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We have made a systematic theoretical survey of the competition between ferroelastic and ferroelectric instabilities in the family of halide-based perovskites of formula ${\mathrm{ABX}}_{3}$, where A is an alkali-metal ion, B is a Be, Mg, or Ca ion, and X is a halide ion. Initially we surveyed the whole series of such…
Abstract Atomic ratio determinations in a series of pure inorganic compounds have been derived from XPS peak intensity measurements taken by area via the so‐called ‘first principles model’ (FPM) and the ‘elemental sensitivity factors’ (ESF) methods. The two methods show similar degrees of accuracy, with a typical erro…
Steps corresponding to (110), (211), (310), (222), and (321) facets in monocrystals of blue phase I (BP I) are described. We show that close to equilibrium, surfaces of BP I monocrystals contain facets and rounded parts on which a series of steps can be distinguished. During growth, the round parts are eliminated and…
Optical studies of LiKSO4 crystals were performed in polarized 11yh.t within the temperature range from 300 up to 1000 K. The observations confirmed the existence of two phase transitions at about 700 and 940 K respectively. The high-temperature phase between 700 and 940 K was found to be ferroelastic.
In a brief study of the feasibility of welding sintered a‐Sic, solid‐state welding and brazing were investigated. Joint quality was determined solely by microstructural examination. Hot‐pressure welding was shown to be feasible at 1950°C. Diffusion welding and brazing were also successful under hot isostatic pressure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic model of the selective catalytic reduction of nitric oxide with ammoniaRonald J. Willey, John W. Eldridge, and J. R. KittrellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 2, 226–233Publication Date (Print):June 1, 1985Publication History Published online1…
Abstract The converter warmup model developed previously (Oh and Cavendish, 1985) has been used to simulate the performance of a packed‐bed converter during the cold‐start portion of vehicle emissions tests. Despite the highly transient converter inlet conditions, the model successfully predicts tailpipe mass emission…
A new measurement system for determination of real and imaginary material coefficients of piezoelectric ceramics is presented.The method of calculation, the hardware, the software and the accuracy are discussed, and measurements of SE11, d31, εT33, SD33, g33, βT33, CD33, h33, βS33 of a piezoelectric ceramic, with the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical and electronic spin state tuning of the metal center in the nickel(II) tropocoronandsWilliam M. Davis, Michael M. Roberts, Arie Zask, Koji Nakanishi, Tetsuo Nozoe, and Stephen J. LippardCite this: J. Am. Chem. Soc. 1985, 107, 13, 3864–3870Publication Date (Pri…
Electrochemical corrosion rates of Cu and Cu-Ni alloys have been measured in oxygenated 0.5M NaCl and in synthetic seawater using the Tafel extrapolation procedure. In addition, Cu corrosion has been measured with the linear polarization procedure. A rotating disk electrode system was used in the measurements with rot…
The integrated Raman band intensities for internal vibrational modes of various adsorbates at roughened silver electrodes are combined with surface concentrations obtained electrochemically to yield surface Raman scattering cross sections. These data together with the corresponding bulk-phase Raman intensities provide…
Polytellurophene is prepared chemically using FeCl 3 as catalyst at the first time. The electrical conductivity in the doped state is found to be relatively low, 10 -6 S/cm, compared with that in polythiophene. Polyselenophene films prepared by a chemical method are found to indicate similar characteristics with those…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of metal-metal bonding in early-transition-metal dioxidesJeremy K. Burdett and Timothy HughbanksCite this: Inorg. Chem. 1985, 24, 12, 1741–1750Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1 June 1985https://pubs…
Abstract A transient mathematical model has been developed which describes the behavior of packed‐bed catalytic converters during warmup. Model predictions agree very well with the results of engine‐dynamometer experiments for three Pt‐alumina catalysts of widely different properties, thus demonstrating the validity o…
The transient temperature field (as seen by a moving observer) due to a moving heat source, such as the process zone near a dynamically propagating crack tip or an external agent as in the case of welding, is analyzed by a moving-mesh finite element procedure. The effects of the temperature-dependent material properti…
Of several methanogenic bacteria examined only Methanococcus voltae readily incorporated exogenous amino acids into cell protein. This was easily shown, since growth in the presence of exogenous amino acids resulted in a loss of signal intensities from those carbon atoms normally labelled by [13C]acetate during biosyn…
Atomic charges are derived from two dissimilar methods of partitioning the electron density of diatomic molecules. The results given by both methods are similar, with the exception of those for molecules containing lithium; factors responsible for this discrepancy are explored. The charges derived are correlated close…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structures, and physical properties of two products from the iodination of (phthalocyaninato)iron(II)Sharon M. Palmer, Judith L. Stanton, Narendra K. Jaggi, Brian M. Hoffman, James A. Ibers, and Lyle H. SchwartzCite this: Inorg. Chem. 1985, 24, 13, 2040–2046Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA test of superconductivity vs. molecular disorder in (BEDT-TTF)2X synthetic metals: synthesis, structure (298, 120 K), and microwave/ESR conductivity of (BEDT-TTF)2I2BrThomas J. Emge, Hau H. Wang, Mark A. Beno, Peter C. W. Leung, Millicent A. Firestone, Harvey C. Jenkins, J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of an iron(IV)-oxo "picket-fence" porphyrin derivative via reduction of the ferrous dioxygen adduct and reaction with carbon dioxideM. Schappacher, R. Weiss, R. Montiel-Montoya, A. Trautwein, and A. TabardCite this: J. Am. Chem. Soc. 1985, 107, 12, 3736–3738Publica…