Materials Literature
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$^{151}\mathrm{Eu}$ M\"ossbauer effect measurements were carried out for various silicate and phosphate laser glasses doped with ${\mathrm{Eu}}^{3+}$ ions instead of ${\mathrm{Nd}}^{3+}$, for which Judd-Ofelt ${\mathrm{\ensuremath{\Omega}}}_{\mathit{t}}$ parameters are known. The isomer shift (IS) for the silicate gla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuaternary rubidium copper tin sulfides (Rb2Cu2SnS4, A2Cu2Sn2S6 (A = Na, K, Rb, Cs), A2Cu2Sn2Se6 (A = K, Rb), potassium gold tin sulfides, K2Au2SnS4, and K2Au2Sn2S6. Syntheses, structures, and properties of new solid-state chalcogenides based on tetrahedral [SnS4]4- unitsJu…
Various metals were deposited on luminescent porous silicon (PS) by immersion in metal ion solutions and by evaporation. The photoluminescence (PL) was quenched upon immersion in ionic solutions of Cu, Ag, and Au but not noticeably quenched in other ionic solutions. Evaporation of 100 Å of Cu or 110 Å of Au was not ob…
Abstract The destruction of the crystal structure of kaolinite caused by mechanical forces was investigated by X-ray diffraction, thermal analysis, infrared spectroscopy, and specific surface area determination. Attention was also directed to the change of thermal reactions of milled kaolinite. Grinding experiments fo…
A synergistic effect exists when BTAH and iodide ions are used together to prevent the corrosion of copper in sulfuric acid. The nature of this effect has been studied systematically by using electrochemical techniques and x‐ray photoelectron spectroscopy. The synergistic effect is due largely to the formation of a fi…
Abstract Polytype diversity of hydrotalcite-like minerals is mainly a function of the nature of the interlayer anion. Among the varieties with CO 3 2− anions, only two- and three-layer polylypes having the same structure as manasseite and hydrotalcite have been confirmed. Stichtite and reevesite, which have been previ…
The photochromic effect of thin amorphous WO3 films, i.e., the coloration upon exposing the sample to ultraviolet light, has been investigated by means of optically excited surface plasmons. Due to the high sensitivity of this technique, it was possible to investigate the dynamics of this effect on a scale as short as…
Second-order characteristic beam parameters, including beamwidth and far-field divergence, are generalized for hard-edge diffracted fields. On the basis of, the so-called moments formalism these parameters are shown to propagate through ABCD optical systems according to laws similar to those applied to systems with no…
A formalism is presented for calculating the ordinary and extraordinary refractive indices for a uniaxial film with optical properties equivalent to those of a conically mounted zeroth-order lamellar grating. In the quasi-static limit (grating-period-to-wavelength ratio → 0) this treatment is exact for both dielectric…
The electrical potential difference between the interface and the bulk in TiO 2 is obtained as a function of temperature, oxygen pressure, and acceptor or donor doping from a space charge model that explicitly includes the high‐temperature lattice defect chemistry. Using defect equilibrium constants for TiO 2 from pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic determination of the flatband potential of transparent nanocrystalline zinc oxide filmsGareth Redmond, Angela O'Keeffe, Carol Burgess, Ciara MacHale, and Donald FitzmauriceCite this: J. Phys. Chem. 1993, 97, 42, 11081–11086Publication Date (Print):October 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions and magnetic ordering in rare earth metal nitronyl nitroxide chainsCristiano Benelli, Andrea Caneschi, Dante Gatteschi, and Roberta SessoliCite this: Inorg. Chem. 1993, 32, 22, 4797–4801Publication Date (Print):October 1, 1993Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio characterizations of molecular structures, conformation energies, and hydrogen-bonding properties for polyurethane hard segmentsH. SunCite this: Macromolecules 1993, 26, 22, 5924–5936Publication Date (Print):October 1, 1993Publication History Published online1 May…
A quantitative study of space charge solute segregation at grain boundaries in TiO 2 is conducted, using a new STEM method for the measurement of aliovalent solute accumulation. It is shown that the electrostatic potential at grain boundaries can be varied in sign and magnitude with doping, oxygen pressure, and temper…
A model is proposed that describes both reversible and irreversible photo-structural changes in vitreous and amorphous chalcogenides as resulting from recombination-induced bond rearrangements that accumulate during exposure time to produce a more disordered structure. The final light-saturated state depends on temper…
We present a theory of the stripe domain structure in a thin ferromagnetic film with single-ion easy-axis magnetic anisotropy and long-range dipole interactions, for a wide range of temperatures and applied magnetic field. The domains exist at temperatures below the reorientational phase transition from out-of-plane t…
The constrained sintering of films on substrates leads to a reduction in densification rate and may lead to processing flaws. This paper reports on a study of damage and cracking in sintering films, with particular emphasis on the growth of preexisting cracks. Experiments have been conducted with glass and polycrystal…
It is found that samples of crystalline germanium brought rapidly (1 s) to ambient pressure from 14 GPa transform to the so-called BC8 structure rather than to the ST12 structure that is found on slower pressure decrease. The BC8 phase is unstable at atmospheric pressure, but we have been able to record angle-dispersi…
Abstract β‐rhombohedral boron doped with carbon up to about 1 at% is investigated by X‐ray diffraction, by optical transmission spectroscopy in the spectral range of the absorption edge and its low energy tail, by I R reflection spectroscopy in the lattice vibration range, and by Raman scattering. The carbon atoms sub…
Persistent spectral hole burning in Sm2+-doped borate glasses is observed at room temperature. The possible number of holes is approximately five times larger than in halide glass systems because of the larger inhomogeneous linewidth and smaller hole width of borate glass. In this system the photoionization of trappin…