TITLE

Atomic displacement parameters and structural disorder of oxygen ions in the CexZr1-xO2 solid solutions (0.12≤x≤1.0): Possible factors of high catalytic activity of ceria-zirconia catalysts

AUTHOR(S)
Yashima, Masatomo; Wakita, Takahiro
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p171902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Crystal structures and electron-density distributions of ceria-zirconia CexZr1-xO2 compounds have been studied by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using high-angular-resolution synchrotron x-ray powder diffraction data. The isotropic atomic displacement parameter of the oxygen atoms U(O) in Ce0.5Zr0.5O2 has a maximum value in CexZr1-xO2 (0.12≤x≤1.0). Electron-density distribution of Ce0.5Zr0.5O2 shows a large spatial distribution of the oxygen ions. The greater U(O) and large spatial distribution of oxygen ions in Ce0.5Zr0.5O2 are possible factors of its higher catalytic activity.
ACCESSION #
38712366

 

Related Articles

  • Radiation Damage of Cerium Doped Lanthanum Bromide Crystal. ZHENGGUO LI; DAN LIU; YANGUO DING; HONGSHENG SHI; LAISHUN QIN; KANGYING SHU // Asian Journal of Chemistry;2014, Vol. 26 Issue 14, p4439 

    In this paper, the radiation damage of the LaBr3: Ce crystals with different cerium doped concentration are investigated. One is the LaBr3: 3 % Ce crystal. The sizes of this crystal reach to 11 mm x 11 mm x 13 mm. One is the LaBr3: 5% Ce crystal. This crystal is a cylindrical crystal with sizes...

  • Estimating implied correlations for currency basket options using the maximum entropy method. Krishnan, Hari; Nelken, Izzy // Derivatives Use, Trading & Regulation;2001, Vol. 7 Issue 3, p275 

    Presents a study which used the maximum entropy method to estimate the implied correlations between different currency pairs. Suggestions on how trading opportunities can be identified using the method; Discussion on the financial applications of the maximum entropy method.

  • Maximum entropy formalism and analytic extrapolation. Antolín, J. // Journal of Mathematical Physics;Apr90, Vol. 31 Issue 4, p791 

    The maximum entropy principle is used to obtain a new analytic extrapolation method just complementary to the Padé-type method which leads to rigorous upper and lower bounds on the extrapolated function on the cut complex plane. Among the large class of functions that could equally well...

  • A thermodynamical approach to Eddington factors. Anile, A. M.; Pennisi, S.; Sammartino, M. // Journal of Mathematical Physics;Feb91, Vol. 32 Issue 2, p544 

    Eddington factors are a common ingredient in many techniques for solving radiation hydrodynamics problems. Usually they are introduced in a phenomenological or ad hoc manner. In this paper a fundamental approach is devised for justifying Eddington factors on the basis of mathematical...

  • Remarks on the information entropy maximization method and extended thermodynamics. Byung Chan Eu // Journal of Chemical Physics;4/8/1998, Vol. 108 Issue 14, p5834 

    Investigates the extension of thermodynamics in the information entropy maximization method. Derivation of evolution equations from the Liouville equation; Provision of a basis for extended thermodynamics through the method; Relationship between nonequilibrium statistical mechanics and...

  • Application of the Principle of Maximum Entropy Production to the Analysis of the Morphological Stability of a Growing Crystal. Martiouchev, L. M.; Seleznev, V. D.; Kuznetsova, I. E. // Journal of Experimental & Theoretical Physics;Jul2000, Vol. 91 Issue 1, p132 

    The morphological stability of spherical and cylindrical crystals and an infinite plane growing from a supersaturated solution is studied using the principle of maximum entropy production in the Mullins and Sekerka approximation. In contrast to the first two geometries, the computational results...

  • Symmetric Positive Equilibrium Problem: A Framework for Rationalizing Economic Behavior with Limited Information. Paris, Quirino // American Journal of Agricultural Economics;Nov2001, Vol. 83 Issue 4, p1049 

    The PMP methodology is extended to deal with many economic units, self-selection arising from heterogeneous economic behavior, and multiple limiting inputs. The novel structure for the analysis of this type of problems acquires the name "symmetric positive equilibrium problem." This methodology...

  • Size-distribution in sudden breakage by the use of entropy maximization. Englman, R.; Rivier, N.; Jaeger, Z. // Journal of Applied Physics;5/1/1988, Vol. 63 Issue 9, p4766 

    Presents information on a study which derived the number and weight distributions of fragment pieces that are obtained in a sudden fragmentation process. Use of maximum entropy for fragment-size distributions; Discussion on the alternative approach based on the maximum entropy method; Weight...

  • Approximate solution of Fredholm integral equations by the maximum-entropy method. Mead, Lawrence R. // Journal of Mathematical Physics;Dec86, Vol. 27 Issue 12, p2903 

    An approximate means of solving Fredholm integral equations by the maximum-entropy method is developed. The Fredholm integral equation is converted to a generalized moment problem whose approximate solution by maximum-entropy methods has been successfully implemented in a previous paper by Mead...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics