Embedded atom model

In computational chemistry and computational physics, the embedded atom model, embedded-atom method or EAM, is an approximation describing the energy between atoms and is a type of

In a simulation, the potential energy of an atom, ${\displaystyle i}$, is given by[3]

${\displaystyle E_{i}=F_{\alpha }\left(\sum _{j\neq i}\rho _{\beta }(r_{ij})\right)+{\frac {1}{2}}\sum _{j\neq i}\phi _{\alpha \beta }(r_{ij})}$,

where ${\displaystyle r_{ij}}$ is the distance between atoms ${\displaystyle i}$ and ${\displaystyle j}$, ${\displaystyle \phi _{\alpha \beta }}$ is a pair-wise potential function, ${\displaystyle \rho _{\beta }}$ is the contribution to the electron charge density from atom ${\displaystyle j}$ of type ${\displaystyle \beta }$ at the location of atom ${\displaystyle i}$, and ${\displaystyle F}$ is an embedding function that represents the energy required to place atom ${\displaystyle i}$ of type ${\displaystyle \alpha }$ into the electron cloud.

Since the electron cloud density is a summation over many atoms, usually limited by a cutoff radius, the EAM potential is a multibody potential. For a single element system of atoms, three scalar functions must be specified: the embedding function, a pair-wise interaction, and an electron cloud contribution function. For a binary alloy, the EAM potential requires seven functions: three pair-wise interactions (A-A, A-B, B-B), two embedding functions, and two electron cloud contribution functions. Generally these functions are provided in a tabularized format and interpolated by cubic splines.

See also

• Interatomic potential
• Lennard-Jones potential
• Bond order potential
• Force field (chemistry)

References

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