Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic (NH4)2FeCl5·H2O

Amanda J. Clune; Nathan C. Harms; Kevin A. Smith; Wei Tian; Zhenxian Liu; Janice L. Musfeldt

doi:10.1021/acs.inorgchem.4c00403

Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic (NH₄)₂FeCl₅·H₂O

Amanda J. Clune, Nathan C. Harms, Kevin A. Smith, Wei Tian, Zhenxian Liu, Janice L. Musfeldt

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Abstract

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 (NH₄)₂FeCl₅·H₂O under extreme pressure-temperature conditions. Compression-induced splitting of the Fe-Cl stretching, Cl-Fe-Cl and Cl-Fe-O bending, and NH₄⁺ 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.

Original language	English
Pages (from-to)	11021-11029
Number of pages	9
Journal	Inorganic Chemistry
Volume	63
Issue number	24
DOIs	https://doi.org/10.1021/acs.inorgchem.4c00403
State	Published - Jun 17 2024

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abstract = "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 (NH4)2FeCl5·H2O under extreme pressure-temperature conditions. Compression-induced splitting of the Fe-Cl stretching, Cl-Fe-Cl and Cl-Fe-O bending, and NH4+ 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.",

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AU - Clune, Amanda J.

AU - Harms, Nathan C.

AU - Smith, Kevin A.

AU - Tian, Wei

AU - Liu, Zhenxian

AU - Musfeldt, Janice L.

PY - 2024/6/17

Y1 - 2024/6/17

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AB - 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 (NH4)2FeCl5·H2O under extreme pressure-temperature conditions. Compression-induced splitting of the Fe-Cl stretching, Cl-Fe-Cl and Cl-Fe-O bending, and NH4+ 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.

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JO - Inorganic Chemistry

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Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic (NH₄)₂FeCl₅·H₂O

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