Materials Literature
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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…
Polarized single-crystal Raman spectra of benitoite (${\mathrm{BaTiSi}}_{3}$${\mathrm{O}}_{9}$) were gathered and atomic displacements have been assigned to each line in the spectra from our interpretations of the Raman data, from determinations by Adams and Gardner in an earlier study, and from determinations by latt…
The Aurivillius phase Bi2WO6 has been found to undergo a phase transition at 933 K from space group Pca21 to Aba2 in addition to the well characterised first order transition at 1233 K. The structural phase transition can be seen to have occurred via a mechanism of rigid unit rotation of WO6 octahedra around the cryst…
Abstract Commercial samples of high density, linear low density, and low density polyethylene were modified by injection of low concentrations of free radical initiator during extrusion. Molecular properties monitored included molecular weight distribution, degree of unsaturation, and branching. When the polyethylene…
A collagen-impregnated graft, called Hemashield, has been used clinically; however, some complications such as pyrexia, fluid accumulation, and unusual scar formation around the graft have been reported. To understand the cause of these problems, the graft was examined both in vivo and in vitro. Endotoxin and (1-3)bet…
Chemical Potential Diagrams for Fe‐Cr‐Li‐K‐C‐O System: Thermodynamic Analysis on Reaction Profiles Between Alloys and Alkali Carbonates, Yokokawa, Harumi, Sakai, Natsuko, Kawada, Tatsuya, Dokiya, Masayuki, Ota, Ken‐ichiro