Abstract
We report a detailed study of structural and magnetic properties of the pyrochlore-type (Bi 2− x Pr x )Ru 2O 7 series. Eleven compositions with 0 ≤ x ≤ 2 were prepared by solid-state reaction at 1050 °C and found to form a solid solution in the whole range of compositions. Structural refinements from X-ray powder diffraction data by the Rietveld method show that the main variation concerns the ruthenium site. Ru–O distances increase and the Ru–O–Ru angle (bridging corner-sharing Ru–O octahedra) decreases with increasing praseodymium content, in agreement with the metal–semiconductor transition observed previously in this system. Magnetic measurements show that the metallic Pauli paramagnetism of Ru in Bi 2Ru 2O 7 evolves to a magnetism of localized low spin moments coexisting with the magnetism of Pr 3+ cations moments. Strong magnetic correlations are present at high Pr content, as illustrated by a Néel temperature of −224 K for Pr 2Ru 2O 7. However no evidence of a magnetic ordering was found, suggesting that the end compound Pr 2Ru 2O 7 of the series might stabilize a spin liquid phase.
Sign-in/Register to access full text options 
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.
