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Inne
Structural and spectroscopic properties of BaHfO3: Eu - the issue of the dopant location in the host lattice.
Autorzy
Rok wydania
2009
Czasopismo
Zeitschrift für Kristallographie
Numer woluminu
30
Strony
367-374
DOI
10.1524/zksu.2009.0054
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
BaHfO3:Eu powders containing 0-10% of the dopant with respect to Hf were synthesized with the classic ceramic method at 1400 degrees C. X-ray diffraction analysis proved that up to 10% of the Eu concentration the product is crystallographically pure and crystallizes in a cubic perovskite-type structure. Detailed structural measurements showed that the size of the unit cell decreases up to the Eu concentration of 3% and increases when the dopant content is further increased. Spectroscopic analysis gave evidence that three different symmetry sites of Eu3+ exist in BaHfO3:Eu(5%) powders. It is postulated that two of them results from simple substitution of the Ba2+ and Hf4+ ion sites and the third one results from (Eu-Hf(1) - Eu-Ba(center dot)) pair formation. Only one of the sites, giving emission peaking at 595.6 run is fully centrosymmetric, although positions of both metal ions in the host material possess inversion symmetry.
Słowa kluczowe
Barium hafnate, luminescence, site-selective spectroscopy, defects
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