Orange-colored crystals of the oxoferrate tellurate K Fe Te O [x=0.222(4)] were synthesized in a potassium hydroxide hydroflux with a molar water-base ratio n(H O)/n(KOH) of 1.5 starting from Fe(NO ) ⋅ 9H O, TeO and H O at about 200 °C. By using (NH ) TeO instead of TeO , a fine powder consisting of microcrystalline spheres of K Fe Te O was obtained. K Fe Te O crystallizes in the acentric cubic space group I 3d. [Fe O ] pyramids share their apical atoms in [Fe O ] groups and two of their edges with [Te O ] octahedra to form an open framework that consists of two loosely connected, but not interpenetrating, chiral networks. The flexibility of the hinged oxometalate network manifests in a piezoelectric response similar to that of LiNbO .The potassium cations are mobile in channels that run along the <111> directions and cross in cavities acting as nodes. The ion conductivity of cold-pressed pellets of ball-milled K Fe Te O is 2.3×10 S ⋅ cm at room temperature. Magnetization measurements and neutron diffraction indicate antiferromagnetic coupling in the [Fe O ] groups.
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| http://dx.doi.org/10.1002/chem.202102464 | DOI Listing |
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