Repozytorium

Spatial distribution of the Yb3+ rare earth ions in Y3Al5O12 and Y2O3 optical ceramics as analyzed by TEM.

Autorzy

Thierry Epicier

Georges Boulon

W. Zhao

Małgorzata Guzik

B. Jiang

A. Ikesue

Laura Esposito

Rok wydania

2012

Czasopismo

Journal of Materials Chemistry

Numer woluminu

22

Strony

18221-18229

DOI

10.1039/c2jm32995f

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

There is a need to investigate the possible improvements of rare earth ion-doped transparent ceramics in terms of better optical performances for lasers, scintillators and phosphors. Especially, the spatial distribution of the rare earth ions within their host material is important for quenching processes. Results from Transmission Electron Microscopy (TEM, both conventional and high resolution TEM) and EDX (energy dispersive X-ray) quantitative chemical analysis positively show that there is no significant segregation of Yb3+ ions, the last active rare earth element, in the grain boundaries of Yb3+-doped YAG and Yb3+-doped Y2O3 polycrystalline ceramics. The large value of the Yb3+ segregation coefficient (1.09 in YAG ceramic) explains the homogeneity of this distribution, in opposition to the low values of the Ce3+ and Nd3+ segregation coefficients, the first active rare earth elements, (0.08 and 0.18 respectively in YAG ceramic), which leads to a strong segregation at grain boundaries.

Adres publiczny

http://dx.doi.org/10.1039/c2jm32995f

Strona internetowa wydawcy

https://www.rsc.org/

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