Crystal Structures and Low-Dimensional Ferromagnetism of Sodium Nickel Phosphates Na 5 Ni 2 (PO 4 ) 3 ·H 2 O and Na 6 Ni 2 (PO 4 ) 3 OH

Maria A. Kirsanova, Dmitry A. Aksyonov, Olga V. Maximova, Larisa V. Shvanskaya, Alexander N. Vasiliev, Alexander A. Tsirlin, Artem M. Abakumov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Two new sodium nickel phosphates, Na 5 Ni 2 (PO 4 ) 3 ·H 2 O (I) and Na 6 Ni 2 (PO 4 ) 3 OH (II), have been synthesized hydrothermally and characterized by synchrotron X-ray diffraction, electron diffraction, low-temperature thermodynamic and magnetic measurements, and ab initio calculations. Unlike the majority of Ni 2+ compounds, I and II show predominant ferromagnetic exchange couplings. I crystallizes in the monoclinic space group P2 1 /n (a = 14.0395(4) Å, b = 5.1847(14) Å, c = 16.4739(4) Å, β = 110.4186(14)°) and features chains of ferromagnetically coupled Ni 2+ ions. In II with the orthorhombic space group Pcmb (a = 7.5007(15) Å, b = 21.4661(4) Å, c = 7.1732(15) Å), the ferromagnetically coupled Ni 2+ ions form dimers arranged on a spin ladder. Both compounds represent rare examples of quasi-one-dimensional ferromagnets. Structural features behind this unusual magnetic behavior are discussed.

Original languageEnglish
Pages (from-to)610-621
Number of pages12
JournalInorganic Chemistry
Volume58
Issue number1
DOIs
Publication statusPublished - 7 Jan 2019

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