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。
Studies of the physical and chemical forms of I131 fallout following the USSR nuclear tests of late 1961 and the United States and USSR studies of 1962 have shown that the fraction existing in the gaseous state varied from about 10 to 90 per cent. Very little of the gaseous I131 appeared to be in the elemental or HI f…
The relative magnetization of an assembly of fine, ferromagnetic, single-domain particles which show uniaxial magnetic anisotropy has been formulated as a function of ρ and λ, the ratios of magnetic energy of particle moment in field and anisotropy energy to thermal energy, respectively, under various situations for p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHERMOCHEMISTRY OF ANION MIXTURES IN SIMPLE FUSED SALT SYSTEMS. II. SOLUTIONS OF SOME SALTS OF MO4- AND MO4-2 ANIONS IN THE CORRESPONDING ALKALI NITRATESO. J. Kleppa and S. V. MeschelCite this: J. Phys. Chem. 1963, 67, 12, 2750–2753Publication Date (Print):December 1, 1963Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDialkoxyphthalocyaninosilicon Derivatives1aPaul C. Krueger and Malcolm E. KenneyCite this: J. Org. Chem. 1963, 28, 12, 3379–3381Publication Date (Print):December 1, 1963Publication History Published online1 May 2002Published inissue 1 December 1963https://pubs.acs.org/doi/10…
The equation derived by Peierls for the occupation numbers ${N}_{q}$ of phonon states with wave vector q and appropriate polarization is linearized to give a maser equation for the deviations ${n}_{q}\ensuremath{\equiv}{N}_{q}\ensuremath{-}{{N}_{q}}^{0}$ from equilibrium. This master equation, with transition probabil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE THERMODYNAMIC PROPERTIES OF MAGNESIUM ORTHOPHOSPHATE AND MAGNESIUM PYROPHOSPHATEF. L. Oetting and R. A. McDonaldCite this: J. Phys. Chem. 1963, 67, 12, 2737–2743Publication Date (Print):December 1, 1963Publication History Published online1 May 2002Published inissue 1 Dec…
The electric strength of n -hexane for steady fields (direct strength) is found to increase from 0.7 MV cm -1 to 1.3 MV cm -1 and to become insensitive to electrode material as the amount of dissolved oxygen is increased to an equilibrium partial pressure of 100 mmHg in the vapour phase above the liquid. Greater amoun…
Vapor densities of magnesium-bearing species over magnesium oxide were determined by the transpiration method. The MgO reacted with water vapor present in the carrier gas to form gaseous Mg(OH)2. The standard free energy of formation in calories per mole is given over the temperature range from 1660° to 2010°K by the…
Thermal conductivity measurements are used to study phonon scattering by $F$ centers in NaF, KCl, KBr, and KI. $F$ centers were produced by additive coloration and by x and $\ensuremath{\gamma}$ irradiation. The total effect on the thermal conductivity is seen to be different for the two methods of preparation. The ad…
Numerical calculations, based on spin wave theory, have been carried out in connection with the magnetic properties of two simple ferromagnetic salts, EuO and EuS, and the antiferromagnetic compound MnF 2 . The resulting predictions regarding magnetization and specific heat have been compared with experiment over as w…
A neutron diffraction study of polycrystalline HCrO 2 and DCrO2 (chromous acid) is described. Intensity data from the two substances were refined together by the lea~t-squares method, with the constraint that the Cr-O distance be the same in the two substances. Estimates of individual contributions to multiple peaks w…
An empirical description of the shape of optical absorption bands due to localized excitons in ionic crystals is proposed. The new formula links a nearly Gaussian description of the band near its maximum with an exponential description of the band on the low-energy tail (Urbach's rule). The applicability of the propos…
Abstract Poly‐β‐hydroxybutyric acid has been isolated from two bacterial sources by two different procedures. Molecular weight and intrinsic viscosity for the two samples were vastly different. This was blamed on degradation occurring during polymer isolation. An optical rotatory dispersion curve for the high molecula…
Numerous advances in the formulation and processing of electrical insulating compounds based on chemically cross-linked polyethylenes have taken place since they were first introduced commercially in 1958. The result has been a new family of polyethylene based insulations covering a wide range of properties. A review…
A Kerr magneto-optic apparatus has been used to observe the effects of tensile stress on the domain structure in grain-oriented 3.25% silicon steel. Unlike the powder pattern technique, the Kerr apparatus reveals the complete surface domain structure without regard to the type of domain wall, and enables observation o…
Summary Nickel carbonate occurs in nature as a hexahydrate (hellyerite) and as a hydroxyhydrate (zaratite), but the anhydrous species is only known as an artificial product. All of the compounds show anomalous properties that have led to confusion in the literature. Only the calcite structure was found for NiCO 3 ; hy…
The influence of milling upon some magnetic properties of the intermetallic compound MnAlGe has been studied. The Curie temperature of the material seems to be independent of particle size and is constant at 245°C. The saturation magnetization σs, which is 55 erg/Oe·g in the annealed state, decreases as the grinding t…
The quenching technique has been used to determine equilibrium relations in the system manganese oxide‐Cr 2 O 3 in air in the temperature range 600° to 1980°C. The following isobaric invariant situations have been determined: At 910°± 5°C tetragonal Mn 3 O 4 solid solution, cubic Mn 3 O 4 solid solution (=spinel), Mn…
An improved counterbalanced sphere viscometer—densitometer was used to obtain density information between 1050° to 1500°C for a series of binary germanate melts containing as much as 60 mole% Li2O, Na2O, K2O, and Rb2O. Densities and the expansion coefficient of molten GeO2 between 1100° to 1400°C were estimated from t…
A study has been made of high-resolution absorption spectra of C 12 S 2 and C 13 S 2 in the region 4300–3300 Å. The spectra are shown to arise from transitions from the ground state to two or more excited electronic states. In the lowest excited state the molecule is not linear, and the following constants have been d…