Abstract
We have studied phosphate crystals with low dopant content using X-ray photoelectron spectroscopy (XPS), X-ray fluorescence analysis (XFA), and electron paramagnetic resonance (EPR). We have observed a new stage in the process of doping KTi2(PO4)3 with aluminum: for low aluminum content (n ≤ 0.7 at.%), the aluminum forms a new Al sublattice in the channels of the matrix and essentially does not replace titanium in the main Ti sublattice. It is shown that the anomalous physical and chemical properties of the phosphates are due to a change in the mechanism of dopant distribution in the crystal for small n. We have observed selectivity in the way aluminum occupies different types of voids. The mechanism proposed for the appearance of anomalous properties in the system KTi2(PO4)3–Al2O3–KPO3 can be used in practice for a wide range of oxide framework matrices.
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