Intervalence Transitions in Mixed Valence Bis(tetrathiafulvalene) Compounds
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Environmental SEMs: A New Way to Look at Samples
Abstract A new class of SEM has evolved over the past few years which provides some startling capabilities never before available to electron microscopists. These instruments, typically referred to as environmental SEMs or variable pressure SEMs. have opened up a host of new applications that are difficult or impossib…
MOLECULAR ORBITAL STUDY OF THE FRAGMENTATION MECHANISM ON 5-HYDROXYTETRAZOLE
The tautomerism of 5-hydroxytetrazole is discussed on the basis of its fragmentation patterns and molecular orbital calculations by MNDO and PM3 methods.The calculated results of the fully optimized structures of 5-hydroxytetrazole and radical cations indicate that, in the gaseous phase, the enol form is energetically…
Operational Problems with Uranium Pots Due to Helium Blanketing
Extensive experience with the refilling of the Amersham Mk IV 1.85 PBq uranium pots has shown that helium-3 resident in the uranium matrix causes “blanketing” of the metal surface and subsequent operational problems. This paper reviews the operational procedures and results observed at Ontario Hydro’s dispensing facil…
Extrapolated partial molar densities of SO 3 , P 2 O 5 , and other oxides in silicate melts
Partial molar densities of oxides in natural silicate melts can be estimated to useful precision by exploiting their strong correlation with densities of the corresponding solid oxides, reflecting the close structural similarity between silicate solids and silicate melts. Using this extrapolation method, partial molar…
Methane Elimination During Silation of Partially Dehydroxylated .gamma.-Alumina
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethane Elimination During Silation of Partially Dehydroxylated .gamma.-AluminaStefan V. Slavov, Karl T. Chuang, and Alan R. SangerCite this: Langmuir 1995, 11, 10, 3607–3609Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published iniss…
Strength Measurements of Monolithic SiC and A1 2 O 3 /SiC Composites after Exposure to Coal Slag
Four Si‐based ceramics—siliconized SiC (Si‐SiC), sintered α‐SiC, and two grades of SiC‐particulate‐reinforced A1 2 O 3 —were exposed to a typical western coal ash with high calcium content (Wyodak) and a typical eastern coal ash rich in iron (Illinois #6) at two temperatures for 300 h in a muffle furnace. After exposu…
Design of a Second Generation Secondary Enclosure clean-Up System
An upgraded version of a metal hydride based clean-up systema for tritium gloveboxes has been recently designed. An earlier version of a prototypical, recirculating system has been under evaluation in tritium service at OHT for nearly 2 years. A metal getter alloy, Zr2Fe, is used to remove tritium and trace impurities…
Reederite-(Y), a new sodium rare-earth carbonate mineral with a unique fluorosulfate anion
Other| October 01, 1995 Reederite-(Y), a new sodium rare-earth carbonate mineral with a unique fluorosulfate anion Joel D. Grice; Joel D. Grice Canadian Museum of Nature, Research Division, Ottawa, ON, Canada Search for other works by this author on: GSW Google Scholar Robert A. Gault; Robert A. Gault Search for other…
In-Bed Accountability of Tritium in Production Scale Metal Hydride Storage Beds
An “in-bed accountability” (IBA) flowing gas calorimetric measurement method has been developed and implemented to eliminate the need to remove tritium from production scale metal hydride storage beds for inventory measurement purposes. Six-point tritium IBA calibration curves have been completed for two, 390 gram tri…
Titanocene Complexes Based on Benzenehexathiolate Derivatives and 2,3,6,7‐Tetrachloronaphthalenetetrathiolate
Abstract The synthesis and properties of the new (dithiolato)titanocene complexes 4a‐d, 6, 9 are described. The ligands of these complexes are derived from sodium benzenehexathiolate or 3,4,7,8‐tetrachloronaphthobis[1,2]dithiole. Complexes with one, two and three (dithiolato)titanocene units were prepared by use of th…
A High-Temperature Furnace for In Situ Small-Angle Neutron Scattering during Ceramic Processing
The design and operation of a new research furnace, optimized for small-angle neutron scattering experiments at a steady-state nuclear reactor with a cold source, are presented. The apparatus enables the study of thermal processing of materials, such as the sintering behavior in ceramics, through the measurement of th…
Hydrogen Permeation and Diffusion in Beryllium
A precise hydrogen permeation experiment for beryllium was conducted at a temperature ranging from 735 to 1000 K under hydrogen gas pressure of 101 to 103 Pa. Diffusion coefficient and permeation coefficient were determined from the steady state penneation and time transient penneation independently. The steady state…
Time-of-flight analysis of the plume dynamics of laser-ablated 6H-silicon carbide
The mass and velocity distributions of neutral species, ejected from a laser-ablated 6H-SiC target, are measured by time-of-flight mass spectroscopy. The laser-generated plume is shown to consist of atomic silicon and carbon and small neutral clusters. Measured values of the mean kinetic energies of neutral Si and SiC…
Niobium Oxide Electrochromic Thin Films Prepared by Reactive DC Magnetron Sputtering
Niobium oxide electrochromic thin films were prepared by reactive DC magnetron sputtering method. Electrochromic properties of prepared films strongly depended on the substrate temperature during sputtering. The sample with a substrate temperature of 500° C was well crystallized and showed excellent electrochromism. I…
Blends of thermotropic liquid crystalline polyesters and poly(butylene terephthalate): Thermal, mechanical, and morphological properties
Abstract Blends of poly(butylene terephthalate) (PBT) with three different thermotropic liquid crystalline polyesters (TLCPs) were prepared. The first TLCP (HBH‐6) consists of diad aromaticester type mesogenic units and the hexamethylene spacers along the main chain, and the second (TB‐S6) is a wholly aromatic polyest…
Application of chemometric methods in Raman spectroscopic studies of molten salt system containing MgCl2‐KCl: Experimental evidence for existence of Mg2Cl dimer and its Raman spectrum
Abstract Investigation of the Raman spectra of the molten MgCl 2 ‐KCl system by the use of factor analysis indicates that the melt is a two‐component system involving equilibrium between MgCl and Mg 2 Cl . The pure Raman spectra corresponding to these two species are recovered from the broad features via a self‐modeli…
Dipolar polarization in Ba(Ti1−xSnx)O3
The measurements of linear expansion and remanent polarization have been performed for polycrystalline samples of Ba(Ti1−x ,Sn x )O3, (BTS-x. x = O, 0.05. 0.10, 0.20). The results obtained from the dilatometric investigations confirm the existence of the dipolar polarization Pd below 620 K, which has been previously o…
Dynamics of uni and biaxial deformation and its effects on the thickness uniformity and surface roughness of poly (ether ether ketone) films
Abstract The uniformity of films and their surface roughness are of great importance in applications involving information recording (videotapes etc.). These properties of polymers processed with such film production techniques as tenter frame operations are not well understood. To understand the relationships between…
A Heterocyclic Polymer with Thermally Stable Second-Order Optical Nonlinearity
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Heterocyclic Polymer with Thermally Stable Second-Order Optical NonlinearityZhiyong Liang, Larry R. Dalton, Sean M. Garner, Srinath Kalluri, Antao Chen, and William H. SteierCite this: Chem. Mater. 1995, 7, 10, 1756–1758Publication Date (Print):October 1, 1995Publication H…