Standardization of cement. Notes and explanations on the revision of the German cement standard DIN 1164, June 1970
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Etude en microscopie electronique du glissement pyramidal {1122} 〈1123〉 dans le magnesium
Electron Microscope Study of Pyramidal Slip {112} 〈113〉 in Magnesium We have investigated {112} 〈113〉 pyramidal slip in magnesium whose CRSS exhibits an anomalous dependence on temperature and increases between 270 and 375 K. Typical dislocation configurations were investigated by TEM in various temperature ranges. A…
Aggregation of meso-substituted water-soluble porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of meso-substituted water-soluble porphyrinsRobert F. Pasternack, Peter R. Huber, P. Boyd, G. Engasser, L. Francesconi, E. Gibbs, P. Fasella, G. Cerio Venturo, and L. deC. HindsCite this: J. Am. Chem. Soc. 1972, 94, 13, 4511–4517Publication Date (Print):June 1, 1…
Serially Deposited Amorphous Aggregates of Hard Spheres
Aggregates of several thousand equal hard spheres were constructed by depositing additional spheres, one at a time, at surface sites on a small seed cluster, placing each new sphere in contact with three already present and not moving it afterward. Always choosing the site closest to the center of the original seed re…
Phase Analysis in Zirconia Systems
Linear calibration curves were developed for determining the content of free ZrO 2 in partially stabilized zirconia ceramics by X‐ray diffraction techniques. Two methods were studied. The matrix method, in which free ZrO 2 was considered to be distributed in a matrix (the cubic phase), gave approximately equal mass ab…
Study of Tautomerism by Nuclear Magnetic Resonance Spectroscopy
The present review describes the contribution of NMR to the study of prototropic tautomerism of various types, with the exception of keto-enol tautomerism, which was dealt with in an earlier review. The bibliography contains 221 references.
Observation of Second Sound in Bismuth
We have observed the transition from ballistic to second sound to diffusive propagation of heat (phonon) pulses in the semimetal bismuth in the temperature range of 1.2 to 4.0 K. The saturated second-sound velocity is found to be independent of orientation and has a a value of (0.78\ifmmode\pm\else\textpm\fi{}0.05)\if…
ac Conductivity of Glasses
We investigate the ac conductivity of glasses due to atomic and electronic hopping between sites with random space and energy separations. Several examples are considered including the structural model of glasses recently introduced by Anderson, Halperin, and Varma, and by Philips. We find that glassy materials should…
Raman scattering and theoretical studies of Jahn—Teller induced phase transitions in some rare-earth compounds
Abstract The rare-earth crystals DyVO4, DyAsO4 and TbVO4 undergo structural phase transitions at 14, 12 and 34 K respectively induced by a cooperative Jahn-Teller effect. An experimental investigation of the phase changes has been made using Raman scattering methods. For purposes of comparison, the Raman spectra of Dy…
Charge Localization at Metal-Insulator Transitions inTi4O7andV4O7
Single-crystal x-ray investigations reveal charge localization in the insulating phases of ${\mathrm{Ti}}_{4}$${\mathrm{O}}_{7}$ and ${\mathrm{V}}_{4}$${\mathrm{O}}_{7}$. Chains of ${M}^{3+}$ and ${M}^{4+}$ sites run parallel to the pseudorutile $c$ axis, whereas the metal valences are disordered in the metallic phase…
Relation between pH and viscosity of some poly(alkylvinylpyridine N‐oxides) in aqueous solution
Abstract The variation with pH of the viscosities of aqueous solutions of the following polyvinylpyridine oxide derivatives has been studied, viz. atactic poly(2‐vinylpyridine 1‐oxide), poly(2‐methyl‐6‐vinylpyridine 1‐oxide), poly(3‐methyl‐2‐vinylpyridine 1‐oxide), poly(5‐ethyl‐2‐vinylpyridine 1‐oxide), poly(4‐vinylpy…
Atomic and magnetic structure of the Heusler alloys Ni2MnSb, Ni2MnSn, and Co2MnSn
Saturation magnetization, X-ray and neutron diffraction measurements were made on ferromagnetic alloys in the compositions Ni2MnSb, Ni2MnSn, and Co2MnSn. The compounds investigated have a crystallo-chemical structure of L21 type, with a partial disorder among NiSb atoms in the case of Ni2MnSb and Ni(Co)‒Mn atoms in t…
Structure of OrthorhombicV0.95Cr0.05O2
A structure determination of the orthorhombic phase of ${\mathrm{V}}_{0.95}$${\mathrm{Cr}}_{0.05}$${\mathrm{O}}_{2}$ based on powder data indicates that the probable space group is $F222$ and the room-temperature lattice parameters are ${a}_{o}=13.015$ \AA{}, ${b}_{o}=12.597$ \AA{}, and ${c}_{o}=5.795$ \AA{}. The stru…
Optical Absorption and Thermoluminescence of X-Ray-Irradiated KBr Crystals at Room Temperature
Two thermoluminescence peaks are observed in KBr crystals that are x irradiated at room temperature. The 185\ifmmode^\circ\else\textdegree\fi{}C peak can be removed by annealing the crystal for several hours at 400\ifmmode^\circ\else\textdegree\fi{}C and is attributed to highly localized defects. The 152\ifmmode^\circ…
Scavenging Kinetics of Electrons Produced by Irradiation of Organic Glasses; Experimental Evidence for Long Range Tunneling
This paper reports new experimental results on the influence of scavengers on the yields of trapped electrons in γ-irradiated organic glasses, which show that: (1) Trapped electron yields observed minutes after irradiation decrease exponentially with scavenger concentration; (2) transfer of trapped electrons to scaven…
Long-Range Order inβ-Brass
The long-range order in $\ensuremath{\beta}$-brass has been determined over the entire range of temperatures below ${T}_{c}$ from x-ray measurements of integrated intensities of superlattice Bragg reflections. Analysis of the data included allowance for the observed appreciable differences between Debye-Waller factors…
Thermionic Emission from Nickel Oxide
We have determined the thermionic parameters---true work function, $A$ constant, and normal energy distribution---for near stoichiometric NiO. The distribution was found to be Maxwellian, with the electron temperature matching the lattice temperature closely. The results show that the Fermi level in NiO is rather inse…
Temperature Dependence of Long-Wavelength Optic Phonons of NaF Single Crystals
Infrared reflection spectra of NaF single crystal from 160 to 660 ${\mathrm{cm}}^{\ensuremath{-}1}$ as functions of temperature up to about 1000 \ifmmode^\circ\else\textdegree\fi{}K are presented. A Kramers-Kronig (KK) dispersion analysis is applied to these spectra. The optical constants, long-wavelength optic-phonon…
Thermal Conductivity of an Anharmonic Crystal
An expression is obtained for the lattice thermal conductivity of an anharmonic crystal by the method of double-time Green's functions using the energy-flux operator propounded by Hardy. The study uses cubic and quartic anharmonic terms in the crystal Hamiltonian. It is found that the nondiagonal part of the energy-fl…
Theory of Inelastic Scattering of Slow Electrons by Long-Wavelength Surface Optical Phonons
The purpose of this paper is to present a quantum-mechanical theory of the inelastic scattering of slow electrons by long-wavelength surface optical phonons for simple models of an ionic crystal and for a nonionic crystal such as silicon. It is argued that a quantum-mechanical approach is necessary for this problem. H…