Abstract
Phosphate solid solutions based on the whitlockite family Ca9 – xMxDy(PO4)7 (M = Zn2+ or Mg2+) have been obtained. The samples have been investigated by a combination of the methods, such as X‑ray diffraction analysis, second optical harmonic generation, and luminescence spectroscopy. It is established that the unit-cell symmetry change (R3c → \(R\bar {3}c\)) in the solid-solution series with an increase in the degree of substitution Ca2+ → M2+; the concentration dependence is determined. Phase transitions of the ferro- and antiferroelectric types, as well as their temperature positions, have been determined by dielectric spectroscopy. The synthesized samples exhibit strong luminescence under 350-nm excitation with the resulting radiation in the white region in color coordinates.
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This study was supported by the Russian Science Foundation, grant no. 19-77-10013.
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Nikiforov, I.V., Deyneko, D.V. & Duskaev, I.F. Structural Features of Phosphates Ca9 – xMxDy(PO4)7 (M = Zn2+ or Mg2+). Phys. Solid State 62, 860–864 (2020). https://doi.org/10.1134/S1063783420050200
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DOI: https://doi.org/10.1134/S1063783420050200