Wydział Chemii

Kacper Albin Prokop

Miłosz Siczek

Elżbieta Tomaszewicz

Krzysztof Rola

Yannick Guyot

Georges Boulon

Małgorzata Guzik

2024

Ceramics International

50

8042-8056

10.1016/j.ceramint.2023.12.132

Naukowa

Angielski

Artykuł

Cubic phosphates of M₃Y(PO₄)₃ (M = Sr²⁺ or Ba²⁺) from the eulytite family were studied as potential candidates for new optical polycrystalline ceramics showing transparency. Two series of Nd³⁺-doped Ba₃Y(PO₄)₃ and Sr₃Y(PO₄)₃ micro-powders were synthesized via solid-state reaction method. The correlation between their structure and spectroscopic properties and the effect of divalent Sr²⁺/Ba²⁺ cation creating a network was analyzed in detail. The crystal structure of Ba₃Y(PO₄)₃ and Sr₃Y(PO₄)₃ was solved ab initio based on their single crystals. Y³⁺ and Sr²⁺/Ba²⁺ ions do not share the same symmetry site and some slight distortion over crystallographic positions occupied by divalent and trivalent ions in the cationic sublattice was visible. Nd³⁺ reside at the Y³⁺ site but partial substitution of Ba²⁺ or Sr²⁺ cannot be excluded. The cationic and anionic disorder is reflected in spectroscopic properties. Nd³⁺ ion used as a structural probe shows multisite character and inhomogeneous distribution in both types of material, as determined using absorption spectroscopy at 4.2 K and laser-excited site-selective luminescence spectroscopy at 77 K. This is also clearly seen in excited state dynamics of ⁴F_3/2 doublet analysis. A greater order for barium host lattice was observed. Also, the first un-doped translucent ceramics were obtained from micro-crystalline powders.

http://dx.doi.org/10.1016/j.ceramint.2023.12.132

http://www.elsevier.com