CoMoO4/CuMo0.9W0.1O4 mixture as an efficient piezochromic sensor to detect temperature/pressure shock parameters

Area of Science:

• Materials Science
• Chemistry
• Physics

Background:

• Piezochromic materials change color under pressure, useful for shock detection.
• Existing methods often require knowing the temperature during shock events.
• Developing a universal shock detector that functions independently of temperature is a significant challenge.

Purpose of the Study:

• To demonstrate a universal shock detector capable of determining both pressure and temperature.
• To utilize the distinct temperature dependencies of transition pressures in piezochromic compounds.
• To develop a method for simultaneous pressure and temperature sensing using a mixture of materials.

Main Methods:

• Employing a mixture of two piezochromic compounds: cobalt molybdate (CoMoO4) and copper molybdate (CuMoO4-type oxides).
• Leveraging the first-order phase transition in these compounds, which is associated with a significant color change.
• Analyzing the colorimetric coordinates of the mixture to infer shock conditions.

Main Results:

• The mixture successfully indicated both the pressure and temperature of a shock event.
• The differential temperature influences on the transition pressures of CoMoO4 and CuMoO4 were effectively utilized.
• Colorimetric analysis provided a quantitative measure of the shock's impact.

Conclusions:

• A mixture of specific piezochromic compounds can serve as a universal shock detector.
• This approach eliminates the need for pre-determined temperature information for accurate shock pressure measurement.
• The colorimetric response of the compound mixture offers a practical method for in-situ shock condition determination.