Abstract
The pressure effects of physical/chemical properties of a material are important to realize a relationship between its structure and the properties. Characteristic properties exhibited in some materials with nano spaces are particularly affected by pressure because the densification occurs selectively around the porous or weak-bonded portions in their structures. However, pressure distribution and shear stress often hides a critical phenomenon caused by pressure. Highly hydrostatic helium pressure medium can solve the problem and provide high quality experimental data. This report introduces some experimental examples, a high-pressure Raman scattering spectroscopy on α-boron and a powder x-ray diffraction study on type-I′ Ge-clathrate Ba24Ge100, using the helium pressure.
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