Materials Literature
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Oxidation of chemically vapor‐deposited Si 3 N 4 was studied in dry oxygen between 1923 and 2003 K under a total pressure of 0.1 MPa using a thermogravimetric technique. At 1923 to 1953 K, a parabolic rate mechanism prevailed for the oxidation reaction. From 1973 K, the oxidation reaction exhibited a mixed linear‐para…
SUMMARY In this paper it is shown that CO2 can effectively displace oil from diatomite under countercurrent conditions. A simple model is presented which quantitatively matches the observed oil production. CO2 is postulated to contact the oil due primarily to diffusive transport, and the diffusion coefficient used is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of molecules onto microporous hematiteTatsuo Ishikawa, Wei Yan Cai, and Kazuhiko KandoriCite this: Langmuir 1993, 9, 4, 1125–1128Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of a cofacial dirhodium diporphyrin: synthesis and reactivity of Rh2DPBJames P. Collman, Yunkyoung Ha, Roger Guilard, and Michel Angel LopezCite this: Inorg. Chem. 1993, 32, 9, 1788–1794Publication Date (Print):April 1, 1993Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReevaluating structures for mixed crystals of simple isomorphous salts: sodium chlorate bromate (NaClxBr1-xO3)Prakash Gopalan, Matthew L. Peterson, Guy Crundwell, and Bart KahrCite this: J. Am. Chem. Soc. 1993, 115, 8, 3366–3367Publication Date (Print):April 1, 1993Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron beam irradiation of polyperfluoroethers: experimental analysis of main-chain degradationJ. Pacansky and R. J. WaltmanCite this: Chem. Mater. 1993, 5, 4, 486–494Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 Ap…
The normal modes of vibration and their frequencies are calculated for benitoite, a mineral whose crystal structure (space group ${\mathit{D}}_{3\mathit{h}}^{2}$) consists of three-membered silicate rings (${\mathrm{Si}}_{3}$${\mathrm{O}}_{9}$) linked by ${\mathrm{Ba}}^{2+}$ and ${\mathrm{Ti}}^{4+}$ ions. Factor-group…
Amorphous lithium electrolyte thin films, xLi 2 O·ySiO 2 ·zP 2 O 5 , were deposited by rf magnetron sputtering of pure and mixed‐phase lithium silicate, lithium phosphate, SiO 2 , Li 2 O, and Li 2 CO 3 targets, and their compositions were determined using proton‐induced y ‐ray emission spectroscopy, energy‐dispersive…
Quasicrystals and related phases were grown to study their morphology and to try to gain sonie insight into their growth mechanism. Using different characteriz-ation techniques a relationship between morphology, composition and structure of the quasicrystals and related phases is established. This relationship is qual…
The charge storage properties of corona-charged biaxially oriented polypropylene (BOPP) and unoriented polypropylene (PP) films have been studied. Thermally stimulated charge decay and open and short circuit thermally stimulated currents, were measured. A half-value charge decay temperature for BOPP was T/sub 0.4/=118…
X-ray photoemission measurements of high purity CuCl2 are presented. XPS studies of Cu compounds in this laboratory have been motivated by the need to identify species on chemically etched high temperature superconductor surfaces [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (1989)].
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl ether ketone) (PAEK) block and chain-extended copolymers. 2. Preparation and characterization of chain-extended PAEK copolymers and poly(ether ketone ketone)/poly(ether ether ketone) block copolymersJ. E. Harris, P. A. Winslow, J. H. Botkin, L. M. Maresca, R. A. Cl…
Single-crystal X-ray diffraction (Mo Kalpha radiation, lambda = 0.71073 angstrom) was used to determine the structure Of the commensurate inorganic misfit-layer compound (BiSe)alpha0TaSe2, alpha0 = 12/11 congruent-to 1.09. The structure is described as a (3 + 1)-dimensional intergrowth compound with two subsystems and…
The effective dielectric response ${\mathrm{\ensuremath{\epsilon}}}_{\mathit{M}}$ of a composite with aligned spherodial inclusions is calculated. Using the dipolar and the mean-field approximation (MFA) an analytical expression for ${\mathrm{\ensuremath{\epsilon}}}_{\mathit{M}}$ as a functional of the two-particle di…
Abstract Es wurde der Einfluß der Substitution von Ag + durch Na + auf die Kristallstruktur und die Ionenleitfähigkeit von Ag 3 YCl 6 (aufgefüllter LiSbF 6 ‐Typ) untersucht. Das System Ag 3−x Na x YCl 6 zeigt vollständige Mischkristallbildung. Der aufgefüllte LiSbF 6 ‐Typ tritt über den gesamten Bereich auf. Erst bei…
X-ray photoemission measurements of high purity CuBr are presented. XPS studies of Cu compounds in this laboratory have been motivated by the need to identify species on chemically-etched high temperature superconductor surfaces [see R. P. Vasquez, M. C. Foote, and B. D. Hunt, J. Appl. Phys. 66, 4866 (1989)].
Measurement models have been applied to electrochemical impedance data collected at the corrosion potential for a copper disk rotating in alkaline- and acid-aerated 0.5 M chloride solutions. Several applications of measurement models for the interpretation of experimental impedance data are demonstrated. Corrosion is…
Coherent neutron-scattering experiments on liquid cesium and rubidium near the melting point reveal an anomalous dispersion of collective modes for frequencies \ensuremath{\omega}${\mathrm{\ensuremath{\tau}}}_{\mathit{M}}$\ensuremath{\gg}1 with ${\mathrm{\ensuremath{\tau}}}_{\mathit{M}}$ the Maxwell relaxation time fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of the first .alpha.-linked quaterpyrroleHidetsugu Ikeda and Jonathan L. SesslerCite this: J. Org. Chem. 1993, 58, 8, 2340–2342Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi…
Abstract Comparing the state of reaction advancement of I/S (illite content of illite/smectite mixed layer minerals) and organic matter (vitrinite reflectance) in instances of high temperature gradients allows one to observe the evolution of geologic materials under extreme conditions. In a geothermally heated sedimen…