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Ti8(Ti(x)Mn(1-x))6Mn39 ('TiMn(~4)'): a metallic spin fluctuation system
Atta U Khan1, G Rogl, M Kriegisch
1Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, A-1090 Wien, Austria.
The crystal structure of TiMn(~4) was determined, revealing it as a metallic spin fluctuation system. Anomalies suggest spin freezing phenomena occur around 10 K in this titanium-manganese compound.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- The R-phase, a complex intermetallic compound, has a known crystal structure.
- Titanium-manganese (Ti-Mn) alloys are of interest for their potential magnetic properties.
Purpose of the Study:
- To determine the crystal structure and homogeneity region of the TiMn(~4) phase.
- To investigate the physical properties of TiMn(~4) and characterize its magnetic behavior.
Main Methods:
- X-ray single-crystal diffraction was used to determine the crystal structure.
- Electron probe micro-analysis (EPMA) was employed to establish the homogeneity region.
- Heat capacity and magnetization measurements were performed from ~2 K to room temperature.
Main Results:
- The crystal structure was confirmed to be rhombohedral, isotypic with the R-phase.
- The homogeneity region for TiMn(~4) was found to be between 16.0 and 20 at.% Ti for temperatures between 800 °C and 1200 °C.
- TiMn(4.26) exhibits characteristics of a metallic spin fluctuation system, with a T(3)lnT heat capacity dependence and a large Sommerfeld constant (140 mJ mol(-1) K(-2)).
- A heat capacity and magnetization anomaly around 10 K indicates spin freezing phenomena.
Conclusions:
- The TiMn(~4) phase crystallizes in the R-phase structure.
- The compound behaves as a metallic spin fluctuation system with evidence of spin freezing at low temperatures.
- The study provides insights into the structural and magnetic properties of titanium-manganese intermetallics.
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