# $\alpha$ and $\beta$ relaxation



## 2016 [Intrinsic correlation between β-relaxation and spatial heterogeneity in a metallic glass](https://www.nature.com/articles/ncomms11516)

## 1995 [Metallic glasses](http://glass.rutgers.edu/sites/default/files/uploads/dir.surface/greer.pdf) - general picture

## see Internal friction plot - 1986 [Low temperature properties of glasses-unsolved problems - A K RAYCHAUDHURI](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5474/raychaud.pdf)

> **The key problem in the physics of glass is relaxation and the key question is what is relaxing**

> While $\alpha$-relaxation involves structural changes (unlocking of liquid-like defects as T increases through Tg) involving higher
> energy, $\beta$-relaxation involves localized structural changes. But both of them are classical thermally activated crossing of barriers although not of the pure Arrhenius type. "TLS relaxation" also involves localized structural changes, probably of the same type as in
> $\beta$ relaxation **but the mechanism of relaxation is quantum mechanical in origin**

- $\beta$-relaxation (Boson peak) is related to $TLS$-relaxation


# Parents

* below $T_G$ glass temperature
* Glasses and Glass transition -core node⏎

# Attachments

* [](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5474/raychaud.pdf)