Materials Literature
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Neutron diffraction measurements and Mössbauer experiments on two Mg ferrites with slightly different cation distribution are reported. A comparison of the magnetic moments of the sublattices measured at 27 °K with the values expected on the basis of the Néel model leads to the conclusion that deviations from this mod…
There is evidence to indicate that some diffusely scattering substances are essentially highly defective lattices rather than made up of small domains diffracting incoherently with respect to each other. Equations have been derived for the diffraction profiles from such lattices; they are of a Cauchy type. Highly defe…
The Raman scattering of polytetrafluoroethylene has been studied as a function of temperature. The 575-cm−1 band is strong below the 19°C transition but weakens above 19°C, while the 595 band is absent below 0°C and increases in intensity with temperature. The 575- and 595-cm−1 bands are attributed to transplanar and…
The absorption spectrum of Tm3+:LaF3 was measured in the region 0.2–2.0 μ which encompasses all but one of the excited states in the 4f12 configuration. Centers of gravity of the observed crystal-field components of each level were computed and used as the basis for determining the free ion energy level parameters. In…
A first-principles self-consistent orthogonalized-plane-wave (SCOPW) energy-band calculation has been performed for cubic BAs using a nonrelativistic formalism and Slater's free-electron exchange approximation. These are the first fully self-consistent energy-band solutions reported for BAs. The imaginary part of the…
Infrared and Raman spectra have been recorded for room-temperature-phase, powdered samples of LiNO 3 , NaNO 3 , KNO 3 , RbNO 3 , CsNO 3 , AgNO 3 , and TlNO 3 . For the trigonal systems, the nitrate pairs LiNO 3 , NaNO 3 and RbNO 3 , CsNO 3 give almost identical spectra. For the orthorhombic systems, AgNO 3 and TlNO 3…
A continuum theory of elastic dielectrics including polarization gradient is obtained as the long-wave approximation of a theory of lattice dynamics for the shell model of cubic ionic crystals. The additional energy associated with the formation and relaxation of a free surface is obtained by considering the unbalance…
Raman spectra of small single crystals of both the trigonal and tetragonal forms of germanium dioxide have been obtained. Frequencies and symmetries of the Raman-active optical phonons are given, and comparison is made with isomorphic $\ensuremath{\alpha}$ quartz and rutile. The temperature dependences of the spectra…
ETTRINGITE (Ca6[Al(OH)6]2(SO4)3.26H2O) occurs as a natural mineral, and is technically important as a hydration product of Portland and supersulphated cements and in its use, as satin white, for coating paper. It forms hexagonal, prismatic crystals which in synthetic material are often highly elongated. Bannister, Hey…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility isotherms for calcium fluoride in nitric acid solutionMalcolm W. Wilding and Donald W. RhodesCite this: J. Chem. Eng. Data 1970, 15, 2, 297–298Publication Date (Print):April 1, 1970Publication History Published online1 May 2002Published inissue 1 April 1970https:/…
Abstract The effect of finite elongation on superposed infinitesimal torsional oscillations has been determined on two propellants, a carbon black‐filled rubber and Solithane 113 (Galcit I), as a function of temperature at various fixed frequencies. Torsional storage modulus—temperature data for carbon black‐filled ru…
Abstract Elastomers, based on cellulose fibers, were synthesized by grafting ethyl acrylate onto fibers preirradiated by a high‐energy electron beam. The rheological properties and fine structure of the elastomers were investigated in order to determine factors in development of rubber‐like elastomeric behavior. Mecha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic functions of neptunium(V) and neptunium(VI)John R. Brand and J. W. CobbleCite this: Inorg. Chem. 1970, 9, 4, 912–917Publication Date (Print):April 1, 1970Publication History Published online1 May 2002Published inissue 1 April 1970https://pubs.acs.org/doi/10.102…
Wettability of FEP Teflon® (a perfluorinated ethylene-propylene copolymer) is vastly improved by heterogeneous nucleation and crystallization in contact with gold, a high surface free energy substrate. The critical surface tension of wetting (γe) increases from 18.8 dynes/cm to 40.4 dynes/cm. We compute that this rise…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxo Synthesis TechnologyHermann Weber and Jurgen FalbeCite this: Ind. Eng. Chem. 1970, 62, 4, 33–37Publication Date (Print):April 1, 1970Publication History Published online1 May 2002Published inissue 1 April 1970https://pubs.acs.org/doi/10.1021/ie50724a006https://doi.org/10…
Abstract We have prepared a variety of binuclear and trinuclear complexes of the composition Cu-(TDSB)·MX2 and 2Cu(TDSB)·M(ClO4)2, where Cu(TDSB)=N,N′-ethylenebis(salicylideneiminato)copper(II) or N,N′-1,2-propylenebis(salicylideneiminato)copper(II), and M=Co, Ni, Cu and Zn. A few higher polynuclear species were also…
Pearlitic flake-graphite grey cast irons have long been widely used for the manufacture of diesel-engine combustion-chamber components. Nonetheless, very few pertinent high-temperature data are to be found in published work. The investigation described attempts to enlarge current knowledge on the high-temperature beha…
The electric-field $g$ shift of ${\mathrm{Yb}}^{3+}$ in the scheelite series CaW${\mathrm{O}}_{4}$, SrW${\mathrm{O}}_{4}$, and BaW${\mathrm{O}}_{4}$ has been measured. In SrW${\mathrm{O}}_{4}$, and especially in BaW${\mathrm{O}}_{4}$, the Yb ion is much smaller than the cation, and we find a substantial increase in th…
After repeated switching, ferroelectric ceramic plates will exhibit aging evident in hysteresis loops as a marked decrease in remanent polarization (Pr) and an increase in coercive field (Ec). A hot-pressed ceramic having a composition of 65% lead zirconate-35% lead titanate with 2 at.% lanthanum and having a grain si…
The morphological appearance of cotton fibers scoured at 100 and 140°C then subjected to a treatment with cellulase, has been examined as a function of the enzymatic action time. The rate of enzymatic digestion varies according to the region of the secondary wall under consideration, and examina tion of the degraded f…