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Pressure-Induced Amorphization of Diisopropylammonium Perchlorate Studied by Raman Spectroscopy and X-ray
Shradhanjali Sahoo1, T R Ravindran1, R Rajaraman1
1Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam 603102, Tamil Nadu, India.
Triclinic diisopropylammonium perchlorate (DIPAP) shows a phase transition at 0.6 GPa and amorphization at 1.5 GPa, potentially impacting its room-temperature ferroelectricity. The material
Area of Science:
- Solid-state physics
- Materials science
- Crystallography
Background:
- Diisopropylammonium salts are known for their room-temperature ferroelectric properties.
- Triclinic diisopropylammonium perchlorate (DIPAP) is a specific salt exhibiting ferroelectricity at ambient conditions.
Purpose of the Study:
- To investigate the structural and phase transitions of DIPAP under high pressure.
- To understand the relationship between structural changes and ferroelectric properties.
Main Methods:
- Density functional theory (DFT) calculations for phonon mode assignment.
- High-pressure Raman spectroscopy up to ~3 GPa.
- High-pressure synchrotron X-ray diffraction (XRD).
Main Results:
- An isostructural phase transition was observed at 0.6 GPa via XRD, accompanied by changes in NH2 bending and stretching modes in Raman spectra.
- Amorphization occurred at 1.5 GPa, indicated by broadening of lattice modes in Raman and confirmed by XRD.
- The bulk modulus of DIPAP was determined to be 16.5 GPa.
- The ambient phase was found to be reversible upon pressure release.
Conclusions:
- High pressure induces significant structural changes in DIPAP, including an isostructural transition and amorphization.
- These transitions likely affect the hydrogen network and may lead to a loss of ferroelectricity above 1.5 GPa.
- DIPAP exhibits reversible structural behavior after pressure is released.
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