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Author Tabira, Yasunori ♦ Withers, R. ♦ Thompson, J. ♦ Schmid, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CRYSTAL STRUCTURE ♦ LANTHANUM OXIDES ♦ ZIRCONIUM OXIDES ♦ X-RAY DIFFRACTION ♦ ELECTRON DIFFRACTION ♦ STOICHIOMETRY ♦ PYROCHLORE ♦ SOLID SOLUTIONS ♦ ATOMIC DISPLACEMENTS
Abstract A detailed electron and X-ray powder diffraction study has been made of the compositional and displacive flexibility of the rare earth zirconate pyrochlore (1 {minus} {delta})ZrO{sub 2}{center_dot}{delta}LaO{sub 1.5} = (La{sup 3+}){sub {delta}}(Zr{sup 4+}){sub 1{minus}{delta}}O{sub 2{minus}{delta}/2}, {delta} {approximately} 0.5. The extent of the pyrochlore solid solution in specimens rapidly quenched from 1500 C is shown to be considerably narrower than previously reported and certainly less than 2 mol.% in width. A weak but highly structured and quite reproducible diffuse intensity distribution in the form of {l_brace}110{r_brace}{sup *} polarized sheets of diffuse intensity perpendicular to each of the six <110> real space directions is observed in electron diffraction patterns and interpreted in terms of {beta}-cristobalite-like <110> tetrahedral edge rotation of essentially rigid O(2)(La){sub 4} tetrahedra.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-02-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 142
Issue Number 2


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