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Synthesis and Crystallochemical Characterization of the Bi3RE5O12-Type Phases

✍ Scribed by R. Horyń; M. Wołcyrz; A. Wojakowski

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
155 KB
Volume
116
Category
Article
ISSN
0022-4596

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✦ Synopsis

A series of (\mathrm{Bi}{3}^{+}{ }^{3} R E{5} \mathrm{O}{12})-type phases ( (R E=\mathrm{Y}, \mathrm{La}, \mathrm{Pr}, \mathrm{Nd}, \mathrm{Sm}), (\mathrm{Eu}, \mathrm{Gd}, \mathrm{Tb}, \mathrm{Dy}, \mathrm{Ho}, \mathrm{Er}, \mathrm{Yb}, \mathrm{Lu})) has been prepared in air at (950^{\circ} \mathrm{C}) and characterized by (\mathrm{X})-ray powder diffraction and density and valence measurements performed on single-phase samples. With the exception of the (\mathrm{Er}, \mathrm{Yb}), and Lu varieties, the characteristic feature of the series is rhombohedral symmetry. The lattice parameters of the individual phases depend on the (R E) element and are within the intervals (a=3.755-3.959 \AA) and (c=9.482-9.964 \AA) (hexagonal setting). Traces of very weak superstructure peaks indicate a possible unit cell multiplication. The series is stable in air and exhibits a comparatively wide compositional interval centered around the (\mathrm{Bi}{3} R E_{5} \mathrm{O}_{12}) stoichiometry. (1995 Academic Press, Inc.

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