Crystal Growth and Structural Investigation of A₂BReO₆ (A=Sr, Ba; B=Li, Na)

Author(s)

Muktha Bharathy, University of South Carolina - Columbia
Hans-Conrad zur Loye, University of South Carolina - ColumbiaFollow

Document Type

Paper

Subject Area(s)

Chemistry

Abstract

Single crystals of the double perovskite rhenates A₂BReO₆ (A=Sr, Ba; B=Li, Na) were grown out of molten hydroxide fluxes. Single crystals of orange/yellow Ba₂LiReO₆, Ba₂NaReO₆ and Sr₂LiReO₆ were solved in the cubic, Fm-3m space group with a=8.1214(11) Å, 8.2975(3) Å, and 7.9071(15) Å, respectively, while Sr₂NaReO₆ was determined to be monoclinic P21/n with a=5.6737(6) Å, b=5.7988(6) Å, c=8.0431(8) Å, and β=90.02(6) °. The cubic structure consists of a rock salt lattice of corner-shared ReO₆ and MO₆ (M=Li, Na) octahedra which, in the monoclinic structure, are both tilted and rotated. A discrepancy exists between the symmetry of Sr₂LiReO₆ indicated by the single-crystal refinement of flux-grown crystals (cubic, Fm-3m) and the symmetry indicated by the powder diffraction data collected on polycrystalline samples prepared by the ceramic method (tetragonal, I4/m). It is possible that the cubic crystals are a kinetic product that forms in small quantities at low temperatures, while the powder represents the more stable polymorph that forms at higher reaction temperature.

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.jssc.2008.06.056

Publication Info

Published in Journal of Solid State Chemistry, Volume 181, Issue 10, 2008, pages 2789-2795.

Rights

© Journal of Solid State Chemistry 2008, Elsevier.

APA Citation

Bharathy, M., & zur Loye, H.-C. (2008). Crystal Growth and Structural Investigation of A₂BReO₆ (A=Sr, Ba; B=Li, Na). Journal of Solid State Chemistry, 181(10), 2789–2795. https://doi.org/10.1016/j.jssc.2008.06.056