Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic (NH 4 ) 2 FeCl 5 ·H 2 O

Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic (NH 4 ) 2 FeCl 5 ·H 2 O

We combined synchrotron-based infrared absorbance and Raman scattering spectroscopies with diamond anvil cell techniques and a symmetry analysis to explore the properties of multiferroic (NH ) FeCl ·H O under extreme pressure-temperature conditions. Compression-induced splitting of the Fe-Cl stretch...

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Bibliographic Details
Published in:Inorganic chemistry
Main Authors: Clune, Amanda J, Harms, Nathan C, Smith, Kevin A, Tian, Wei, Liu, Zhenxian, Musfeldt, Janice L
Format: Journal Article
Language:English
Published: United States 31-05-2024
Online Access:Get full text
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Summary:We combined synchrotron-based infrared absorbance and Raman scattering spectroscopies with diamond anvil cell techniques and a symmetry analysis to explore the properties of multiferroic (NH ) FeCl ·H O under extreme pressure-temperature conditions. Compression-induced splitting of the Fe-Cl stretching, Cl-Fe-Cl and Cl-Fe-O bending, and NH librational modes defines two structural phase transitions, and a group-subgroup analysis reveals space group sequences that vary depending upon proximity to the unexpectedly wide order-disorder transition. We bring these findings together with prior high-field work to develop the pressure-temperature-magnetic field phase diagram uncovering competing polar, chiral, and magnetic phases in this system.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.4c00403