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- W3205847408 abstract "Our experiments demonstrate that alloying the cubic-phase $mathrm{Yb}mathrm{N}$ into the wurtzite-phase $mathrm{Al}mathrm{N}$ results in clear mechanical softening and enhanced electromechanical coupling of $mathrm{Al}mathrm{N}$. First-principle calculations reproduce experimental results well, and predict a maximum 270% increase in electromechanical coupling coefficient caused by (1) an enhanced piezoelectric response induced by the local strain of $mathrm{Yb}$ ions and (2) a structural flexibility of the $(mathrm{Yb},mathrm{Al})mathrm{N}$ alloy. Extensive calculations suggest that the substitutional neighbor $mathrm{Yb}$-$mathrm{Yb}$ pairs in wurtzite $mathrm{Al}mathrm{N}$ are energetically stable along the $c$ axis, and avoid forming on the basal plane of the wurtzite structure due to the repulsion between them, which explains why $(mathrm{Yb},mathrm{Al})mathrm{N}$ films with high $mathrm{Yb}$ concentrations are difficult to fabricate in our sputtering experiments. Moreover, the neighbor $mathrm{Yb}$-$mathrm{Yb}$ pair interactions also promote structural flexibility of $(mathrm{Yb},mathrm{Al})mathrm{N}$, and are considered a cause for mechanical softening of $(mathrm{Yb},mathrm{Al})mathrm{N}$." @default.
- W3205847408 created "2021-10-25" @default.
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- W3205847408 date "2021-10-08" @default.
- W3205847408 modified "2023-09-25" @default.
- W3205847408 title "Origin of Enhanced Electromechanical Coupling in (Yb,Al)N Nitride Alloys" @default.
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- W3205847408 doi "https://doi.org/10.1103/physrevapplied.16.044009" @default.
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