During recent years, there has been extensive research conducted on phosphate and arsenate metal alkaline materials due to their unique properties such as catalytic and optical characteristics. Transition metals, particularly iron, have been found to play a significant role in achieving remarkable magnetic features. Monovalent alkaline ions are responsible for ionic conductivity in open framework structures.
The mineral Wyllieite, with the ideal formula Na2FeII2Al(PO4)3, was the first phase described in pegmatites. Later, a variety of wyllieite known as ferrowyllieite, with the formula Na2MnII FeIIAl(PO4)3, was discovered. True wyllieite exists as a MnII variety, namely Na2MnII FeIIAl(PO4)3. The crystal structure of wyllieite has been found to be very close to that of Na2MnII (FeII FeIII) [PO4]3.
Several minerals of the wyllieite family have been found in recent decades. Among them, three arsenates, Ag1.09Mn3.46(AsO4)3, Na0.5K0.65Mn3.43(AsO4)3, and Na1.25Co2.187Al1.125(AsO4)3, have been synthesized. The study of Na+ conduction in Na1.25Co2.187Al1.125(AsO4)3 indicates poor ionic conductivity, suggesting wyllieites may not be ideal conductive materials. However, due to their crystalline structure, which closely resembles allaudites, wyllieites may still be a valuable source of Alkaline Conductive materials.
To investigate this further, crystallized powders of new Na1.5MnII3MnIII0.5(AsO4)3 and Na1.5MnII3FeIII0.5(AsO4)3 compounds were synthesized. The migration pathways of Na+ were analyzed using the bond valence sum energy (BVSE) model, and the dielectric properties were examined using complex impedance spectroscopy.
The materials were obtained through high-temperature solid-state combustion reactions. The crystalline powders of Na1.5MnII3MnIII0.5(AsO4)3 and Na1.5MnII3FeIII0.5(AsO4)3 were synthesized and analyzed using various techniques such as X-ray diffraction, FTIR, Raman spectroscopy, thermal gravimetry, differential thermal analysis, scanning electron microscopy, and energy dispersion X-ray spectroscopy.
The results and analysis of the materials’ structure, morphology, and electrical properties will shed light on the potential of wyllieite materials as alkaline conductive substances.
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