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。
Some electronic defects and the associated photoelectronic processes in Th${\mathrm{O}}_{2}$ are analyzed by utilizing the data from thermoluminescence (TL) and EPR measurements on a number of rare-earth-doped and undoped single crystals from various sources. (The EPR measurements were made by others.) Some fluorescen…
For the first time, phosphorescence has been observed from and clearly assigned to the molecular triplet of several metallophthalocyanine (Pc) molecules. The Pc's of Pt, Pd, Cu, Zn, and Cd have O–O bands in solution (77°K) at the extraordinarily low energies of 10 590, 10 100, 9390, 9150, and 9120 cm−1, respectively,…
Using a simple Hamiltonian of the tight-binding type, rigorous bounds are derived for the density of states of a tetrahedrally bonded solid. These include inner bounds which define a band gap between occupied and unoccupied states. The derivation uses only the assumed perfect coordination of nearest neighbors, and so…
The energy distribution and angular dependence of secondary electrons generated by the impact of 100–2000-eV electrons on He, N2, and O2 and by the impact of 500-eV electrons on Ne, Ar, Kr, Xe, H2, NO, CO, H2O, NH3, CH4, C2H2, and CO2 have been measured over the 4–200-eV range. The measurements were made in a crossed-…
Dispersion relations of phonons propagating along three symmetry directions in calcium oxide have been measured by the triple axis neutron spectrometer method. The experimental results have been interpreted in terms of a shell model showing that the electronic polarizability of both ions must be taken into considerati…
Measurements are reported of photoluminescence from three defect centres in diamond which have characteristic absorption and emission lines at 1.673 eV, 1.944 eV and 2.498 eV respectively. When excited with plane polarized light the emission from the 1.673 eV centre was found to be unpolarized in agreement with a cent…
In the system (${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x})}_{2}{\mathrm{O}}_{3}$, the antiferromagnetic insulating phase is suppressed for $x>0.05$. The linear term in the heat capacity is very large ($\ensuremath{\gamma}=192\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ cal \ifmmode^\circ\else\…
Abstract The magnetic field at the site of the nuclei 152 Sm and 154 Sm in a ferrimagnetic Sm 6 Mn 23 probe has been measured by means of the perturbed angular correlation method after Coulomb excitation. The temperature dependence of the magnetic field has been investigated and compared with the results of macroscopi…
Un atome irradié par des photons non résonnants peut les absorber et réémettre virtuellement ; il est en quelque sorte "habillé" par les photons du champ électromagnétique dans lequel il est plongé. Nous montrons dans cet article comment les propriétés physiques d'un atome "habillé" par des photons optiques ou de radi…
The Boltzmann transport equation is solved taking into consideration the skew scattering of carriers in a magnetic semiconductor. The conductivity tensor is derived and used in the study of the spontaneous Hall effect. The effect of anisotropic scattering and spin-orbit interaction usually present in magnetic metals i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of the glass transition temperature on heating rate and thermal historyCornelius T. Moynihan and Pedro B. MacedoCite this: J. Phys. Chem. 1971, 75, 21, 3379–3381Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue…
Abstract Da katalytische Untersuchungen mit atomar verteilten Metallen neue experimentelle Methoden erforderlich machten, wird zunächst be‐richtet über die Methoden zur genauen Dosierung von Nickel‐ und Palladiumbelegungen Θ Me ≥ 10 −2 auf im Ultrahochvakuum hergestellten Kohlenstoffilmen sowie über das spezielle Mass…
Magnetic measurements were made of the systems (Cr 1.01 Sb) 1- x (Fe 1.22 Sb) x and (Cr 1.01 Sb) 1- x (Co 1.13 Sb) x . In both systems, ferromagnetism appeared in the intermediate range of x . In the (Cr, Fe)Sb system maximum of the spontaneous magnetization and the Curie temperature was found at x =0.6. However, the…
Abstract An approximate method is described for calculating electrostatic fields of rotational symmetry with arbitrary boundary conditions. The method is based on the computation of the surface charge density on the field forming electrodes. Successfully tested by well-known analytical solutions, the method is applied…
Piezoelectric lithium formate monohydrate crystallizes in the orthorhombic system with a tetramolecular unit cell of dimensions a = 6.504 (10), b = 9.989 (10), c = 4.856 (5) Å in the space group Pbn21. The crystal structure has been solved by vector superposition methods and refined to an R value of 10.3 % for 331 obs…
The optical properties of Dow Corning-704 and -705 diffusion-pump oils have been measured from 4→24.8 eV using an open-dish technique. These are the first liquids for which optical constants have been obtained above 11.8 eV. In the region above 10.6 eV, the real part of the dielectric constant is structureless. A coll…
Abstract Almandite, a natural garnet, orders antiferromagnetically at T N = 7.5°K. The spin structure has the magnetic symmetry Ia 3 d ′. The oxygen parameters are x = − 0.03398, y = 0.04935, z = 0.15284 at 300°K; they have practically the same values at 4.2°K.
Abstract The photolysis of 1‐( o ‐azidophenyl)‐1 H ‐indazole (IV) has been found to give a mix ture of 6‐dehydroindazolo[1,2‐ a ]benzolriazole (VI) and 2,2′‐di(1‐indazolyl)azobenzene (VII). On the other hand, 1‐( o ‐nilrophenyl)‐1 H ‐indazole (1) was reduced with triethyl phosphite, affording VI and dibenzo[ a,i ] ind…
A laboratory gas circulation pump has been built in which the pump driving force is obtained by the alternate decomposition and regeneration of vanadium dihydride (VH2). This cyclic action is accomplished by alternately heating and cooling the hydride system using hot (50°C) and cold (18°C) water. The particular pump…
Abstract Impact behavior can be predicted for rate‐dependent foams from constant rate of strain response. The response must be factorized into a rate‐dependent modulus function and a strain‐dependent function. In this way the rate‐dependent modulus can vary throughout the impact as the velocity of the impacting object…