Structural relationships among LiNaMg[PO4]F and Na 2M[PO4]F (M = Mn-Ni, and Mg), and the magnetic structure of LiNaNi[PO4]F

Hamdi Yahia, Masahiro Shikano, Hironori Kobayashi, Maxim Avdeev, Samuel Liu, Chris D. Ling

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7 Citations (Scopus)

Abstract

The new compound LiNaMg[PO4]F has been synthesized by a wet chemical reaction route. Its crystal structure was determined from single-crystal X-ray diffraction data. LiNaMg[PO4]F crystallizes with the monoclinic pseudomerohedrally twinned LiNaNi[PO4]F structure, space group P21/c, a = 6.772(4), b = 11.154(6), c = 5.021(3) Å, β = 90.00(1)° and Z = 4. The structure contains [MgO 3F]n chains made up of zigzag edge-sharing MgO 4F2 octahedra. These chains are interlinked by PO 4 tetrahedra forming 2D-Mg[PO4]F layers. The alkali metal atoms are well ordered in between these layers over two atomic positions. The use of group-subgroup transformation schemes in the Bärnighausen formalism enabled us to determine precise phase transition mechanisms from LiNaNi[PO 4]F- to Na2M[PO4]F-type structures (M = Mn-Ni, and Mg) (see video clip 1 and 2). The crystal and magnetic structure and properties of the parent LiNaNi[PO4]F phase were also studied by magnetometry and neutron powder diffraction. Despite the rather long interlayer distance, dmin(Ni+2-Ni+2) ∼ 6.8 Å, the material develops a long-range magnetic order below 5 K. The magnetic structure can be viewed as antiferromagnetically coupled ferromagnetic layers with moments parallel to the b-axis.

Original languageEnglish
Pages (from-to)2044-2051
Number of pages8
JournalDalton Transactions
Volume43
Issue number5
DOIs
Publication statusPublished - 7 Feb 2014
Externally publishedYes

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ASJC Scopus subject areas

  • Inorganic Chemistry

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