Long-range and short-range orderings in K4Fe4P5O20 with a natrolite-like framework

Zhangzhen He; Weilong Zhang; Wendan Cheng; Atsushi Okazawa; Norimichi Kojima

doi:10.1039/C3DT32897J

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Dalton Transactions

Issue 16, 2013

The international journal for inorganic, organometallic and bioinorganic chemistry

Impact Factor 3.838 48 Issues per Year Indexed in MEDLINE

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Paper

Long-range and short-range orderings in K₄Fe₄P₅O₂₀ with a natrolite-like framework

Zhangzhen He,*^a Weilong Zhang,^a Wendan Cheng,^a Atsushi Okazawa^b and Norimichi Kojima^b

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Corresponding authors

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China
E-mail: hezz@fjirsm.ac.cn

Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan

Dalton Trans., 2013,42, 5860-5865

DOI: 10.1039/C3DT32897J
Received 04 Dec 2012, Accepted 03 Feb 2013
First published online 04 Feb 2013

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Abstract
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K₄Fe₄P₅O₂₀ shows an interesting natrolite-like structure with a spin–tetrahedron lattice built by mixed valence Fe ions. Single crystals of the title compound are successfully grown by the flux method using KF as flux. Magnetic results combined from magnetic, heat capacity, and ⁵⁷Fe Mössbauer spectra measurements show that K₄Fe₄P₅O₂₀ possesses a short-range magnetic ordering at [similar] 13 K and a long-range ordering at 7 K. Magnetic anisotropy of K₄Fe₄P₅O₂₀ is observed between H‖c and H⊥c, suggesting that the c-axis is the magnetic easy-axis. The spin arrangements in the system are suggested to be ferrimagnetic along the natrolite chains.