Materials Literature
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As a liquid wire migrates through a solid in a thermal gradient, the cross-sectional shape of the liquid is deformed from the symmetric equilibrium shape. A force model of the thermomigration process is derived to calculate both the nonequilibrium shape and the effect of wire size on the migration velocity for thermal…
Copper formate tetrahydrate is a layered hydrogen-bonded substance which undergoes a phase transition from a state in which hydrogen atoms are positionally disordered into an ordered state in which two-dimensional ferroelectric planes are stacked so that the polarization alternates in sign from layer to layer. We repo…
The equilibrium cation distribution and the valence state on tetrahedral or octahedral sites in copper ferrites Cu1−δFe2+δO4 have been derived by taking account of site exchange not only of cationic nuclei but also of valence electrons. The calculated cation distribution has shown satisfactory agreement with experimen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of the new heteronuclear hydride-bridged anion MoWCl8H3- and determination of the metal-hydrogen bond distance in Mo2X8H3- (X = chlorine, bromine) by infrared spectroscopyV. Katovic and R. E. McCarleyCite this: Inorg. Chem. 1978, 17, 5, 1268–1270Publication Date…
A continuum theory treating the simultaneous scattering of phonons by fixed dislocations, by the mobile dislocation core and by three-phonon processes (N-processes) in a crystal of finite dimensions, is described. In the theory the scattering of phonons is calculated with the aid of non-linear elasticity theory, takin…
Abstract The nucleation of CaCO 3 scales on copper, graphite, aluminium and mild steel heat transfer surfaces at surface temperatures 54–56°C, from turbulent solutions (Re 22,000) of bulk temperature 30 °C, has been studied using thermal resistance and corrosion potential measurements and scanning electron microscopy.…
In order to characterize the effect caused by the atomic substitution on the ferroelectric phase change in ${A}_{\mathrm{V}}{B}_{\mathrm{VI}}{C}_{\mathrm{VII}}$ compounds, we have studied a series of ${\mathrm{Bi}}_{x}{\mathrm{Sb}}_{1\ensuremath{-}x}\mathrm{SI}$ mixed crystals. The Raman scattering, together with diel…
The crystal structure of a fluor-riebeckite of composition (NaO.037KO.290) (CaO.013Na!.987) (Lio.334 Mgo.o lIMn 0-18 2Fe 2+ 2.2 9 9Fe 3+ 2.025 Tio.o! 6A10.! 03) (Alo.252Si7.748)022(OHo.892FI.253) has been refined by a full-matrix least-squares method using threedimensional counter-diffractometer X-ray data; the R inde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential heat of chemisorption. 1. Chemisorption of water on zinc oxide and titanium dioxideMahiko Nagao, Koji Yunoki, Haruto Muraishi, and Tetsuo MorimotoCite this: J. Phys. Chem. 1978, 82, 9, 1032–1035Publication Date (Print):May 1, 1978Publication History Published on…
Processes for radiative and nonradiative decays of the most important emitting levels 5D0, 5D1, and 5D2 of the europium ion doping KY3F10 are investigated. Both magnetic and electric dipole transition probabilities are calculated for the transitions between Stark levels. The ’’forbidden’’ transitions are discussed. Fr…
During the γ-irradiation and UV-light photolysis of polyvinyl chloride) (PVC), free radicals are formed which may be detected by electron spin resonance (ESR) spectroscopy. In this paper interpretations of the ESR spectra and decomposition mechanisms of PVC are presented.
Abstract A crystal field analysis of the reported optical spectra of Nd 3+ in the series of aluminium and gallium garnets LuAG, YAG, GGG, LuGG, and YGG is presented. The reliability of the crystal field parameters determined in this way is confirmed by comparison with ESR g ‐values given in the literature. The results…
Abstract Ribbon‐like lamellar single crystals of cellulose II are grown from dilute aqueous solution of cellulose triacetate (number‐average degree of polymerization (DP)‐15) by deacetylation and consequent precipitation. The best results are obtained with methylamine as the deacetylation reagent at 90°C. Electron dif…
Dynamic mechanical properties of poly(methyl methacrylate) (PMMA) filled with mica flakes (M) or glass beads (G) were investigated as functions of particle size and filler concentration. With increasing particle size, dynamic modulus E′ slightly decreases for system G, while it increases rapidly at first and then appr…
The sound velocities in perovskite-type CsPbCl 3 were measured around the three successive structural phase transition points at 37, 42, and 47°C using the ultrasonic pulse-overlap method. "Detwinned" samples were used, so that the measured velocities can be connected with the elastic constants in each phase. The resu…
Quantitative X‐ray diffraction and microscopy were used to study the morphology development and overall crystallization rate between 900° and 990°C of MgO‐Al 2 O 3 −SiO 2 glasses with added ZrO, TiO 2 , CaF 2 , or CeO 2 . Three basic stages of micro‐structural development were distinguishable: I, an induction period,…
Abstract The pH at the zero point of charge (ZPC) has been used to characterize the electrochemical properties of soils. To date, most studies have focussed on soils high in oxides with low phyllosilicate content. The study reported here attempts to use ZPC determinations to characterize the surface charge characteris…
The low-temperature (2-100 K) polycrystalline magnetic properties of V ( a ~ a c )M~ ,n ( a ~ a c )a~n,d Mn(trop)3 are reported [Hacac = 2,4-pentanedione and Htrop = tropolone]. For V(acac), the zero-field splitting (D) is 7.7 cm-', gI1 = 1.96 and g , = 1.78, all compatible with the reinterpreted optical spectrum. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of coordination compounds. A joint NQR and x-ray investigation of trialkylphosphine-gallium trichloride adductsJohn C. Carter, Gerard Jugie, Renee Enjalbert, and Jean GalyCite this: Inorg. Chem. 1978, 17, 5, 1248–1254Publication Date (Print):May 1, 1978Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculated γ Effects on the 13C-NMR Spectra of 3,5,7,9,11,13,15-Heptamethylheptadecane Stereoisomers and Their Implications for the Conformational Characteristics of PolypropyleneAlan E. TonelliCite this: Macromolecules 1978, 11, 3, 565–567Publication Date (Print):May 1, 197…