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A python library for handling ionic compounds

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![ions_logo](https://raw.githubusercontent.com/dembart/ions/main/ions_logo.png)

## Contents
- [About](#about)
- [Installation](#installation)
- [Minimal usage example](#minimal-usage-example)
- [Notebooks](#notebooks)
- [How to cite](#how-to-cite)

### About

ions is a python library made for studying crystalline ionic conductors

### Installation

```bash
pip install ions
```

```bash
git clone https://github.com/dembart/ions
cd ions
pip install .
```

### Minimal usage examples:

> Note: The last library update was not systematically tested. Errors are expected. Be careful.

#### Inequivalent ionic jumps (edges) forming a percolating network

```python
from ase.io import read
from ions import Percolator

file = '/Users/artemdembitskiy/Downloads/LiFePO4.cif'
atoms = read(file)

pl = Percolator(atoms, mobile_specie='Li', upper_bound=5.0)

bottleneck_radius = 0.5 
mincut, maxdim = pl.mincut_maxdim(bottleneck_radius)
print(f'Maximum percolation dimensionality: {maxdim}')
print(f'Jump distance cutoff: {mincut} angstrom', '\n')

edges = pl.unique_edges(mincut, bottleneck_radius, method = 'naive')
print(f'Inequivalent edges forming {maxdim}D percolating network:')
print(edges)
```
    Maximum percolation dimensionality: 2
    Jump distance cutoff: 4.755859375 angstrom 
    
    Inequivalent edges forming 2D percolating network:
    [[ 0  3  0 -1  0]
     [ 0  0 -1  0  0]]

#### Notebooks

- [Percolations barriers from nudged elastic band (NEB) calculations using universal machine learning interatomic potentials (UMLIPS)](notebooks/neb_umlip.ipynb)
- [Available data](notebooks/available_data.ipynb)

#### How to cite

If you use the library consider citing the [following paper](https://www.nature.com/articles/s41524-025-01571-z#code-availability):

```
@article{dembitskiy2025benchmarking,
  title={Benchmarking machine learning models for predicting lithium ion migration},
  author={Dembitskiy, Artem D and Humonen, Innokentiy S and Eremin, Roman A and Aksyonov, Dmitry A and Fedotov, Stanislav S and Budennyy, Semen A},
  journal={npj Computational Materials},
  volume={11},
  number={1},
  pages={131},
  year={2025},
  publisher={Nature Publishing Group UK London}
}
```

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