The dielectric, calorimetric and dilatometric measurements have been made on the solid solutions Pb(Zr-Ti)O 3 which contain small amounts of PbTiO 3 less than 10%. Besides the ordinary Curie point near 220°C, the existence of another transition, for example 140°C in Pb(Zr95-Ti5)O 3 , was confirmed. It seems reasonable…

Optical and Acousto-Optic TechnologiesFerroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear Optics

Collisional Perturbation of Spin-Orbital Coupling and the Mechanism of Fluorescence Quenching. A Visual Demonstration of the Perturbation

Michael Kasha1952-01-01OpenAlex

A yellow color is produced when two colorless pure liquids, α-chloronaphthalene and ethyl iodide, are mixed, although no chemical reaction occurs. Spectroscopic examination reveals that the lowest singlet→triplet absorption band of the naphthalene molecule is greatly enhanced in intensity in the presence of the iodide…

Magnetism in coordination complexesLanthanide and Transition Metal ComplexesPhotochemistry and Electron Transfer Studies

Electrical Conductivity of Silver Sulfide

Malcolm H. Hebb1952-01-01OpenAlex

Mixed electronic and ionic conduction in silver sulfide is examined. The importance of terminal conditions which may affect the ratio of ionic to electronic currents in experimental measurements is emphasized. In particular, either the electronic or ionic components can be completely suppressed. This is the basis of a…

Solid-state spectroscopy and crystallographyAdvanced Physical and Chemical Molecular InteractionsChemical Thermodynamics and Molecular Structure

X. Quantitative measurement of preferred orientation in rolled uranium bars

Glenn Harris1952-01-01OpenAlex

Synopsis The preferred orientation of uranium bars hot-rolled and cold-rolled in the α range has been determined quantitatively by x-ray diffraction using a Geiger counter. It is shown that hot rolling with a slight reduction causes the 010 planes to become strongly and the 110 planes weakly oriented perpendicular to…

Nuclear Materials and PropertiesNuclear reactor physics and engineeringRadioactive element chemistry and processing

Nuclear Reactor Theory

George I. Bell、Samuel Glasstone1952-01-01OpenAlex

The purpose of this book is to explain the most important physical concepts and mathematical methods commonly used in predicting the behavior of neutrons in nuclear reactors An effort has been made to avoid mathematical complexity that does not lead to a significant increase in physical understanding or is not used in…

Nuclear and radioactivity studiesGraphite, nuclear technology, radiation studiesNuclear reactor physics and engineering

Theoretical Spectra of Luminescent Solids

Ferd E. Williams、Malcolm H. Hebb1951-12-15Physical Review

From the potential energy curves for the ground and excited states of the thallium activator in potassium chloride, the absorption spectrum of this phosphor is calculated by direct evaluation of the matrix elements for electronic transitions between the individual vibrational levels of the initial and final states. Ha…

Luminescence Properties of Advanced MaterialsSolid-state spectroscopy and crystallographyOptical and Acousto-Optic Technologies

The mechanical behaviour of single crystals of certain face-centred cubic metals

Edward Neville Da Costa Andrade、Carl Henderson1951-12-05Philosophical Transactions of the Royal Society of London Series A Mathematical and Physical Sciences

Abstract Single crystal rods of gold, silver and nickel have been prepared from the melt by a modified cooling method. The three metals differ in that the gold is very pure and has no surface contamination; the silver is very pure and the surface normally shows contamination; the nickel is markedly less pure. These th…

Surface and Thin Film PhenomenaMicrostructure and mechanical propertiesMicrostructure and Mechanical Properties of Steels

One- and Two-Dimensional X-Ray Diffraction

B. D. Cullity1951-12-01American Journal of Physics

A description is given of the diffraction phenomena from crystals so small in some directions that they may be considered essentially as one- or two-dimensional crystals. The basic theory of x-ray diffraction, in terms of the Ewald construction in the reciprocal lattice, is first presented for the case of a three-dime…

X-ray Diffraction in Crystallography

Wax Blooming and Exposure Cracking

Lauren Best、R. C. W. Moakes1951-12-01Rubber Chemistry and Technology

Abstract A brief résumé is given of the types of deterioration which cause cracking and similar forms of deterioration in vulcanized rubber and the possible remedies. A study has been made of the development of wax bloom on rubber and some of the factors which affect this development. The waxes constituting the bloo…

Polymer Nanocomposites and Properties

Thermodynamic Properties of Fluorapatite, 15 to 1600°K.1

Edward P. Egan、Zachary T. Wakefield、Kelly L. Elmore1951-12-01Journal of the American Chemical Society

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic Properties of Fluorapatite, 15 to 1600°K.1Edward P. Egan Jr., Zachary T. Wakefield, and Kelly L. ElmoreCite this: J. Am. Chem. Soc. 1951, 73, 12, 5581–5582Publication Date (Print):December 1, 1951Publication History Published online1 May 2002Published inissue 1…

Extraction and Separation ProcessesThermal and Kinetic AnalysisRadioactive element chemistry and processing

Isolation of unequivocal uroporphyrin III. A further study of turacin

Rachel Nicholas、C. Rimington1951-12-01Biochemical Journal

Research Article| December 01 1951 Isolation of unequivocal uroporphyrin III. A further study of turacin R. E. H. Nicholas; R. E. H. Nicholas 1Department of Chemical Pathology, University College Hospital Medical School, London, W.C. 1 Search for other works by this author on: This Site PubMed Google Scholar C. Riming…

Porphyrin Metabolism and DisordersPorphyrin and Phthalocyanine ChemistryTraditional and Medicinal Uses of Annonaceae