Materials Literature
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Abstract Alkali metals dissolve not only in liquid ammonia but also in ethers, such as tetrahydrofuran (THF), 1.2‐dimethoxyethane (DME), and dimethyl ether of diethylene glycol (diglyme), blue solutions being obtained 1,2 . “Blue” solutions can be obtained only with rigorously purified reagents in full absence of mois…
Abstract Dilute deaerated aqueous polyethylene oxide solutions have been irradiated with 60 Co γ‐rays. The concentration dependence of the gel dose, the dose required for gelation, was found to vary with the initial molecular weight of the polymer used. For low molecular weight polymer, with increasing polymer concent…
A new type of natural pyrrhotite, orthorhombic 11C type (a = 6.892, b = 11.952, c = 5.744 x 11 angstroms), and the hexagonal 6C type (a = 6.89, c = 5.76 x 6 angstroms) are described. Their compositions are Fe(10)S(11) and Fe(11)S(12), respectively. Pyrrhotites stable in nature have essentially stoichiometric compositi…
The ionic conductivity of pure as well as NaF- and YF3-doped CaF2 and SrF2 crystals was investigated between room temperature and 900°C. The absorption of the crystals was measured before and after X-ray irradiation. The results are in accordance with an anti-Frenkel disorder. While for CaF2 only the formation energy…
The absorption structure of five light metals has been measured from the onset of K- and LII,III-absorption up to photon energies of 140 eV (170 eV for Be). The edges at the threshold are followed by several broad peaks which are distributed over the total energy region covered by these measurements. There is a striki…
The temperature and carrier-concentration dependences of the ${\mathrm{Pb}}^{207}$ and ${\mathrm{Te}}^{125}$ Knight shifts have been measured in both $n$- and $p$-type PbTe. Qualitatively similar data have been reported by others for ${\mathrm{Pb}}^{207}$ in PbSe. The very large shifts of ${\mathrm{Pb}}^{207}$ in $p$-…
The values of Slater–Condon (F2, F4, F6) and Racah (E1, E2, E3) interelectronic repulsion and Landé (ζ4f) parameters have been computed from the already observed visible and near-infrared absorption spectra of nineteen Pr(III) complexes. The decrease in F2 values of the complexes as compared to the free ion is greates…
Cubic ice Ic and hexagonal ice Ih were prepared in pressurizable dielectric cells at temperatures near − 110°C from the high-pressure ices II and IX. No differences were found between the dielectric properties of Ic and Ih. Freshly prepared samples exhibited longer relaxation times at low temperatures than those commo…
Single crystals of MgO have been additively colored by heating them in Mg vapor at temperatures from 1600 to 1800\ifmmode^\circ\else\textdegree\fi{}C and pressures up to 4000 Torr. The ${F}^{+}$ and ${F}^{\ensuremath{'}}$ optical absorption bands (due to anion vacancies containing one and two electrons, respectively)…
The room-temperature electrical resistivity of EuO is reported as a function of pressure up to 10 kbar. For the higher resistivity samples the pressure coefficient corresponds very closely to the observed shift of the optical absorption edge with pressure. Both the temperature and pressure dependence of the electrical…
Abstract The thermodynamics of the polymerization of acetone through the carbonyl group has been investigated in an attempt to find the limiting experimental conditions for producing high molecular weight polymer. Approximate values for the entropy and enthalpy of polymerization were estimated empirically from data pu…
Several aspects of electronic transport in nonmagnetic and magnetic transition metal oxides are reviewed. These include high- and low-temperature measurements of conductivity, the Hall effect and the Seebeck effect, and their analysis in terms of the electronic energy structure. Particular emphasis is put on the tempe…
This paper summarizes the results of an analytical study carried out for the purpose of determining the effects of cladding thickness and conductivity on fully developed heat transfer to liquid metals flowing in-line through unbaffled rod bundles. The study is based on slug flow and the assumption that the heat flux o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of trisilane by the Schlesinger methodPeter P. Gaspar, Carl A. Levy, and Gerald M. AdairCite this: Inorg. Chem. 1970, 9, 5, 1272–1273Publication Date (Print):May 1, 1970Publication History Published online1 May 2002Published inissue 1 May 1970https://pubs.acs.org…
Over the last several years, we have witnessed an upsurge in the quantity of research devoted to mesophase formation and properties.1 Of particular interest to chemists is the investigation of molecular structure requirements for liquid crystalline substances, and the variation of mesophase physical properties with co…
The variation of shock-induced phase-transition pressure with alloy composition has been observed for several Fe–Cr and Fe–Cr–Ni alloys through use of the inclined-mirror technique. It was found that transition pressures for Fe–Cr alloys varied continuously from the known 130-kbar value for pure iron to 230 kbar for 3…
Th e c rysta l s tru cture of sy nth e ti c Na2 Co.,, H2O. has been re fin ed us in g 1231 un iqu e x ray dif fr~c tlOn d a ta c~l ec l e d by the peak he ight m ~th o d on a diffractom e te r. R = 0.034. Th e unit ce ll is a -6.474(2), b -1O.724(3) and c=5.259(2) A with z = 4 a nd s pa ce gro up P2,ab. Th e ca lc ula…
Several environmental parameters influence the ability of Stauroneis anceps Ehr. to survive periods of dehydration to equilibrium with atmospheric humidity. Cells grown in soil-water are better able to survive desiccation than cells grown in defined medium and cells from older cultures survive better than those from y…
Abstract Various methods suggested for the determination of carboxyl groups in chemically modified celluloses suffer from some drawbacks. Attempts have been made to overcome the drawbacks of some of these methods. The influence of alkali‐sensitive reducing groups, enediol groups, and lactones on the carboxyl estimatio…
Abstract One objective of a new crosslinking system for NR is a vulcanizate possessing good strength and fatigue properties and a high resistance to reversion; a second is a vulcanizate with reversibly thermolabile crosslinks. The reaction of amine-chloroboranes with NR was expected to give carbon-boron-carbon crossli…