Powder vibration studied by M\"{o}ssbauer spectroscopy

TL;DR

This study uses Mössbauer spectroscopy to analyze ultrasound vibrations in granular powder, revealing detailed information about granular dynamics and enabling measurement of ultrasound decay and particle convection.

Contribution

The paper introduces a novel application of Mössbauer spectroscopy to study ultrasound vibrations in granular materials, providing new insights into their dynamic behavior.

Findings

Spectral splitting into a comb structure correlates with vibration frequency.

Method developed to measure ultrasound decay in granular materials.

Estimated particle convection dynamics in the powder pile.

Abstract

M\"{o}ssbauer spectroscopy is applied to study ultrasound vibration of a granular material. A pile of powder is placed onto the surface of piezo transducer vibrated with the frequency 12.68 MHz. The size of grains (1.3 $\mu$m) is much smaller than the wavelength of ultrasound, but much larger than the vibration amplitude. Due to vibration a single line of the M\"{o}ssbauer transmission spectrum is split into a comb structure with a period equal to the vibration frequency. This spectrum contains the information about fast and slow modes in granular dynamics. We developed a method which allows to measure decay of ultrasound in the granular material and to estimate the results of the particle convection of grains in the pile.