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Updated: May 20, 2025
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Crystal Structure and Low-Dimensional Magnetism in CsNiV2O6Cl
Larisa V Shvanskaya1,2, Evgeny I Ovcharenko1, Nina G Zinovieva1
1Lomonosov Moscow State University, Moscow 119991, Russia.
Inorganic Chemistry
|May 6, 2025
Summary
Single crystals of CsNiV2O6Cl exhibit Haldane-type magnetic behavior due to Ni2+ chains. Antiferromagnetic ordering at 5.6 K is attributed to defects, not intrinsic properties.
Area of Science:
- Solid State Chemistry
- Magnetism and Magnetic Materials
- Crystal Structure Analysis
Background:
- The study investigates the magnetic properties of novel compounds with complex chain structures.
- Understanding magnetic interactions in low-dimensional systems is crucial for materials science.
Purpose of the Study:
- To synthesize and characterize single crystals of CsNiV2O6Cl.
- To elucidate the magnetic behavior and phase transitions of this compound.
- To determine the nature of magnetic interactions and ordering.
Main Methods:
- Hydrothermal crystal growth.
- X-ray diffraction for crystal structure determination (space group I2/a).
- Temperature-dependent DC and AC magnetic susceptibility measurements.
- Specific heat measurements (Cp).
Main Results:
- CsNiV2O6Cl features vertex-sharing NiO4Cl2 octahedra and edge-sharing V5+O5 pyramids forming an open framework.
- DC magnetic susceptibility shows Haldane-type behavior with intrachain exchange J = 267 ± 16.5 K.
- Antiferromagnetic ordering observed at Neel temperature TN = 5.6 ± 0.2 K, attributed to defects/impurities.
- Calculated interchain interaction J' and single-ion anisotropy D place the system in the Haldane sector.
Conclusions:
- The crystal structure supports 1D magnetic chains responsible for Haldane-like behavior.
- Long-range antiferromagnetic order is induced by defects, not intrinsic to the ideal structure.
- CsNiV2O6Cl serves as a model system for studying defect-induced magnetism in low-dimensional materials.
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