Evolution of the crystal structure and magnetic properties of Sr2-xCaxCrSbO6 with composition

Evolution of the crystal structure and magnetic properties of Sr2-xCaxCrSbO6 with composition Polycrystalline samples of compositions in the perovskite solid solution Sr2-xCaxCrSbO6 (x = 0, 0.25. 0.5, 0.75, 1.0, 1.25, 1.50, 1.75, 2.0) were synthesised and characterised by synchrotron x-ray diffraction and SQUID magnetometry. Neutron powder diffraction data were collected on the x = 0, 0.25, 0.5, 1.0, 1.5 and 2.0 compositions. It was found that Sr2CrSbO6 crystallised in the triclinic I1̅ space group. The other compositions were all found to crystallise in the monoclinic space group P21/n although Sr1.5Ca0.5CrSbO6 was found to be phase separated into a calcium-deficient and calcium-rich phase, both having the space group P21/n. Sr2CrSbO6 was found to order antiferromagnetically at 12 K and the ordered Cr3+ moment was refined to be 2.39(1) µB. The antiferromagnetic order was rapidly quenched on doping with Ca and compositions with x ≥ 0.75 exhibited ferromagnetic order. TC increased with x to reach a maximum of 14 K at x = 2.0, with an ordered moment of 2.56(3) µB per Cr3+ cation. The tilt angles of the B-site octahedra about [110] and [001] increase from 5.4(1)° and 4.6(1)° to 13.7(1)° and 13.9(1)°, respectively, across the series; the switch from antiferromagnetism to ferromagnetism occurs when both tilts are at a value of ~ 8°. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Solid State Chemistry Elsevier

Evolution of the crystal structure and magnetic properties of Sr2-xCaxCrSbO6 with composition

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Inc.
ISSN
0022-4596
eISSN
1095-726X
D.O.I.
10.1016/j.jssc.2018.04.037
Publisher site
See Article on Publisher Site

Abstract

Polycrystalline samples of compositions in the perovskite solid solution Sr2-xCaxCrSbO6 (x = 0, 0.25. 0.5, 0.75, 1.0, 1.25, 1.50, 1.75, 2.0) were synthesised and characterised by synchrotron x-ray diffraction and SQUID magnetometry. Neutron powder diffraction data were collected on the x = 0, 0.25, 0.5, 1.0, 1.5 and 2.0 compositions. It was found that Sr2CrSbO6 crystallised in the triclinic I1̅ space group. The other compositions were all found to crystallise in the monoclinic space group P21/n although Sr1.5Ca0.5CrSbO6 was found to be phase separated into a calcium-deficient and calcium-rich phase, both having the space group P21/n. Sr2CrSbO6 was found to order antiferromagnetically at 12 K and the ordered Cr3+ moment was refined to be 2.39(1) µB. The antiferromagnetic order was rapidly quenched on doping with Ca and compositions with x ≥ 0.75 exhibited ferromagnetic order. TC increased with x to reach a maximum of 14 K at x = 2.0, with an ordered moment of 2.56(3) µB per Cr3+ cation. The tilt angles of the B-site octahedra about [110] and [001] increase from 5.4(1)° and 4.6(1)° to 13.7(1)° and 13.9(1)°, respectively, across the series; the switch from antiferromagnetism to ferromagnetism occurs when both tilts are at a value of ~ 8°.

Journal

Journal of Solid State ChemistryElsevier

Published: Aug 1, 2018

References

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