Dear An,

Do you mean potentials for these alloys?

If so, you have four options at least:

> Zr-Nb Potential

Developed by D.E. Smirnova and S.V. Starikov.

It uses ADP, accurately modeling Zr and Nb phases.

Available @

https://www.ctcms.nist.gov/potentials/entry/2017--Smirnova-D-E-Starikov-S-V--Zr-Nb/2017--Smirnova-D-E--Zr-Nb--LAMMPS--ipr1.html

>>Zr-Sn Potential

Developed by Haojie Mei et al.

It includes a MEAM potential for Zr-Sn systems.

Available online too

https://github.com/meihaojie/Zr_Sn_system

>>> Nb-C, Nb-N, Fe-Nb-C, and Fe-Nb-N MEAM

These might serve as references for developing new MEAM potentials for Zr-Sn-Nb-Fe.

Dev. by Byeong-Joo Lee et al.

ResearchGate link

https://www.researchgate.net/publication/231927107_Modified_embedded-atom_method_interatomic_potentials_for_the_Nb-C_Nb-N_Fe-Nb-C_and_Fe-Nb-N_systems

>>>> LAMMPS MEAM/SW/Spline Pair Style

Combines MEAM with Stillinger-Weber (SW).

It is limited to single-element systems, so that multi-component alloys may need modifications.

Check Lammps folder:

LAMMPS MEAM/SW/Spline

Hope it helps&good luck