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Updated: Oct 9, 2025
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
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Mixed-metal phosphates K1.64Na0.36TiFe(PO4)3 and K0.97Na1.03Ti1.26Fe0.74(PO4)3 with a langbeinite framework
Igor V Zatovsky1, Nataliia Yu Strutynska2, Ivan V Ogorodnyk3
1F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS Ukraine, 42 Acad. Vernadskoho blv., 03142 Kyiv, Ukraine.
Acta Crystallographica. Section E, Crystallographic Communications
|December 20, 2021
Summary
New langbeinite-type titanium iron phosphates were synthesized. These novel materials feature a 3D framework built from titanium-iron octahedra and phosphate tetrahedra, with potassium and sodium cations located in framework cavities.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Langbeinite-type structures are known for their diverse chemical compositions and potential applications.
- Titanium and iron phosphates are of interest due to their unique structural and electronic properties.
Purpose of the Study:
- To synthesize and characterize novel langbeinite-type titanium iron phosphates.
- To investigate the crystal structure and cation site occupancies in these new compounds.
Main Methods:
- Single crystal growth from high-temperature self-fluxes.
- Crystallization in the Na2O-K2O-P2O5-TiO2-Fe2O3 system.
- X-ray diffraction analysis to determine crystal structures.
Main Results:
- Two isotypic langbeinite-type phosphates, K1.65Na0.35TiFe(PO4)3 and K0.97Na1.03Ti1.26Fe0.74(PO4)3, were successfully synthesized.
- The crystal structure features a 3D framework of [(Ti/Fe)2(PO4)3] units with mixed Ti/Fe octahedra linked by PO4 tetrahedra.
- Potassium and sodium cations occupy two distinct sites within the framework cavities, exhibiting coordination numbers of 9 and 12.
Conclusions:
- The study successfully synthesized and characterized novel langbeinite-type titanium iron phosphates.
- The determined crystal structures provide insights into the framework topology and cation distribution.
- These findings contribute to the understanding of structure-property relationships in complex inorganic phosphates.
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