Materials Literature
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Chemical stabilization of β‐cristobalite has been achieved using two methods: (1) incorporating “stuffing” cations Na, Ca, Cu, and Sr into the cavities in the tectosilicate framework, as previously reported, and (2) without “stuffing” cations, by substituting AlPO 4 into the framework. XRD, TEM, FTIR, DSC, and solid‐s…
The layered compounds, KMP2Se6(M = Sb, Bi), have been prepared by the reaction of Bi(Sb) with a molten alkali-metal polyselenophosphate flux.
Within the local spin density approximation (LSDA) of density functional theory, calculations of both the diagonal and off-diagonal conductivity of NiMnSb and PtMnSb are presented. The similar electronic structures of these two materials yield similar diagonal conductivities while the larger spin-orbit coupling of Pt…
With a view to studying the optical, structural and magnetoelectric properties, single crystals of the hausmannite CuCr2O4 have been grown by a high temperature solution method, based on the thermal decomposition of K2Cr2O7 in the presence of CuO. X-ray powder refinements at room temperature indicate that the crystal…
Soils suppressive to Thielaviopsis basicola typically have low pH values and high levels of exchangeable aluminum (Al). A series of experiments was conducted to determine the sensitivity of T. basicola to Al. All experiments were conducted in Al-amended carrot agar medium buffered at pH 5.0, except for experiments to…
The problem of modifying the harmonic power flow analysis to permit the inclusion of nonlinear anisotropic transformers and computation of their iron-core (and copper) losses are discussed. The nonlinear model used for transformers is capable of simulating saturation of iron-cores, anisotropy of laminations, and the i…
The syntheses of four chiral laterally fluoro-substituted propiolate esters are described, along with transition temperatures, ferroelectric properties, phase diagrams and related data. The position of the fluoro-substituent was found to influence dramatically the formation of twist grain boundary (TGB A* and TGB C*)…
Silicon nitride was produced via direct nitridation of silicon powder, using nitrogen with 10–40 vol% hydrogen, in a fluidized‐bed reactor, 55 mm in diameter, operated at temperatures in the range of 1200–1390°C. Hydrogen enhanced the nitridation of silicon toward its completion. The overall conversion of silicon as w…
Abstract The crystal structures of two complexes of the 9-(9H-fluoren-9-ylidenephenylmethyl)-9H-fluoren-9-yl stable radical with benzene (BDPA–Bz) and acetone (BDPA–Ac) have been determined by X-ray diffraction at room temperature. They are an isostructure of a monoclinic system with a space group of P21/n. For BDPA–B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew mono- and dinuclear titanium(III) complexes. The crystal structure of and exchange coupling in [{LTiIII(NCO)2}2(.mu.-O)] (L = 1,4,7-trimethyl-1,4,7-triazacyclononane)Peter Jeske, Karl Wieghardt, and Bernhard NuberCite this: Inorg. Chem. 1994, 33, 1, 47–53Publication Date…
Any discussion about “mesophases” and, especially, about “liquid crystals” might be thought of as dealing with only a marginal field of science. However, liquid crystals have in actuality become a consumer product with many everyday applications, substantiated by several examples in Chapter 6 as well as in Section 4.7…
Abstract Incongruent vanadium oxide vaporization of yttrium orthovanadate (YVO 4 ) melt generates changes in both oxygen and yttrium‐vanadium (YV) stoichiometry. Slightly modified YVO 4 or YVO 4 + Y 8 V 2 O 17 phases are formed from continuously changing melt systems depending on their starting compositions. The occu…
Abstract Natural rubber materials reinforced with cellulose fibres have been studied with respect to crosslink density, tensile strength and stress relaxation. The fibres have been grafted with butadiene or divinylbenzene by plasma treatment. Chemiluminescence analysis was used to indicate the grafting on the surface…
We have investigated optical properties of thermally grown SiO 2 layers within the thickness range 150 to 500 nm. The complex dielectric constant ε(ν˜) can be represented by six Lorentz-Gauss oscillators, which allow us to determine the optical constants of SiO 2 films by fitting IR transmittance spectra. The spectra…
The current injection into metal/porous Si/bulk Si diodes is investigated by transport and photoresponse measurements. Under low forward bias, the diode current is determined by the space charge region at the porous Si/bulk Si interface. The activation energy of the photovoltage shows that holes are injected into poro…
The liquid-crystal properties are reported for a series of multinuclear phthalocyanines containing either two or three macrocyclic ring units. All but one of the compounds, the ‘dimer’ with the shortest spacer group between the two rings, exhibit discotic columnar mesophase behaviour. On cooling from the isotropic liq…
The molecular and crystal structure of [Fe3(CO)12] has been reinvestigated from single-crystal X-ray diffraction data collected at 100, 160, 250 and 320 K. The asymmetric bridging carbonyl ligands become progressively more symmetric as the temperature is decreased. At the lowest temperature the molecule possesses near…
The structure of two polymorphs of manganese dioxide, λ-MnO 2 and γ-MnO 2 and the spinel oxide LiMnO 2 have been refined by Rietveld analysis of powder neutron diffraction data. λ-MnO 2 , Fd3m, a=8.0639(3) A, R Bragg =1.81%, γ-MnO 2 , Pnam, a=9.3229(11) A, b=4.4533(7) A, c=2.8482(3) A, R Bragg =1.34% and LiMn 2 O 4 ,…
The triple-decker chromium complexes [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[A]–(A = PF6, SbF6) can be prepared in high yield by oxidation of [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)] with either [Fe(η5-C5H5)2]+[A]–(A = PF6, SbF6); the single crystal X-ray structure determination for [(η5-C5Me5)Cr(µ2:η5-P5)Cr(η5-C5Me5)]+[SbF…
Mechanical and electrical properties of filled epoxy were evaluated by accelerated aging under high humidity and high temperature. Significant changes in these properties arose from the slight water absorption. The presence of internal and irreversible flaws such as microscopic damage probably associated with the elas…