Synchrotron X-ray diffraction study of double perovskites Sr2RNbO6 ( R = Sm, Gd, Dy, Ho, Y, Tm, and Lu)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Illinois Inst. of Technology, Chicago, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
A series of double-perovskite oxides, Sr2RNbO6(R= Sm, Gd, Dy, Ho, Y, Tm, and Lu) were prepared and their crystal structure and powder diffraction reference patterns were determined using the Rietveld analysis technique. The crystal structure of each of the Sr2RNbO6phase is reported in this paper. TheR= Gd, Ho, and Lu samples were studied using synchrotron radiation, whileR= Sm, Dy, Y, and Tm samples were studied using laboratory X-ray diffraction. Members of Sr2RNbO6are monoclinic with a space group ofP21/nand are isostructural with each other. Following the trend of “lanthanide contraction”, fromR= Sm to Lu, the lattice parameters “a” of these compounds decreases from 5.84672(10) to 5.78100(3) Å,bfrom 5.93192(13) to 5.80977(3) Å,cfrom 8.3142(2) to 8.18957(5) Å, andVdecreases from 288.355(11) to 275.057(2) Å3. In this double-perovskite series, theR3+and Nb5+ions are structurally ordered. The average Nb–O bond length is nearly constant, while the averageR–O bond length decreases with the decreasing ionic radius ofR3+. Powder diffraction patterns for these compounds have been submitted to the Powder Diffraction File (PDF).
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1503241
- Journal Information:
- Powder Diffraction, Vol. 33, Issue 4; ISSN 0885-7156
- Publisher:
- Cambridge University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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