What is it about?
It is challenging and exhausting to clarify the atom sites in crysta, like looking for a needle in a sea. Present finding solve the needle location and explain why it is there.
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Why is it important?
Our findings indicate that even dopant atoms with extremely large size mismatch can be incorporated into host crystal lattice through Eu substitution Al at or near the surface. Single Eu prefers to remain 3+ valent due to its large ionic size while Eu owns a 2+ valence when Eu–O co‐doping is achieved as Eu2+ has fully filled 4f orbitals (4f7). This explains where and why Eu2+ is located in AlN crystal.
Perspectives
we may be able to control unique functionalities in largely mismatched systems by tuning the Eu2+/Eu3+ ratios in the lattice via manipulating samples’ particle size distribution, chemical composition and site occupation modification.
Dr Liangjun Yin
Read the Original
This page is a summary of: Direct observation of Eu atoms in AlN lattice and the first-principles simulations, Journal of the American Ceramic Society, July 2018, Wiley,
DOI: 10.1111/jace.15912.
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