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Co(1-x)Mg(x)MoO4 compounds for pressure indicators
L Righetti1, L Robertson, A Largeteau
1CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. Albert Schweitzer, F-33608 Pessac Cedex, France.
Cobalt magnesium molybdate (Co(1-x)Mg(x)MoO(4)) oxides act as pressure indicators by changing color during a phase transition. Magnesium content, grain size, and pressure application method tune the transition pressure, enabling pressure sensing from bars to kbars.
Area of Science:
- Materials Science
- Solid State Chemistry
- Mineral Physics
Background:
- Phase transitions in materials can be pressure-dependent.
- Color changes associated with phase transitions can be visually monitored.
- Tuning material properties is crucial for developing novel sensors.
Purpose of the Study:
- Investigate Co(1-x)Mg(x)MoO(4) oxide compositions as pressure indicators.
- Characterize the pressure-induced phase transition from beta to alpha form.
- Determine the influence of key parameters on the transition pressure.
Main Methods:
- Synthesis of Co(1-x)Mg(x)MoO(4) with varying magnesium content (x=0, 0.4).
- Monitoring powder diffuse reflection (color) changes under applied pressure.
- Analysis of magnesium content, powder grain size, and pressure application mode (uniaxial, isostatical).
Main Results:
- A first-order phase transition from beta to alpha form was observed.
- The transition pressure was tunable by adjusting magnesium content.
- Powder grain size and pressure application mode also influenced the transition pressure.
- Tuning enabled pressure indication across a wide range (bars to kbars).
Conclusions:
- Co(1-x)Mg(x)MoO(4) oxides are viable pressure indicators.
- The transition pressure can be precisely controlled through material and experimental parameter adjustments.
- These materials offer a versatile platform for pressure sensing applications.
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