Density comparison measurement of silicon by pressure of flotation method

We have developed a new density comparison measurement system for silicon crystals using the pressure of flotation method to evaluate the consistency in the absolute densities and to study defect and impurity effects on silicon single crystals. We have carried out density comparison measurements for the density standard and Avogadro constant silicon spheres of the NRLM, Ibaraki, Japan. We have calculated the adjusted densities from our comparison and absolute measurements based on a least-squares analysis using a matrix formulation