This paper presents methods for incorporating crystallographic symmetry properties into complex Fourier transforms in a form particularly well suited for use with the Cooley-Tukey fast Fourier transform algorithm. The crystallographic transforms are expressed in terms of a small number of one-dimensional special cases…

Enzyme Structure and FunctionCrystallization and Solubility StudiesOptical Polarization and Ellipsometry

Solid State Electronic Devices

J R A Beale1973-03-01OpenAlex

D V Morgan and M J Howes London: Wykeham Publications 1972 pp xii + 190 price £2·25 This book aims to give a qualitative understanding of the basic principles of operation of the most important solid state devices. It is written for first year undergraduate students and has the great merit of being readable and of hav…

Advanced Materials and Semiconductor TechnologiesChemical and Physical Properties of MaterialsEngineering and Technology Innovations

Interband Magnetoreflection of ZnO

Kerstin Hummer1973-03-01OpenAlex

Abstract In magnetic fields up to 50 kOe and for photon energies greater than the band gaps for light polarized with E ⊥ c and E ‖ c oscillatory changes of reflectivity are observed on ZnO‐crystals at helium temperatures. The anisotropic reduced masses and hole masses and the energy gaps are deduced from the shift of…

ZnO doping and propertiesSemiconductor Quantum Structures and DevicesQuantum and electron transport phenomena

Spectroscopic Properties of Organic Azo Compounds

Hermann Rau1973-03-01OpenAlex

Abstract Azo compounds are characterized by a low‐energy 1 (n,π * ) electronic state, which gives rise to a weak band at long wavelengths in the absorption spectrum. Coupling of this state with other low‐lying molecular states is responsible for the high intensity of the “azo band” compared to other forbidden transiti…

Photochemistry and Electron Transfer StudiesPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials

Metal-Insulator Transitions in Pure and DopedV2O3

D. B. McWhan、A. Menth、J. P. Remeika 等 5 位作者1973-03-01OpenAlex

The addition of ${\mathrm{Ti}}^{3+}$ and ${\mathrm{Mg}}^{2+}$ to ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ leads to the suppression of the antiferromagnetic insulating phase; whereas the addition of ${\mathrm{Ti}}^{4+}$, ${\mathrm{Zr}}^{4+}$, and ${\mathrm{Fe}}^{3+}$ results in a first-order transition from a metallic to a…

Magneto-Optical Properties and ApplicationsAdvanced Condensed Matter PhysicsTransition Metal Oxide Nanomaterials

Optical Constants of Water in the 200-nm to 200-μm Wavelength Region

George M. Hale、Marvin R. Querry1973-03-01OpenAlex

Extinction coefficients k(lambda) for water at 25 degrees C were determined through a broad spectral region by manually smoothing a point by point graph of k(lambda) vs wavelength lambda that was plotted for data obtained from a review of the scientific literature on the optical constants of water. Absorption bands re…

Water Quality Monitoring and AnalysisElectron and X-Ray Spectroscopy TechniquesCalibration and Measurement Techniques

Antiferroelectricity among compounds with spinel structure?

N. W. Grimes1973-02-28Journal of Physics C Solid State Physics

Recent re-evaluation of diffraction data from cubic spinel compounds has suggested that in many cases the crystal structure is properly referred to the noncentrosymmetrical space group F43m. This symmetry provides the possibility of antiferroelectric behaviour which may resolve previous theoretical difficulties concer…

Magnetic Properties and Synthesis of FerritesMultiferroics and related materialsMagneto-Optical Properties and Applications

Exhaust Catalysts: Appropriate Conditions for Comparing Platinum and Base Metal

James C. Schlatter、Richard L. Klimisch、Kathleen C. Taylor1973-02-23Science

There are fundamental differences in the behavior of alumina-supported samples of a platinum and a copper-chromium catalyst for oxidation of carbon monoxide in a simulated automotive exhaust stream. Ignoring such differences can result in inappropriate comparisons between oxidation catalysts for automotive application.

Catalytic Processes in Materials Science

Magnetic exchange energy contribution to the elastic constants and its relation to the anomalous elastic behaviour of invar alloys

G. Hausch1973-02-16physica status solidi (a)

It is shown that the anomalous elastic behaviour of Invar alloys is due to the contribution f the exchange energy. Using a molecular field approximation the exchange contributions is given in terms of the first and second derivatives of the effectives fo the effective exchange integral J(r). These parameters are corre…

Microstructure and Mechanical Properties of SteelsMagnetic Properties and ApplicationsHeusler alloys: electronic and magnetic properties