Materials Literature
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Successive phase transitions in the mixed crystal with perovskite structure (1-x)ABO3+xA′B′O3 are discussed on a phenomenological basis. After a short review on the experimental facts, a simple scheme is proposed to predict the phase diagrams of mixed crystals when the model parameters of constituent substances are kn…
Abstract of the system Ca-Cu-P resulted in the discovery of CaCu 4 P 2 . The compound crystallizes in a trigonal-rhombohedral structure (hexagonal axes: a = 403.6(1) pm, c = 2227.2(2) pm; space group R3̄m) which contains structural elements of the compound CU 3 P.
Statistical Green's function theory has been successfully applied to study the ferroelectric phase transitions in the Rochelle Salt and its deuterated form with two sub-lattice pseudo-spin model containing spin-phonon interaction terms. The Blinc-de Gennes model parameters have been calculated for both of the salts. A…
Abstract A molecular LCAO Hartree‐Fock procedure was used to calculate total energies of axially stretched normal paraffins containing up to nine carbon atoms. The results are used to model the mechanical properties of polyethylene.
Abstract A purified, well characterized sample of polybenzimidazole (PBI) has been studied by fluorescence spectroscopy in order to obtain information concerning molecular aggregation in solution. Fluorescence and excitation spectra of PBI and a model compound have been measured in N , N ‐dimethylacetamide (DMA) and i…
Abstract Hydrothermal alteration products of serpentinite near Takovo, Yugoslavia, were studied by X-ray powder diffraction and chemical analysis. A zone of mainly blue clays adjacent to the hydrothermal vein contains intimately associated chromium kaolinite and tosudite at higher hypsometric levels and chromium hallo…
The ordered phase concerning the Ag distribution of a superionic conductor Ag 3 SBr was discovered below 128 K. The transition heat and the entropy change were measured to be 0.23 kcal/mol and 1.77 cal/mol·deg respectively. The transition is of the first order but is close to the second order one. The crystal structur…
For pressurized water reactor fuel, to correlate clad failure characterization and localization methods with primary cooling water gamma measurements, it was necessary to define the set of equations describing fission product (FP) generation and transport. Such a technique has been developed by the French Commissariat…
From their photoelectrolysis spectra we have determined the lowest band gaps of Cd2SnO4, CdIn2O4, and Cd2GeO4 to be 2.12 (indirect), 2.23 (forbidden), and 3.15 eV (indirect), respectively; their flat-band potentials are +0.18, +0.25, and −0.82 V (SCE), respectively. This combination of band gaps and flat-band potentia…
Abstract The hitherto unknown title compounds were prepared by a disproportionation reaction starting from elementary rubidium and indium monosulfide. Rb 4 ln 2 S 5 crystallizes in the triclinic system (P1̄) with the lattice constants a = 931.7(2); b = 1097.6(3);c = 761.2(2)pm; a = 111.32°(2); β = 94.70°(2); γ = 103.7…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic and cooperative Jahn-Teller distortions in copper pyridine N-oxide complexes, Cu(pyO)6X2 (X = tetrafluoroborate(1-), perchlorate(1-), and nitrate(1-): structural and EPR studies of pure and zinc-doped systemsJ. S. Wood, C. P. Keijzers, E. De Boer, and A. ButtafavaCit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of monodentate (tertiary phosphine)nickel(II) complexes NiX2(PR3)2, NiX2(PMe3)3, and (NiX(PMe3)4)(BF4) with carbon monoxide. Crystal and molecular structure of NiI2(CO)(PMe3)2Christine Saint-Joly, Alain Mari, Alain Gleizes, Michele Dartiguenave, Yves Dartiguenave, a…
Abstract The luminescence properties of Bi 3+ ‐activated Cs 2 NaYCl 6 crystals are presented. The Bi 3+ ion (6s 2 ) occupies an Y 3+ site which has cubic symmetry. Excitation in the A absorption band yields 3 T 1u emission. Excitation in the C absorption band, however, yields 3 T 1u and 3 A 1u emission, because both l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperexchange in copper(II) dimers. 1. Synthesis, characterization, and magnetic behavior of the novel di-.mu.-bromo-bis[bromo(dimethylglyoxime)copper(II)], [CuBr2(dmgH)]2Michel Megnamisi-Belombe and Mark A. NovotnyCite this: Inorg. Chem. 1980, 19, 8, 2470–2473Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal lattice control of unimolecular photorearrangementsJohn R. SchefferCite this: Acc. Chem. Res. 1980, 13, 8, 283–290Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 August 1980https://pubs.acs.org/doi/10.1021/ar50…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-induced charge injection in functional crown ether vesiclesKeith Monserrat, Michael Graetzel, and Pierro TundoCite this: J. Am. Chem. Soc. 1980, 102, 17, 5527–5529Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 A…
It has recently been proposed that the anomalous specific heat of uranium dioxide be ascribed to the effect of electronic defects rather than Frenkel disorder on the union sub-lattice. We here present calculations showing that the entropy contribution from electronic defects is large enough to make a major contributio…
Abstract The Tulameen coal field is part of an Eocene nonmarine basin which received extensive volcaniclastic sediments due to its location within an active magmatic arc. Bentonite partings in the coal originally consisted of glassy rhyolitic tephra with phenocrysts of sanidine, biotite, and quartz. During the initial…
A method of visualizing the 180°-domain structure in TGS type crystals by means of nematic liquid crystals (NLC) is described. The possibility of visualization is due to the different orientation of NLC molecules on the domains with opposite orientation. The method enables the observation of static domain structure on…
The spectroscopic constants of hydroxyl ions formed from hydrogen, deuterium, and tritium in a potassium tantalate (KTaO3) host have been determined. These isotopes were found to diffuse readily either into or out of KTaO3 single crystals. At T=77 K the infrared absorption band due to the OH−, OD−, or OT− stretching v…