Structures and stabilities of trivalent and tetravalent rare earth ions in sevenfold and eightfold coordination in fluorite-related complex oxides [electronic resource]
This paper reports the preparation and characterization of a series of oxides containing 3+ or 4+ lanthanide (M = Ce, Pr, or Tb) ions, with different ionic sizes and varying M{sup 4+}/M{sup 3+} reduction potentials, in nearly cubic coordination. The objective of the study was to demonstrate how oxid...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Defense ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1991.
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| Subjects: |
MARC
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| 086 | 0 | |a E 1.99: conf-911109--6 | |
| 086 | 0 | |a E 1.99:anl/cp-73404 | |
| 086 | 0 | |a E 1.99: conf-911109--6 | |
| 245 | 0 | 0 | |a Structures and stabilities of trivalent and tetravalent rare earth ions in sevenfold and eightfold coordination in fluorite-related complex oxides |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. Dept. of Defense ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, |c 1991. | ||
| 300 | |a Pages: (8 p) : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
| 337 | |a computer |b c |2 rdamedia. | ||
| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through the Information Bridge: DOE Scientific and Technical Information. | ||
| 500 | |a 01/01/1991. | ||
| 500 | |a "anl/cp-73404" | ||
| 500 | |a " conf-911109--6" | ||
| 500 | |a "DE92005237" | ||
| 500 | |a Fall meeting of the European Materials Research Society, Strasbourg (France), 5-8 Nov 1991. | ||
| 500 | |a Morss, L.R. | ||
| 520 | 3 | |a This paper reports the preparation and characterization of a series of oxides containing 3+ or 4+ lanthanide (M = Ce, Pr, or Tb) ions, with different ionic sizes and varying M{sup 4+}/M{sup 3+} reduction potentials, in nearly cubic coordination. The objective of the study was to demonstrate how oxidation-reduction characteristics and ionic size trends explain the properties of these oxides and to compare the oxidation-reduction stability of M{sup 3+} and M{sup 4+} lanthanide ions in high (CN 7 or 8) coordination in fluorite-related oxides versus low (CN 6) coordination in perovskite oxides. Efficient preparative methods are reported, as well as powder diffraction and thermogravimetric measurements for oxides CaMTi₂O{sub 7-x} and CaMZr₂O{sub 7-x}. These oxides were characterized by X-ray powder diffraction and by thermogravimetric analysis. CaCeTi₂O₇ is a pyrochlore, a = 10.142(4) Å, with Ce{sup 4+} much more easily reducible than in the perovskite BaCeO₃. By contrast, a preparation with the stoichiometry CaPbTi₂O{sub 7-x}'' is a two-phase mixture-of perovskite CaTiCo₃ and a presumably Pr{sup 3+}-rich pyrochlore Pr₂Ti₂O₇( ). CaTbTi₂O{sub 7-x} appears to be a Tb{sup 3+} pyrochlore, a = 10.149(2) Å. CaCeZr₂O₇ is a pyrochlore, a = 10.524(1) Å. A preparation of CaPbZr₂O{sub 7-x}'' also appeared to yield a two-phase mixture, perovskite CaZrO₃ and pyrochlore Pr₂Zr₂O₇. In this paper, the structures, f-element ion sites, and M(4)-M(3) stability trends in the CaMTi₂O{sub 7-x} and CaMZr₂O{sub 7-x} oxides are compared with the structural and stability trends in the perovskites BaMO₃ which have M{sup 4+} ions in sixfold (tilted octahedra) coordination. | |
| 536 | |b W-31109-ENG-38. | ||
| 650 | 7 | |a X-ray Diffraction. |2 local. | |
| 650 | 7 | |a Praseodymium Compounds. |2 local. | |
| 650 | 7 | |a Scattering. |2 local. | |
| 650 | 7 | |a Oxide Minerals. |2 local. | |
| 650 | 7 | |a Quantitative Chemical Analysis. |2 local. | |
| 650 | 7 | |a Transition Element Compounds. |2 local. | |
| 650 | 7 | |a Oxygen Compounds. |2 local. | |
| 650 | 7 | |a Cerium Oxides. |2 local. | |
| 650 | 7 | |a Minerals. |2 local. | |
| 650 | 7 | |a Cerium Compounds. |2 local. | |
| 650 | 7 | |a Lattice Parameters. |2 local. | |
| 650 | 7 | |a Terbium Oxides. |2 local. | |
| 650 | 7 | |a Diffraction. |2 local. | |
| 650 | 7 | |a Thermal Analysis. |2 local. | |
| 650 | 7 | |a Thermal Gravimetric Analysis. |2 local. | |
| 650 | 7 | |a Coherent Scattering. |2 local. | |
| 650 | 7 | |a Rare Earth Compounds. |2 local. | |
| 650 | 7 | |a Chemical Analysis. |2 local. | |
| 650 | 7 | |a Chemical Reactions. |2 local. | |
| 650 | 7 | |a Gravimetric Analysis. |2 local. | |
| 650 | 7 | |a Terbium Compounds. |2 local. | |
| 650 | 7 | |a Oxides. |2 local. | |
| 650 | 7 | |a Praseodymium Oxides. |2 local. | |
| 650 | 7 | |a Redox Reactions. |2 local. | |
| 650 | 7 | |a Chalcogenides. |2 local. | |
| 650 | 7 | |a Inorganic, Organic, Physical And Analytical Chemistry. |2 edbsc. | |
| 710 | 2 | |a Argonne National Laboratory. |4 res. | |
| 710 | 1 | |a United States. |b Department of Defense. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
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