Single crystal X-ray structure study of the Li 2-xNa xNi[PO 4]F system

Hamdi Yahia, Masahiro Shikano, Shinji Koike, Kuniaki Tatsumi, Hironori Kobayashi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The new compounds Li 2-xNa xNi[PO 4]F (x = 0.7, 1, and 2) have been synthesized by a solid state reaction route. Their crystal structures were determined from single-crystal X-ray diffraction data. Li 1.3Na 0.7Ni[PO 4]F crystallizes with the orthorhombic Li 2Ni[PO 4]F structure, space group Pnma, a = 10.7874(3), b = 6.2196(5), c = 11.1780(4) Å and Z = 8, LiNaNi[PO 4]F crystallizes with a monoclinic pseudomerohedrally twinned structure, space group P2 1/c, a = 6.772(4), b = 11.154(6), c = 5.021(3) Å, β = 90° and Z = 4, and Na 2Ni[PO 4]F crystallizes with a monoclinic twinned structure, space group P2 1/c, a = 13.4581(8), b = 5.1991(3), c = 13.6978(16) Å, β = 120.58(1)° and Z = 8. For x = 0.7 and 1, the structures contain NiFO 3 chains made up of edge-sharing NiO 4F 2 octahedra, whereas for x = 2 the chains are formed of dimer units (face-sharing octahedra) sharing corners. These chains are interlinked by PO 4 tetrahedra forming a 3D framework for x = 0.7 and different Ni[PO 4]F layers for x = 1 and 2. A sodium/lithium disorder over three atomic positions is observed in Li 1.3Na 0.7Ni[PO 4]F structure, whereas the alkali metal atoms are well ordered in between the layers in the LiNaNi[PO 4]F and Na 2Ni[PO 4]F structures, which makes both compounds of great interest as potential positive electrodes for sodium cells.

Original languageEnglish
Pages (from-to)5838-5847
Number of pages10
JournalDalton Transactions
Volume41
Issue number19
DOIs
Publication statusPublished - 21 May 2012
Externally publishedYes

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Sodium
X-Rays
Single crystals
F region
Alkali Metals
X rays
Solid state reactions
Lithium
X-Ray Diffraction
Dimers
Electrodes
Crystal structure
X ray diffraction
Atoms

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Single crystal X-ray structure study of the Li 2-xNa xNi[PO 4]F system. / Yahia, Hamdi; Shikano, Masahiro; Koike, Shinji; Tatsumi, Kuniaki; Kobayashi, Hironori.

In: Dalton Transactions, Vol. 41, No. 19, 21.05.2012, p. 5838-5847.

Research output: Contribution to journalArticle

Yahia, H, Shikano, M, Koike, S, Tatsumi, K & Kobayashi, H 2012, 'Single crystal X-ray structure study of the Li 2-xNa xNi[PO 4]F system', Dalton Transactions, vol. 41, no. 19, pp. 5838-5847. https://doi.org/10.1039/c2dt12375d
Yahia, Hamdi ; Shikano, Masahiro ; Koike, Shinji ; Tatsumi, Kuniaki ; Kobayashi, Hironori. / Single crystal X-ray structure study of the Li 2-xNa xNi[PO 4]F system. In: Dalton Transactions. 2012 ; Vol. 41, No. 19. pp. 5838-5847.
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