Abstract
The perovskite polymorph of YbMnO3 has been revisited. The orthorhombic phase is obtained through a high-pressure (HP) reconstructive transformation from the hexagonal sol−gel-synthesized YbMnO3 by means of HP annealing at 5 GPa and 1100 °C. Neutron powder diffraction shows that the HP form crystallizes in the orthorhombic space group Pbnm. At 298 K, the refined values for lattice parameters a, b, and c are respectively 5.2208(3), 5.8033(3), and 7.3053(4) A. The average Mn−O−Mn angle is 141.9°, indicative of a strong tilting of the MnO6 octahedra. Magnetic susceptibility measurements indicate antiferromagnetic order of Mn3+ spins at TN = 43 K and of Yb3+ spins at 4 K. The magnetic structure is commensurate Ay with an ordered moment 3.45(5) μB at 9 K. The magnetic susceptibility obeys the Curie−Weiss law, χ = C/(T − θ), in two temperature regions, that is, above 240 K and 6−30 K. The obtained effective paramagnetic moments μeff are 6.37 μB and 4.83 μB for the two temperature ranges, respectively. The forme...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
