High-pressure synthesis, spin-glass behaviour, and magnetocaloric effects in FexTi2S4 heideite sulphides

Intercalation compounds based on layered TiS2 sulphides are gaining much attention, since the incorporation of transition metals often dramatically change the physical properties and unlocks new intriguing phenomena. Here, we report a rapid high-pressure preparation method under 3.5 GPa at moderate...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-11, Vol.10 (42), p.15929-15940
Main Authors: Silva, R S, Gainza, J, Rodrigues, J E, Martínez, L, Céspedes, E, Nemes, N M, Martínez, J L, Alonso, J A
Format: Article
Language:English
Subjects:
Antiferromagnetism
Crystallography
Ferromagnetism
High pressure
Intercalation compounds
Iron
Magnetic properties
Metal sulfides
Neutron diffraction
Physical properties
Room temperature
Spin glasses
Synthesis
Titanium
Transition metals
Weiss field
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Summary:Intercalation compounds based on layered TiS2 sulphides are gaining much attention, since the incorporation of transition metals often dramatically change the physical properties and unlocks new intriguing phenomena. Here, we report a rapid high-pressure preparation method under 3.5 GPa at moderate temperatures for the synthesis of FexTi2S4 polycrystalline materials, starting from TiS2 and Fe metals. Three different compositions with x = 0.24, 0.32, and 0.42 have been stabilized at decreasing temperatures in the range of 800–900 °C; at room temperature, the crystallographic features have been probed by a neutron powder diffraction (NPD) experiment for the x = 0.42 sample. All the compounds crystallize in a Heideite-type phase with space group C12/m1; the structure consists of layers of [TiS6] octahedra sharing edges with Fe atoms located in between the layers, also in octahedral coordination. The NPD study unveils a discrete Fe/Ti inversion (
ISSN:2050-7526
2050-7534
DOI:10.1039/d2tc02160a