English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Potassium Ion Conductivity in the Cubic Labyrinth of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI)

MPS-Authors
/persons/resource/persons126823

Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Albrecht, R., Hoelzel, M., Beccard, H., Rüsing, M., Eng, L., Doert, T., et al. (2021). Potassium Ion Conductivity in the Cubic Labyrinth of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI). Chemistry – A European Journal, 27, 14299-14306. doi:10.1002/chem.202102464.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2DA4-C
Abstract
Orange-colored crystals of the oxoferrate tellurate K12+6xFe6Te4-xO27 [x=0.222(4)] were synthesized in a potassium hydroxide hydroflux with a molar water-base ratio n(H2O)/n(KOH) of 1.5 starting from Fe(NO3)(3) . 9H(2)O, TeO2 and H2O2 at about 200 degrees C. By using (NH4)(2)TeO4 instead of TeO2, a fine powder consisting of microcrystalline spheres of K12+6xFe6Te4-xO27 was obtained. K12+6xFe6Te4-xO27 crystallizes in the acentric cubic space group I4? 3d. [(FeO5)-O-III] pyramids share their apical atoms in [Fe2O9] groups and two of their edges with [(TeO6)-O-VI] 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 LiNbO3.The potassium cations are mobile in channels that run along the directions and cross in cavities acting as nodes. The ion conductivity of cold-pressed pellets of ball-milled K12+6xFe6Te4-xO27 is 2.3x10(-4) S . cm(-1) at room temperature. Magnetization measurements and neutron diffraction indicate antiferromagnetic coupling in the [Fe2O9] groups.