Materials Literature
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The 4f-4f transitions absorb electric dipoles, magnetic dipoles, or even higher electrical multiple radiations. These electric dipole transitions in the 4fn configuration are parity forbidden, however, as a result of the interaction of the central lanthanoid ion and surrounding ligands mixing into a 4fn con- figuratio…
Abstract In computer modeling of air guns the theory is often based on the assumption of an ideal freely oscillating spherical air bubble in an ideal fluid. Theoretical and experimental air-gun signatures do not match perfectly. Synthetic signatures are underdamped compared to real signatures. Several physical effects…
A nanocrystal structure and non-equilibrium solid solution of Fe-20 at.% Cu has been obtained after severe plastic deformation and additional heating. Thin disc samples were pressed at up to 11 GPa between Bridgman anvils and then deformed by rotating one anvil about the other. Cu does not normally form a solid soluti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-mediated gold aggregation on a metal cluster: syntheses, structures, dynamic behavior, and ligand addition reactions of the clusters (.mu.-H)nFe3(CO)9P[Au(PR3)]3-n (n = 0, 1, 2)Deborah L. Sunick, Peter S. White, and Cynthia K. SchauerCite this: Inorg. Chem. 1993,…
Abstract The main objective of this investigation is to obtain experimental data for the sulfuric acid hydrolysis of cotton and mechanically pretreated cotton fibres. These data indicate that some glycosidic bonds of cellulose have very high accessibility to catalytic ions. It was also shown that milling increases the…
The electron density in a naturally faced mineral crystal of MgCO 3 was re-measured with Mo Kα (λ= 0.71073 A) diffraction data, using extinction corrections that minimize differences between equivalent reflection intensities. The deformation electron density has 0.66 e A -3 , density maxima in the C-O bonds and 0.35 e…
Complete replacement of Cu by Fe in R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ leads to R${\mathrm{Ba}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ (R=Y and Eu). We investigated ${\mathrm{YBa}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ and ${\mathrm{EuBa}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ by seve…
The behaviour of specular reflectance of cobalt oxides on metal has been studied theoretically (CoO/Co system) and experimentally (Co3O4/Co system; the thin films are obtained by chemical spray pyrolysis) in the infrared region. CoO may be identified by a LO mode at 585 cm-1 and by a TO mode at 345 cm-1. Co3O4 is char…
Abstract A review of the works, in which the E‐phase of boron nitride had been obtained under various physical treatments, revealed that in all cases during the formation or isolation of the E‐phase the sample can be impurified with oxygen. An X‐ray spectral study of crystalline E‐phase obtained in the present work pr…
A 2500-particle molecular-dynamics simulation has been carried out for a two-dimensional continuum model whose classical ground state is a crystal with square symmetry. The interaction potential comprises two-body and three-body contributions. Evidence from both heating and cooling sequences indicates that the crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic polymerization of monomers containing functional groups. 7. Anionic polymerizations of N-alkyl-N-(4-vinylbenzylidene)aminesTakashi Ishizone, Nobuyuki Sueyasu, Kenji Sugiyama, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1993, 26, 25, 6976–6984Publicatio…
A neutron-diffraction study of Nd2Fe14−xSixB has shown that silicon preferentially occupies the 4c site in the transition-metal sublattice in Nd2Fe14B. Silicon also exhibits a moderate preference for the 8j1 site, is almost excluded from the 16k2 site, and avoids the 16k1, 8j2, and 4e sites. The silicon site occupancy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[3-(alkoxyphenyl)thiophenes]: synthesis and linear and nonlinear optical propertiesLucie Robitaille, Mario Leclerc, and Claire L. CallenderCite this: Chem. Mater. 1993, 5, 12, 1755–1761Publication Date (Print):December 1, 1993Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of first-row transition metal tellurolates. X-ray crystal structures of Mn[TeSi(SiMe3)3]2(dmpe), Fe[TeSi(SiMe3)3]2(dmpe)2, Fe[TeSi(SiMe3)3](Cl)(dmpe)2, and Co[TeSi(SiMe3)3](PMe3)3David E. Gindelberger and John ArnoldCite this: Inorg. Chem. 1993…
–Studies of binary Si/oxidant pyrotechnic systems have been extended by examination of the temperature profiles of Si/Sb2O3 and Si/KNO3 compositions. The burning rates of the Si/2O3 compositions (1.6 10 8.5 mm s-1) showed a maximum at ≃40% Si. Maximum heat of reaction was measured at ≃25% silicon. The temperature prof…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of solvent dynamics of inverted region electron transfer of cofacial porphyrin-porphyrin and porphyrin-chlorin complexesJeffrey M. Zaleski, Chi K. Chang, and Daniel G. NoceraCite this: J. Phys. Chem. 1993, 97, 50, 13206–13215Publication Date (Print):December 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTα-Effect in Menschutkin alkylationsK. R. Fountain, Linda K. Hutchinson, Debbie C. Mulhearn, and Yu Bo XuCite this: J. Org. Chem. 1993, 58, 27, 7883–7890Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface tension from pendant drop curvatureA. Lopez de Ramos, R. A. Redner, and R. L. CerroCite this: Langmuir 1993, 9, 12, 3691–3694Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https://pubs.acs.org/d…
The solid solutions Y 2−x Dy x O 3 (x=0.20,0.50,0.74,1.40,1.80) were obtained by ceramic technology. The crystal structures were refined from X-ray and neutron diffraction data measurements in the cubic space group Ia3 by the Rietveld method. The unit cell dimensions varied from 10.6056(4) Å to 10.6624(1) Å. The struc…
The effects of ionizing radiation on the retained polarization of lead zirconate titanate (PZT) thin films are examined. The retained polarization is the key parameter in measuring the radiation tolerance of the PZT storage element in a nonvolatile memory. Data from the retained polarization measurement show a larger…