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High pressure Raman scattering study on Sm2Mo4O15 system.
S D Silva Santos1, W Paraguassu1, M Maczka2
1Faculdade de Física, Universidade Federal do Pará, P.O. Box 479, Belém, PA 66075-110, Brazil.
High-pressure experiments reveal Sm2Mo4O15 undergoes irreversible amorphization at 5.0 GPa. This structural change, unlike other molybdates, has a strong first-order character, forming an amorphous phase.
Area of Science:
- Materials Science
- Solid State Chemistry
- High-Pressure Physics
Background:
- Molybdates and tungstates are known to undergo pressure-induced amorphization.
- Understanding structural transitions under pressure is crucial for materials design.
Purpose of the Study:
- To investigate the high-pressure behavior of the Sm2Mo4O15 system.
- To characterize the structural changes and phase transitions under applied pressure.
Main Methods:
- High-pressure Raman spectroscopy up to 7.9 GPa.
- Lattice dynamics calculations for mode assignment.
Main Results:
- Sm2Mo4O15 exhibits irreversible structural amorphization at 5.0 GPa.
- The amorphization process shows a strongly first-order character, distinct from other molybdates.
- The amorphous phase formation is linked to the hindrance of a P1¯ to P2/m structural phase transition.
Conclusions:
- Sm2Mo4O15 displays unique pressure-induced amorphization behavior.
- The study provides insights into the mechanism of amorphization in molybdates.
- Raman mode assignments for the ambient-pressure phase were proposed.
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