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Fjellvåg Ø, Gonano B, Bernal FLM, Amedi SB, Lyu J, Pomjakushin V, Medarde M, Chernyshov D, Marshall K, Valldor M, Fjellvåg H, Hauback BC. Order-to-Disorder Transition and Hydrogen Bonding in the Jahn-Teller Active NH 4CrF 3 Fluoroperovskite. Inorg Chem 2024; 63:10594-10602. [PMID: 38787284 PMCID: PMC11167635 DOI: 10.1021/acs.inorgchem.4c00931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/26/2024] [Accepted: 05/10/2024] [Indexed: 05/25/2024]
Abstract
Large quantities of high-purity NH4CrF3 have been synthesized using a wet-chemical method, and its structural chemistry and magnetic properties are investigated in detail for the first time. NH4CrF3 is a tetragonal fluoroperovskite that displays an ordering of the ammonium (NH4+) groups at room temperature and C-type orbital ordering. The ammonium groups order and display distinct signs of hydrogen bonds to nearby fluoride anions by buckling the Cr-F-Cr angle away from 180°. The ammonium ordering remains up to 405 K, much higher than in other ammonium fluoroperovskites, indicating a correlation between the flexibility of the Jahn-Teller ion, the hydrogen bond formation, and the ammonium ordering. At 405 K, an order-to-disorder transition occurs, where the ammonium groups disorder, corresponding to a transition to higher symmetry. This is accompanied by a contraction of the unit cell from breaking hydrogen bonds, similar to the phenomenon observed in water ice melting. The compound orders antiferromagnetically with a Neél temperature of 60 K, an effective paramagnetic moment of 4.3 μB, and a Weiss temperature of -33 K. An A-type antiferromagnetic structure is identified by neutron diffraction, with an ordered moment of 3.72(2) μB.
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Affiliation(s)
- Øystein
S. Fjellvåg
- Department
for Hydrogen Technology, Institute for Energy
Technology, P.O. Box 40, Kjeller NO-2027, Norway
- Laboratory
for Neutron Scattering and Imaging, Paul
Scherrer Institute, Villigen-PSI CH-5232, Switzerland
| | - Bruno Gonano
- Chemistry
Department and Center for Material Science and Nanotechnology, University of Oslo, Oslo NO-0315, Norway
| | - Fabian L. M. Bernal
- Division
for Research, Dissemination and Education, IT-department, University of Oslo, Oslo 0316, Norway
| | - Salah B. Amedi
- Chemistry
Department and Center for Material Science and Nanotechnology, University of Oslo, Oslo NO-0315, Norway
| | - Jike Lyu
- Laboratory
for Multiscale Materials Experiments, Paul
Scherrer Institut, Villigen-PSI CH-5232, Switzerland
| | - Vladimir Pomjakushin
- Laboratory
for Neutron Scattering and Imaging, Paul
Scherrer Institute, Villigen-PSI CH-5232, Switzerland
| | - Marisa Medarde
- Laboratory
for Multiscale Materials Experiments, Paul
Scherrer Institut, Villigen-PSI CH-5232, Switzerland
| | - Dmitry Chernyshov
- Swiss-Norwegian
Beam Lines at European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France
| | - Kenneth Marshall
- Swiss-Norwegian
Beam Lines at European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France
| | - Martin Valldor
- Chemistry
Department and Center for Material Science and Nanotechnology, University of Oslo, Oslo NO-0315, Norway
| | - Helmer Fjellvåg
- Chemistry
Department and Center for Material Science and Nanotechnology, University of Oslo, Oslo NO-0315, Norway
| | - Bjørn C. Hauback
- Department
for Hydrogen Technology, Institute for Energy
Technology, P.O. Box 40, Kjeller NO-2027, Norway
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