No.9（2014）6.Development of functional materials for pressure measurements

Toru Yoshino, Kazuhiro Ookubo, Toshiyuki Yamanaka, Sadayuki Watanabe

  In press working, it is important to precisely evaluate an effective pressure and 2D distribution of pressure. Here we show functional materials made from amorphous calcium carbonate and cobalt chloride, which can be applied for a measurement of pressure. The functional materials can be changed in color by reaction between the cobalt chloride and the water separated from amorphous calcium carbonate in a compression. We quantified the change of color depending on compression pressure from UV-Vis spectra, and formulated a relation between the color and the pressure under wide pressure range; from 10 MPa to 1050 MPa.

Keywords
High pressure, Calcium carbonate, Crystallization, Amorphous materials

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