region, and absorption measurements in the defect-induced one-phonon region, using a large n…
Because the distances between atoms vary with direction within a crystal, the properties of a crystal also vary with direction. Such property variations are called crystalline anisotropy, and the amount of anisotropy depends on the symmetry of the crystal structure. The alpha-phases of uranium depends on the symmetry…
Abstract In measurements of grain boundary transport it is the product of the grain boundary enrichment ratio and the grain boundary diffusivity that is usually obtained. This work presents the first study in which these two terms are separated and in which the role of the grain boundary composition in grain boundary…
The commensurate charge-density-wave state of $2H$-${\mathrm{TaSe}}_{2}$ can have hexagonal ($H$) or orthorhombic ($O$) symmetry. With use of a Landau theory it is shown that near the boundary between $H$ and $O$ states a discommensuration splits into two $H\ensuremath{-}O$ interfaces and thereby greatly lowers its en…
一般式 (Bi2O2)2+(Mem-1RmO3m+1)2-で表されるBi層状化合物の中, 一致溶融し, しかも比較的高いキュリー点を有する7種の化合物の組成, 及びこれに少量のPbO, Bi2O3, B2O3などを添加した組成の融液を, 白金るつぼ中で70°-140℃/cmの温度こう配下で0.7-2.9mm/hの速度で下から上に向け一方向に凝固した. その結果, いずれの組成, いずれの凝固条件の場合も, 分極軸のa軸あるいはb軸を凝固進行方向にほぼ完全にそろえたBi層状化合物の配向性多結晶体が得られた. これらの多結晶体の多くは, 空げき及びき裂をいくらか含んでいたが, (Bi2O2)(PbNb2O7) にPbO-Bi2O3-B…
Fluoropolymers possess a number of unusual properties which should prompt wide usage in marine applications: (1) exceptional resistance to the effects of water, sunlight and biological organisms, (2) non-wetting, fast-draining surfaces, (3) anti-adhesive surfaces, (4) low friction or dry-film lubricant properties, and…
Abstract Experimental observations of the cyclic deformation and temperature rise in Mallory tubes during testing are described. The analyses of the data explain the temperature rise in terms of heat generated by the cord and rubber during the cyclic deformation. Using the measured temperature rise and the heat genera…
On the basis of structural data of the disordered tetragonal phase of tanane, the Van der Waals intermolecular forces are computed for the 16 nearest neighbours of a given molecule. Considering first the molecular ordering in a « rigid » tetragonal lattice, the pair energies between neighbouring molecules are analysed…
An investigation of two gear steels, AISI 9310 and VASCO X-2, carburized to a depth of 1.524 mm, was conducted to evaluate the effect of materials processing parameters on the fatigue lives of these materials in rolling contact fatigue, in single-tooth bending fatigue, and, finally, in a four-square dynamometer gear t…
Chemical and cation exchange characteristics, x-ray and DTA study of coarse and fine soil clays from duny areas of western Rajasthan showed that fine clays contained smectite, mica, mica-smectite and kaolinite. In addition to these, dune soil clay had minor amount of interlayered smectite and chloritic minerals, where…
Preliminary laboratory experiments were carried out to obtain some informatio on the nature of potential carbon fiber emissions resulting from the machining and incineration of graphite/epoxy composites. Examination of residues by scanning electron microscopy following exposure of graphite fiber products in a laborato…
An approximate method enabling rapid calculation of critical size as a function of the ambient temperature for bodies of arbitrary shape under generalized boundary conditions is given. These boundary conditions apply when there is resistance to heat transfer both within and at the surface of the reactant. The approach…
Inclusions reduce Blochwall areas and increase free magnetic poles. Magnetostriction leads to stresses. Blochwall configurations and movement during magnetization changes are strongly affected by the mechanical properties. Especially important is the interaction of dislocation with Blochwalls. Magnetic Barkhausen meas…
Abstract The melting of alkali halides occurs probably at a critical mole fraction x c = 3.2 · 10 −4 of thermally created vacancies (Schottky defects). Using this value the formation entropy of Schottky defects is found to be s S = (962.1 K mol/kJ L/ T m – 16.1) k ( L, T m heat and temperature of fusion, respectively)…
With the aid of a derivative spectrophotometer, emission characteristics of formaldehyde from a methanol fueled S. I. engine were obtained. Formaldehyde and unburned methanol were measured at several distances along the exhaust tube for various air-fuel equivalence ratios and ignition timings. Experiments show that do…
The thermal-shock behavior of ZrO2-CaO and ZrO2-MgO pellets was investigated by immersing these pellets into liquid iron without preheating temperature or with preheating temperature. The moduli of rupture before and after the thermal-shock were measured by a three point bending technique. A good thermal-shock resista…