Uniform chemical pressure effect in solid solutions Ba1-xSrxFe2As2 and Sr1−xCaxFe2As2

The effect of alkaline earth substitution on structural parameters was studied in high-quality single crystals of Ba1−xSrxFe2As2 and Sr1−xCaxFe2As2 grown by the self-flux method. The results of single-crystal and powder x-ray diffraction measurements suggest a continuous monotonic decrease of both a...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.273 (1), p.012104
Main Authors: Saha, S R, Kirshenbaum, K, Butch, N P, Paglione, J, Zavalij, P Y
Format: Article
Language:English
Subjects:
Atomic radius
Crystal structure
Crystals
Lattice parameters
Phase diagrams
Physics
Pressure effects
Single crystals
Solid solutions
Unit cell
X ray powder diffraction
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Summary:The effect of alkaline earth substitution on structural parameters was studied in high-quality single crystals of Ba1−xSrxFe2As2 and Sr1−xCaxFe2As2 grown by the self-flux method. The results of single-crystal and powder x-ray diffraction measurements suggest a continuous monotonic decrease of both a- and c-axis lattice parameters, the c/a tetragonal ratio, and the unit cell volume with decreasing alkaline earth atomic radius as expected by Vegard's law. As a result, the system experiences a continuously increasing chemical pressure effect in traversing the phase diagram from x 0 in Ba1−xSrxFe2As2 to x 1 in Sr1−xCaxFe2As2.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/273/1/012104