title: Long-range and short-range orderings in K4Fe4P5O20 with a natrolite-like framework.
abstract: 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 (57)Fe Mössbauer spectra measurements show that K4Fe4P5O20 possesses a short-range magnetic ordering at ∼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.
authors: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. hezz@fjirsm.ac.cn
authors: Zhangzhen
authors: Z
authors: He
authors: Weilong
authors: W
authors: Zhang
authors: Wendan
authors: W
authors: Cheng
authors: Atsushi
authors: A
authors: Okazawa
authors: Norimichi
authors: N
authors: Kojima