# Comments on the elastic properties in solid solutions of silver halides

## TL;DR

This paper proposes a simple model to estimate the compressibility of mixed silver halide crystals using only the properties of the pure end members and a defect volume parameter, simplifying previous complex calculations.

## Contribution

It introduces a novel model that relates the compressibility of solid solutions to their end members and a defect volume parameter, reducing computational complexity.

## Key findings

- The model accurately estimates the compressibility of AgClxBr1-x solid solutions.
- It simplifies the calculation of elastic properties in mixed crystals.
- The approach aligns with first-principles calculations and experimental data.

## Abstract

Recently first principles microscopic calculations, using the generalized gradient approximation, appeared for the solid mixed system $AgCl{_x}Br_{1-x}$ at various compositions. Here, we suggest a model that can estimate the compressibility of the mixed crystals in terms of the compressibilities of the end members alone. This model makes use of a single parameter, i.e., the compressibility of a defect volume, when considering the volume variation produced by the addition of a "foreign molecule" to a host crystal as a defect volume.