Investigation of a Structural Phase Transition and Magnetic Structure of Na2BaFe(VO4)2: A Triangular Magnetic Lattice with a Ferromagnetic Ground State

Liurukara D. Sanjeewa, Vasile O. Garlea, Michael A. McGuire, Matthias Frontzek, Colin D. McMillen, Kyle Fulle, Joseph W. Kolis

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The structural and magnetic properties of a glaserite-type Na2BaFe(VO4)2 compound, featuring a triangular magnetic lattice of Fe2+ (S = 2), are reported. Temperature dependent X-ray single crystal studies indicate that at room temperature the system adopts a trigonal P3m1 structure and undergoes a structural phase transition to a C2/c monoclinic phase slightly below room temperature (Ts = 288 K). This structural transition involves a tilting of Fe-O-V bond angles and strongly influences the magnetic correlation within the Fe triangular lattice. The magnetic susceptibility measurements reveal a ferromagnetic transition near 7 K. Single crystal neutron diffraction confirms the structural distortion and the ferromagnetic spin ordering in Na2BaFe(VO4)2. The magnetic structure of the ordered state is modeled in the magnetic space group C2′/c′ that implies a ferromagnetic order of the a and c moment components and antiferromagnetic arrangement for the b components. Overall, the Fe magnetic moments form ferromagnetic layers that are stacked along the c-axis, where the spins point along one of the (111) facets of the FeO6 octahedron.

Original languageEnglish
Pages (from-to)14842-14849
Number of pages8
JournalInorganic Chemistry
Volume56
Issue number24
DOIs
StatePublished - Dec 18 2017

Funding

The authors thank the National Science Foundation for financial support, Grant No. DMR-1410727. Work at the Oak Ridge National Laboratory was sponsored by the Scientific User Facilities Division (neutron diffraction) and Materials Sciences and Engineering Division (magnetization measurements), Office of Basic Energy Sciences, US Department of Energy (DOE).

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