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Magnetic structure of Ni(DCOO)2(D2O)2
Mads R V Jørgensen1, Mogens Christensen, Mette S Schmøkel
1Centre for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Århus C, Denmark.
This study investigates magnetic phase transitions in nickel formate dihydrate, clarifying magnetic structure inconsistencies. Neutron diffraction reveals two distinct canted antiferromagnetic sublattices with differing magnetic moments and temperature behaviors.
Area of Science:
- Solid State Chemistry
- Magnetism
- Materials Science
Background:
- Nickel formate dihydrate, Ni(HCOO)2(H2O)2, is a coordination polymer with low-temperature magnetic phase transitions.
- Previous studies reported conflicting results regarding its magnetic structure and phase transition temperatures.
Purpose of the Study:
- To clarify the magnetic structure and phase transitions of nickel formate dihydrate.
- To resolve inconsistencies in previously published magnetic data.
Main Methods:
- Heat capacity and magnetic susceptibility measurements were performed on various deuterated samples.
- Neutron powder diffraction experiments were conducted on a deuterated sample across a temperature range of 1.5 K to 25 K.
Main Results:
- All samples exhibited magnetic phase transitions around 3 K and 15 K.
- Neutron diffraction data refined to a magnetic model with two canted antiferromagnetic sublattices.
- Sublattices possess different magnetic moments (1.7 μB and 1.3 μB) and distinct temperature dependencies.
Conclusions:
- The study provides a refined magnetic model for nickel formate dihydrate, resolving previous inconsistencies.
- The distinct behaviors of the two magnetic sublattices offer new insights into complex magnetic ordering in coordination polymers.
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