AI Article Synopsis
- - The perovskite form of Mn(2)CrSbO(6) was created under high pressure and temperature conditions, showing a monoclinic crystal structure with specific dimensions.
- - Below 55 K, both Mn(2+) and Cr(3+) ions exhibit simultaneous antiferromagnetic ordering, with unique spin arrangements observed via low temperature neutron diffraction.
- - Thermal processing of the compound leads to a transition to the ilmenite form, which displays an incommensurate magnetic structure and a varying spin propagation vector below 60 K.
Article Abstract
The perovskite polymorph of Mn(2)CrSbO(6) compound has been synthesized at 8 GPa and 1473 K. It crystallizes in the monoclinic P21/n space group with cell parameters a = 5.2180 (2) Å, b = 5.3710(2) Å, c = 7.5874(1) Å and β = 90.36(1)°. Magnetic susceptibility and magnetization measurements show the simultaneous antiferromagnetic ordering of Mn(2+) and Cr(3+) sublattices below TN = 55 K with a small canting. Low temperature powder neutron diffraction reveals a commensurate magnetic structure with spins confined to the ac-plane and a propagation vector κ = [1/2 0 1/2]. The thermal treatment of this compound induces an irreversible phase transition to the ilmenite polymorph, which has been isolated at 973 K and crystallizes in R3[combining macron] space group with cell parameters a = 5.2084 (4) Å and c = 14.4000 (11) Å. Magnetic susceptibility, magnetization and powder neutron diffraction data confirm the antiferromagnetic helical ordering of spins in an incommensurate magnetic structure with κ = [00 0.46] below 60 K, and the temperature dependence of the propagation vector up to κ = [00 0.54] at about 10 K.
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| http://dx.doi.org/10.1039/c4dt03849e | DOI Listing |
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