Materials Literature
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An experimental study was made of the parameters and mechanism of the quenching of the luminescence of rare-earth ions by hydroxyl groups. This was done for nine transitions. The permissible concentration of the OH groups were found for laser glasses intended for different applications.
KDy(MoO 4 ) 2 is known to undergo a structural phase transition at 14.3K. Spectroscopic and magnetic studies of the behaviour of this compound at low temperatures have revealed some striking properties which suggest that the phase transition is of the Jahn-Teller type and that ordering occurs in an antiferrodistortive…
A theory is formulated that explains the observed bond-length change in graphite intercalation compounds in terms of the charge transfer $f$. The values of $f$ obtained via the bond-length changes are in good agreement with those derived with other methods. The present analysis also provides information on the electro…
The 0.82 eV intracentre transition of Cr 2+ ( 5 T 2 to 5 E) in GaAs is observed as a very sharp peak in the low-temperature photoconductivity response. The dependence of the photoconductivity on temperature and electric field is discussed and a comparison is made with the corresponding line in absorption. The results…
The magnetic structure of Ni 0.92 Zn 0.08 Br 2 has been studied by single-crystal neutron diffraction as a function of temperature down to 4.2K and in magnetic fields along (110) up to 3 T. From T N =48.0+or-0.5K to T IC =21.0+or-0.5K the magnetic structure is a collinear easy-plane metamagnetic one like NiCl 2 . Belo…
Cladded-type fluoride glass fibres with a transmission loss of 0.1 dB/m at 2.5 μm and 0.3 dB/m at 3.6 μm, respectively, were fabricated by a novel casting method. Relative refractive-index differences between core and cladding ranging from 0.17% to 0.33% were obtained using BaF2-GdF3-ZrF4-AlF3 glasses as core and clad…
The solution of the Ornstein-Zernike equation for a direct correlation function c(x) with damped oscillations and a hard core condition imposed upon the total correlation function h(x) has been proposed by Cummings as a means of treating a simple model potential for liquid metals in the mean spherical approximation [1…
Theory is presented which describes the competitive interaction of a multivalent solute with a univalent ligand and an affinity matrix. The formulation accounts for cross-linking interactions of the multivalent solute, and of its complexes with ligand, with matrix interaction sites in terms of two site-binding constan…
A general procedure which selectively introduced a nucleophilic group at a particular location in the active site of lysozyme has been developed. The coupling of hen egg white lysozyme with amine nucleophiles by 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC) was studied at pH 5 and room temperatur…
The specific activity of rabbit muscle glyceraldehyde-3-phosphate dehydrogenase (GAPD) has been measured as a function of GAPD concentration in the absence and presence of 18 g/dL ribonuclease A. The specific activity of GAPD at fixed concentration has been measured as a function of the concentration of added ribonucl…
Faulted structures in the FeCr σ-phase are observed in lattice images by the use of a high resolution transmission electron microscope and local atomic arrangements near the faults are deduced from the images. The faults can be divided into two classes from a structural point of view. A fault lying in the (110) plane…
The electrical properties as a function of the composition of polycrystalline Mn-Zn ferrites are investigated by measurements of the conductivity at different frequency and temperature ranges. To avoid the influence of grain surface layers the conductivity in the „high frequency saturation”︁ region of the γ(f) depende…
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The electrical conductivity and the Hall effect are investigated in the temperature region from 77 to 1000 K on undoped ZnO single crystals grown by vapour phase transport. The growth conditions were systematically altered to get crystals with definite non-stoichiometry. The electrical properties are related to these…
The numerical influence of different terms in the law of approach to saturation is tested applying a least square procedure on a variety of sets of synthetical data (256 I(H) points) which are generated using the formula I = I8[1 − (A/H) − (B/H2) − (C/H3)] + χH + D√H. Graphical methods are compared with the fitting pr…
correspondence with the authors. In a few cases the problems are not resolved and such entries are either flagged or omitted.
In order to understand the importance and limitations of the role of low-temperature thermal-conductivity data in understanding amorphous glasses, we have used the two-level tunneling-state model to generate fits to such data. A variety of densities of states have been utilized, including the forms previously suggeste…
The $c$-axis charge distribution in higher-stage potassium graphite has been obtained from an analysis of carbon $1s$ core-electron binding-energy spectra. The highly localized distribution of transferred charge in the bounding layer effectively screens the positive intercalant ions. The interior layers are thus graph…
An intrinsic room-temperature coercivity of 7.45 kOe has been found in melt-spun Nd0.4Fe0.6; this value is the largest ever reported for a rare-earth–iron alloy. A significant correlation was found between quench rate and coercivitiy, suggesting that the quenched alloys consist of fine crystallites or clusters, whose…
The crystal structure of (Et 3 NH) 2 SnCl 6 at room temperature consists of a monoclinically distorted antifluorite packing of Et 3 NH + and SnCl 6 2− ions. Each anion has two cations centrosymmetrically associated with it through bifurcated hydrogen bonds to four of the Cl atoms, leaving two of the six chlorines unen…