A new pseudo-polymorph in mineral sphenicidite family (NH4)[Fe-2(OH)(H2O)(PO4)(2)]center dot 1.5H(2)O exhibiting spontaneous magnetization below 25 K

作者：Zhou, Hong; Duan, Hai-bao; Zhang, Hui; Ren, Xiao-Ming^*

来源：Solid State Sciences, 2010, 12(10): 1816-1821.

DOI：10.1016/j.solidstatesciences.2010.08.002

• Iron phosphate
• Open-framework material
• Spin canting
• Spontaneous magnetization

The hydrothermal synthesis and structure for a new iron phosphate based open-framework solid, (NH4) [Fe-2(OH)(H2O)(PO4)2]center dot 1.5H(2.)O, is presented. The three-dimensional (3-D) framework is built from butterfly-shaped tetranuclear iron-oxygen clusters, which are coordinated by eight PO4 tetrahedra to create 8-membered windows along the a-, b- and c-axes; the lattice water molecules as well as the counter NH4+ cations reside in the cross channels. The new open-framework solid is a pseudo-polymorph with the known structure of the mineral sphenicidite, and exhibits spontaneous magnetization in the low temperature regime with T-N approximate to 25 K, which is a result of canted spin antiferromagnetism.

• 出版日期2010-10
• 单位南京工业大学; 南京晓庄学院