Study of Properties of Amorphous BeH2 by Brillouin Scattering (CAT#: STEM-ST-0119-YJL)

Introduction

Metal hydrides are of great scientific and technological interest in view of their potential applications for hydrogen storage in fuel cells, as electrodes for rechargeable batteries, in energy-conversion devices, and in nuclear science. Metal hydrides are also of fundamental importance because of their intriguing electronic, structural, and dynamical properties associated with the hydrogen atoms. Due to its low mass and high hydrogen content, BeH2 is an intriguing if not a unique material. Amorphous BeH2 synthesized at ambient conditions can transform into two known crystalline phases5 at high temperatures and pressures; both structures are composed of network-forming tetrahedra.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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