Materials Literature
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The progressive intercalation of graphite by potassium has been studied by x-ray diffraction methods. It has been established that potassium graphites of stages 4, 3, 2 and 1 (with intercalated potassium layers separated by 4, 3, 2 and 1 graphite layers respectively) can be formed successively within a single graphite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry, electron paramagnetic resonance, and visible spectra of cobalt, nickel, copper, and metal-free phthalocyanines in dimethyl sulfoxideLouis D. Rollmann and Reynold T. IwamotoCite this: J. Am. Chem. Soc. 1968, 90, 6, 1455–1463Publication Date (Print):March 1,…
In the X-ray diagrams of some segmented urethane elastomers, so-called hard-segment interferences can be observed which indicate a defined geometrical accumulation of the hard segments. These interferences can easily be traced back to a system of hydrogen bridges between the hard segments. They allow an insight into t…
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Variations of sample temperature arising from the electrocaloric effect, antiferroelectric to ferroelectric transitions, and hysteresis-loss heating have been recorded together with the hysteresis loops for four different ceramic ferroelectrics near room temperature. Both the electric-field dependence and the temperat…
Abstract The penetration of new markets by polyester fibers has emphasized the need for increased stability of the polyester toward a variety of degradative reactions. Extensive studies of the nature of the thermal, hydrolytic, oxidative, and radiation‐induced degradation reactions have been reported. The interpretati…
Abstract A comparison of the kinetic and diffusional models for solid‐gas reactions occurring in a spherical particle is presented. The similarities and differences of the unreacted‐core shrinking model and the homogeneous model are examined in light of the rate‐controlling factors. In view of the similarity of the tw…
The Raman spectrum of single-crystal SrTiO3 has been investigated as a function of temperature down to about 25°K. The lattice dynamics of this crystal have been extensively studied in recent years primarily because of its unusual dielectric and acoustic properties. Both nominally pure and impure samples were examined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterizationGeorge A. Tsigdinos and Calvin J. HalladaCite this: Inorg. Chem. 1968, 7, 3, 437–441Publication Date (Print):March 1, 1968Publication History Published online1 May 2…
X-ray scattering factors for neutral atoms from He to Lw and for most of the chemically significant ions through Lu3+ have been computed from numerical Hartree–Fock wave functions. The results are given in the form of coefficients for an analytic function.
CONTENTS I. Features of the chemical structure of steroids 155 II. Correlation of the infrared spectra of steroids with their structure 156 III. Use of infrared spectroscopy in steroid chemistry 164
CONTENTS I. Introduction 142 II. Classification of masking processes 143 III. Methods for calculating the efficiency of masking 144 IV. Masking and the selectivity of reactions 148 V. The most common masking agents 149 VI. Characteristic examples of the practical application of masking 153
Probable functions of the baculum are reviewed. Consideration of vectors of resistance of the vaginal orifice and of forces of the baculum reveals possible reasons for the specialization of the bacular tip in some carnivores and rodents. Coefficients of variation of length and some other measurements of some bacula of…
The 7Li NMR spectra from several lithium borate glasses have been examined as a function of temperature and found to narrow abruptly with increasing temperature in the range of temperatures from 250° to 475°K. The observed narrowing is a manifestation of the phenomenon of motional narrowing, and is attributed to diffu…