Materials Literature
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Abstract The reaction products of gaseous ZrCl4 with ammonia were ZrCl4·2NH3 at 300 °C; ZrCl4·2NH3, ZrClN, and NH4Cl at 350–700 °C; ZrCl4·2NH3, ZrClN, ZrNx, Zr3N4, and NH4Cl at 750 °C; ZrClN, ZrNx, Zr3N4, and NH4Cl at 800–950 °C: ZrNx, Zr3N4, and NH4Cl at 1000–1050 °C; and ZrNx, NH4Cl, and HCl at 1100–1400 °C. The N/Z…
Zirconium pyrovanadate powders prepared from solution precipitation and by solid‐state reaction were hot pressed below 800°C. Unit cell parameter and thermal expansion were found to have a negative slope above 150°C, attributed to flexing of the bond angles in the structure. Thermal expansion coefficient determined wa…
Abstract 8-Oxabicyclo[3.2.1]octan-3-one derivatives serve as excellent models that elucidate factors controlling the reactivities and selectivities in the Baeyer-Villiger oxidation. The regioselectivity of the oxidation with trifluoroperacetic acid is markedly affected by the electronic properties of substituents at p…
The chemical shifts of the Ge 3d, 3p 3/2,1/2 and Se 3d, 3p 3/2,1/2 photoelectron lines were measured for the amorphous Ge–Se system and those of the Ge photoelectron lines are corrected for Auger parameter shifts. According to the valence shell potential model, the ratio of the chemical shift in the amorphous Ge–Se sy…
A phenomenological model has been derived for thermally stimulated open-circuit current measured on negatively charged polytetrafluoroethylene electret film. The model is based on trap controlled release of negative charge carriers using approximations justified by thermally stimulated current and mean charge depth re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic decomposition of gaseous sulfur trioxideR. D. Brittain and D. L. HildenbrandCite this: J. Phys. Chem. 1983, 87, 19, 3713–3717Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https://pubs.acs.o…
An experimental study was made on the collapse of a gas bubble attached to a solid wall by a shock wave. The collapse process of the bubble and the induced impact wall pressure were measured simultaneously by means of a high speed camera and a pressure transducer, respectively. Consequently, it was found that the impa…
Magnetic properties of iron nitride particles prepared with reactive gas evaporation method were investigated. Major products for higher NH3gas pressure region is γ'Fe4N and αFe. For lower pressure region αFe was produced, which was oxidized to Fe3O4after exposure to air. It is found that particles consist of γ'Fe4N a…
Stress transmission through the compact, die wall friction, and the radial/axial stress ratio were investigated using a spray‐dried alumina powder containing 2.3% polyvinyl alcohol binder, stored at 15, 55, or 92% rh, and an unlubricated/lubricated steel die for pressing. Stress transmission was enhanced by lubricatin…
The high pressure phase transition of cinnabar (α-HgS) was studied by energy dispersive x-ray diffraction using a synchrotron x-ray source. The cinnabar crystal structure was found to transform to the sodium–chloride structure at about 130 kbar. The lattice parameter of the new phase was determined to be 5.070±0.005 A…
Ca2+ (1-5 mM) and lanthanide (20-250 microM) ions enhance the rate of polymerization of purified calf skin collagen (1.5 mg/ml) at pH 7.0 in the presence of 30mM-Tris/HCl and 0.2 M-NaCl. Both the nucleation phase and the growth phase of polymerization are accelerated. The activation energy of the growth phase, 239.3 +…
We investigate the origin of the deep level luminescence from Czochralski-grown Si crystals annealed at about 450°C in relation to “thermal donors” (TD's). A sharp line appears at 0.767 eV in luminescence spectra at 4.2 K and 77 K. The appearance condition of this line coincides with that of the TD's. The intensity of…
Enthalpy relaxation processes in a B,O 3 glass were investigated calorimetrically in the temperature region from well below to near the glass‐transition temperature T g . The low‐temperature ( T a T g ‐ 100 K) or sub‐sub‐ T g anneals stabilize the glass structure. On heating, the annealed sample shows an excess endoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic properties of single- and double-MoFe3S4 cubane-type clustersP. K. Mascharak, G. C. Papaefthymiou, W. H. Armstrong, S. Foner, R. B. Frankel, and R. H. HolmCite this: Inorg. Chem. 1983, 22, 20, 2851–2858Publication Date (Print):September 1, 1983Publication History…
We have quantitatively observed a large fast component in the laser induced thermal grating in nematic liquid crystal films. This effect can be successfully utilized in submillisecond and high spatial frequency four wave mixing processes with low power lasers.
The behavior of aggregated powders during compaction was studied using powders differing only in their aggregate size distribution. The relations between aggregate size distribution, compaction pressure, and green density were determined. The crushing of aggregates during compaction was followed by determining the cha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic behavior of automotive catalysts. 2. Carbon monoxide conversion under transient air fuel ratio conditionsRichard K. Herz, Joanna B. Kiela, and Jeffrey A. SellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 3, 387–396Publication Date (Print):September 1, 1983Publ…
The alkali metal thermoelectric converter (AMTEC) is a thermally regenerative electrochemical device for the direct conversion of heat to electrical energy. It is characterized by high potential efficiencies and no moving parts, which makes it a candidate for space power applications. This paper presents a review of A…
Abstract Total integrated and photon correlation light scattering have been used to study two samples of poly(1,4‐phenylene‐2,6‐benzobisthiazole) (PBT) representing two methods of precipitation to recover the polymer from the polymerization solvent. Some details of the light‐scattering instrument are given. It is foun…
Microcavity formation in engineering polymers exposed to boiling water has recently been noted in the technical literature. This study describes this observation and presents photomicrographs of the microcavity morphology. The microcavities are lens-shaped cracks emitting from a nucleation site with regular concentric…