Transformation of the crystal structure of Ni 0.5 TiSe 2 under in situ heating

The crystal structure of the Ni TiSe compound has been studied in the temperature range of 25-1000 °C using synchrotron radiation X-ray diffraction. The previously known order-disorder transition in the Ni sublattice at ∼100 °C was found to be a second-order phase transition and belongs to the 3D Is...

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Published in:Physical chemistry chemical physics : PCCP 2024-05
Main Authors: Shkvarina, E G, Postnikov, M S, Merentsov, A I, Shkvarin, A S, Radzivonchik, D I, Gigli, L, Gaboardi, M, Plaisier, J R, Titov, A N
Format: Article
Language:English
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Summary:The crystal structure of the Ni TiSe compound has been studied in the temperature range of 25-1000 °C using synchrotron radiation X-ray diffraction. The previously known order-disorder transition in the Ni sublattice at ∼100 °C was found to be a second-order phase transition and belongs to the 3D Ising universality class. Reversible extraction of nickel selenides was observed in the temperature range of 275-975 °C. It was explained in terms of Ni extraction from Ni TiSe due to the thermal widening of the Ni 3d/Ti 3d/Se 4p impurity band. The Ni-TiSe phase diagram follows the typical pattern of M TiSe (M - transition metal) compounds.
ISSN:1463-9076
1463-9084
DOI:10.1039/D4CP00453A