Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO3-xKMgF3

Recently, a series of oxyfluorides, Sr1−xBaxFeO2F with x = 0, 0.25, 0.50, and 0.75 obtained through a novel synthesis route, were characterized by X-ray and neutron powder diffraction (NPD), magnetization measurements, and 57Fe Mössbauer spectroscopy (MS). The diffraction data revealed random occupancy of Sr and Ba atoms at the A-cation site, and a statistical distribution of O and F at the anionic sublattice of the perovskite-like structure specified in space group Pm-3m. MS spectra analysis consistently indicated the presence of Fe3+ ions at B-site, confirming the Sr1−xBaxFeO2F stoichiometry. Magnetic structure determination from the NPD data at room temperature established G-type antiferromagnetic arrangement in all compositions with Fe3+ moments of about 3.5 μB oriented along the c axis. In this study, we present and analyze additional NPD data concerning the low-temperature chemical and magnetic structure of Sr0.5Ba0.5FeO2F (x = 0.5) and SrFeO2F (x = 0). Basically, the three-dimensional G-type magnetic structure is maintained down to 2 K, where it is fully developed with an ordered magnetic moment of 4.25(5) μB/Fe at this temperature for x = 0.5 and 4.14(3) μB/Fe for x = 0. The data processing is complemented with a new approach to analyze the temperature dependence of the magnetic order TN on the lattice parameters, based on the magnetic hyperfine fields extracted from the temperature-dependent MS data.

show abstract

High-Pressure Synthesis and Structures of Perovskite-Type Oxyfluorides

Katsumata

Inaguma

Mori

et al. 2018

The Review of High Pressure Science and Technology

View full text Add to dashboard Cite

In this article, our recent researches on the crystal structure of the perovskite-type oxyfluorides were reviewed. Parts of these compounds were synthesized using the cubic-multi-anvil type high-pressure apparatus. In cubic oxyfluorides, the displacement from ideal positions of an anion or a cation was observed and the ion species displaced depended on the tolerance factor. The oxyfluorides containing Pb and/or Mn ions had a tetragonal structure and PbMnO 2 F containing both ions exhibit very high tetragonality (c/a＝1.10). In addition, the solid solutions between a perovskite-type oxide and an oxyfluoride or a fluoride were synthesized using high-pressure apparatus. As the result, it was revealed that one of these solid solutions, (1-x)BaTiO 3  xKTiO 2 F represented unique structures and interesting dielectric properties. [high-pressure synthesis, perovskites, oxyfluorides, crystal structure, dielectric properties]

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Phase transitions and dielectric properties of perovskite-type oxyfluorides (1-x)KNbO3-xKMgF3

Cited by 3 publications

References 33 publications

Synthesis, crystal structure and photocatalytic studies of new oxyfluoride Cu5AsO5F5

Synthesis, crystal structure and photocatalytic studies of new oxyfluoride Cu5AsO5F5

Antiferromagnetism and Structure of Sr1−xBaxFeO2F Oxyfluoride Perovskites

High-Pressure Synthesis and Structures of Perovskite-Type Oxyfluorides

Contact Info

Product

Resources

About