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X-ray diffraction study and powder patterns of double-perovskites Sr2RSbO6 (R = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, Tm, Yb, and Lu)

Published online by Cambridge University Press:  15 September 2014

W. Wong-Ng*
Affiliation:
Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
J. A. Kaduk
Affiliation:
BCPS Chemistry Department, Illinois Institute of Technology, Chicago, Illinois 60616
M. Luong
Affiliation:
Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
Q. Huang
Affiliation:
NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
*
a) Author to whom correspondence should be addressed. Electronic mail: [email protected]

Abstract

The X-ray diffraction powder patterns were prepared and the crystal structures were refined for the double-perovskite series of compounds, Sr2RSbO6 (R = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, Tm, Yb, and Lu). We found the structures of the entire Sr2RSbO6 series to be monoclinic with space group P21/n (no. 14), and Z = 2. From R = Lu to Pr, the lattice parameters “a” range from 5.7779(2) to 5.879 05(8) Å, “b” range from 5.7888(2) to 5.969 52(9) Å, “c” range from 8.1767(3) to 8.369 20(12) Å, “β” range from 90.112(2)° to 90.313(1)°, and “V” range from 273.483(4) to 293.714(7) Å3. These lattice parameters follow the well-established trend of “lanthanide contraction”. The R 3+ and Sb5+ ions are found to be fully ordered in the double-perovskite arrangement of alternating corner-sharing octahedra in a zigzag fashion. The SrO12, RO6, and SbO6 cages are all found to have distorted coordination environments. Powder diffraction patterns of these compounds have been prepared, submitted, and published in the Powder Diffraction File.

Type
Technical Articles
Copyright
Copyright © International Centre for Diffraction Data 2014 

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