Materials Literature
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Shock-wave compression measurements from 20 to 300 kbar are reported for hexagonal boron nitride. A phase transition occurs at 122 kbar and 230°C in good agreement with static data. The volume decrease is approximately 19% and the estimated slope of the phase line for the solid–solid transition is −3.6 × 10−2kbar °C−1…
Frequency assignments for the vibrational modes of species Bu in CaWO4 and CaMoO4 are made. Bu modes are both infrared inactive and Raman inactive in unstrained material, but become infrared active and exhibit Eu characteristics under xz or yz shear strain and Au characteristics under xy shear strain. In the present p…
The infrared spectra of rare earth acetates have been studied to examine the metal-acetate bonding. The thermal decomposition of rare earth acetates as well as lead and copper acetates have been investigated in detail by employing thermogravimetric analysis and differential thermal analysis. Thermal decomposition of c…
The temperature dependence of the resistance of iron has been measured in the range 1 to 4.2\ifmmode^\circ\else\textdegree\fi{}K. Single-crystal iron specimens 100 to 300 \ensuremath{\mu} in diameter with residual resistance ratios up to 2100 were used in the experiments. The dominant temperature dependence in this ra…
The exact eigenvalue spectrum and thermodynamic properties of the spin Hamiltonian $\mathcal{H}=2|J|\ensuremath{\Sigma}\stackrel{\frac{N}{2}}{i=1}({\mathrm{S}}_{2i}\ifmmode\cdot\else\textperiodcentered\fi{}{\mathrm{S}}_{2i\ensuremath{-}1}+a{\mathrm{S}}_{2i}\ifmmode\cdot\else\textperiodcentered\fi{}{\mathrm{S}}_{2i+1})…
Received 20 November 1967DOI:https://doi.org/10.1103/PhysRevLett.20.59©1968 American Physical Society
The anodic behavior of Fe-Si alloys containing 2∼22% Si in deaerated H2SO4 solution (20°C) was studied by the potentiostatic method. The effects of the Si content on the corrosion potential Ecorr., passivation potential Ep, passivation current density Ip and passive current density ik were determined. The effects of c…
The preparation and properties of silver tripolyphosphate have been investigated. It has been found that silver tripolyphosphate dihydrate decomposes on heating, first into anhydrous silver tripolyphosphate forms I and II, and subsequently into crystalline silver pyrophosphate together with a glass containing ortho-,…
Three broad types of natural graphites are recognized: flake, vein, and amorphous. The compaction of graphite powders, representing these types, into coherent binderless artifacts at room temperature and pressures up to 125, 000 psi has been studied. The graphite powders were characterized as to their particle size di…
The chemical structures of the color reaction products (Ib and Ic) obtained from butyl-and p-tolyl-urea with diacetyl monoxime and glucuronolactone in phosphoric acid were elucidated by their physical properties. Ib develops immediately a red color in phosphoric acid and is thought to be one of the main reaction produ…
Tests are described on the adhesive strength of gold films deposited on glass substrate under tensile loads. Through a flat-topped rivet fixed by an adhesive onto the film the force to pull the film was transmitted normally to the substrate surface. This force was measured by a spring balance at two increasing rates o…
Magnesium ammonium phosphate hexahydrate MgNH4PO4,6H2O and magnesium hydrogen phosphate trihydrate MgHPO4,3H2O have been heated to temperatures up to 1220° and X-ray powder photographs taken of the products. Both substances decompose during the process and gradually change first into an amorphous phase and then into c…
Résultats de spectrométrie α pour 224Ac 27 raies, 223Ac 25 raies, 220Fr 15 raies, 219Fr 6 raies.
L'afghanite, nouvel alumino˗silicate de sodium, calcium et potassium, a été découverte dans la mine de lapis-lazuli de Sar-e-Sang, Badakhshan, Afghanistan. Hexagonale avec a = 12,77, c = 21,35 Å, V = 3015 ų, les groupes de symétrie possible étant P6₃/mmc, P6₃mc ou P[-6]2c. Z = 3 (Na,Ca,K)₁₂ (Si, Al)₁₆ O₃₄ (Cl, SO₄, C…
The electroreduction of 1,8-diaroylnaphthalenes, 2,2′-diaroylbiphenyls, and αω-diaroyl-propanes, -butanes, and -pentanes with 4-hydroxy- and 4-methoxy-substituents on the aryl group has been examined. Cyclic glycols are formed, together with other products, except in the case of the αω-diaroylpentanes which give linea…
Pure titanium metal was electrodeposited on a cathode by double fused salt electrolysis with the cell designed specifically for this work. Electrolysis was carried out in NaCl, NaCl-TiCl2-TiCl3 and NaCl-K2TiFx baths. The anode materials for the first stage electrolysis were Ti-C-O alloys or TiC prepared by carbon redu…
Nine carbon and low alloy cast steels cast in panel form, some machined and others unmachined, were exposed in marine and industrial atmospheres for periods of one-, three-, seven-, and 12-years and recorded as to weight loss information. The weight loss was converted to corrosion rate in terms of inches penetration p…
The dependence of the spherical aberration coefficient C s on object position z 0 and magnification M is studied using Glaser's bell-shaped field model. It is shown that C s may be written in the forms IMG1 where a i and b i are functions of the lens excitation k 2 . a i and b i are tabulated for a range of values of…
Stress relaxation at constant strains has been studied in crystals of copper and α-brasses containing 10, 20, or 30 at.-% zinc at 77,200, and 291° K after consecutive small plastic deformations. Close to the yield point the relaxation was generally within 1% of the applied stress, but at large deformations, notably wi…
Distributional results in the lower tail, and further percentage points in both tails, are given for the statistic WN2, or NωN2, used in testing for goodness of fit.