Materials Literature
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The paraffin C33H68 undergoes three solid-solid phase transitions between room temperature and the melting point. The orthorhombic modification (A) stable at low temperatures is followed by two different monoclinic forms (B: 54.5°C < T < 65.5°C; C: 65.5°C < T < 68°C) and by the ``rotator ph…
We report a study of the infrared and Raman spectra of bulk glasses in the binary alloy system ${\mathrm{Ge}}_{1\ensuremath{-}x}{\mathrm{S}}_{x}$ ($0.90\ensuremath{\ge}x\ensuremath{\le}0.55$). The spectra are interpreted in terms of models based on covalent bonding in which the $8\ensuremath{-}N$ rule is satisfied; i.…
We describe the relation between the observed behavior of photoemission energy distributions vs frequency, angle, etc., and the quantum theory of photoemission as recently set forth formally by Caroli et al. We derive a Fermi's Golden-Rule formula for the angle- and energy-resolved photocurrent from an independent ele…
High-resolution electron diffraction patterns have been obtained from frozen, hydrated catalase crystals to demonstrate the feasibility of using a frozen specimen hydration technique. The use of frozen specimens to maintain the hydration of complex biological structures has certain advantages over previously developed…
Abstract Poly‐[2,2′‐(m‐phenylene)‐5,5′‐bisbenzimidazole] (PBI) was originally developed as a fiber‐forming polymer for military applications. The eventually established intrinsic nonflammability (LOI 48%) and high moisture regain (13%) expanded application areas significantly; e.g., into protective suits. More recentl…
Photoemission spectra have been recorded for the dichalcogenides of several metals in groups IVA and IVB, using incident photon energies of 21.2, 40.8 and 48.4 eV. Considerable structure is resolved in the valence bands which are based mainly on chalcogen p orbitals. An interpretation given in terms of a simple LCAO m…
The calculation of radiative transition probabilities between two rare earth energy levels using the Judd-Ofelt approach is extended to include J mixing. The theory is used to explain a purely radiative transition in Eu 3+ when situated in two different host materials. Next the theory is applied to the 4 S 11/2 transi…
The influence of rare-earth (RE) impurities as well as the host ions in the thermoluminescence (TL) of CaSO 4 phosphors has been studied in detail by recording the TL glow curves, TL emission spectra and electron spin resonance (ESR) spectra of a number of gamma-irradiated CaSO 4 samples doped individually with differ…
Water vapor that condenses on a metal surface at 10 degrees K forms a noncrystalline phase of estimated density 1.2 grams per cubic centimeter. X-ray diffraction data of high precision and resolution have been analyzed to yield oxygen atom pair correlation functions. The positional correlation in amorphous solid water…
Abstract Die optische Absorption von 3d‐Übergangselementen in geschmolzenem SiO, wird untersucht.
A microscopic theory of ionic transport in superionic conductors is presented. Based on a liquidlike description of the ionic carriers, it describes the frequency and temperature dependences of the conductivity. A sum rule is obtained and the theory predicts the existence of a conductivity peak which scales with the i…
The influence of the eccentricity of electrostatic lenses on the spot size is analytically formulated and is numerically evaluated for the Butler type lens and the three anodes accelerating lens. For the aperture size which gives the minimum spot size, it is found that the misalignment less than 100 µm between the ano…
Electronic and nuclear inelastic scattering in surface channeling are studied in detail for slow ions. The transition probability of inelastic scattering is obtained as a function of the position (measured from the first atomic layer) and the scattering angle. As an example, we calculate 10- and 100-keV ${\mathrm{H}}^…
The deformation process in an ideal layer crystal proceeds exclusively by dislocations gliding along the basal plane. No tangling of the dislocations is expected. Structural defects present before deformation are responsible of hardening and work hardening. This is the case for Frank dislocation loops and non-basal gr…
Fine‐grained and coarsely oolitic kaolinite clayrocks that closely resemble in composition, texture, and structure those of the Garie Formation in the southern part of the Sydney Basin are described from the Western Blue Mountains of New South Wales. The kaolinite clayrocks form part of a fine‐grained unit, here desig…
Clostridium pasteurianum strain W-5 was selected as an anaerobe which may be grown from large inocula in defined media with sulfate as its primary sulfur source. Since it is important to keep inocula small in minimizing transfer of sulfur sources, culture conditions were optimized. The medium devised decreased lag per…
Article Structure cristalline de l'ultraphosphate de calcium: CaP4O11 was published on December 1, 1974 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 140, issue 3-4).
The magnetic behaviour of [FeIIL3] (ClO4)2, L=2-CH3-phen (phen = 1,10-phenanthroline) (I), 2-CH3O-phen(II), 2-Cl-phen(III), and 2,9-bis(CH3)-phen(IV), has been examined in the temperature range 300-4.2 K using the Mössbauer effect technique. The α-substituent in the ligand influences strongly the magnetic behaviour. C…
Abstract Linear, crystalline polymers corresponding to the general formulas magnified image where X is CH 2 , O, or S, were synthesized, and their isomorphous relationships were studied. The results point out that a close structural relationship exists within each series of compounds investigated.
Both deformation twinning and martensitic transformation may be regarded as modes of deformation, and models which relate the nucleation and growth of twins and martensite plates to dislocations and stacking faults are reviewed. Recent experimental and theoretical work indicates that b. c. c. twins mays originate from…