The ternary intermetallic compounds with general formula UTX (T = Fe, Co, Ni; X = Si, Ge) were analyzed by X-ray methods and some of their physical properties examined. All the studied phases belong to the well known TiNiSi-type structure. The compound UFeGe shows a phase transition at 500 K; at room temperature it crystallizes in a new monoclinic structure with a = 6.986, b = 4.308, c = 6.992 Å, β = 93.71° in the space group P21/m; above 500 K it changes into the orthorhombic TiNiSi-type. Electrical resistivity measurements were carried out in the range 1.5-300 K for all samples, and up to 600 K for UFeGe. Anomalies in the resistivity behaviour were detected for UNiSi, UFeGe, UCoGe and UNiGe at 19, 80, 46 and 41 K respectively and ascribed to magnetic transitions.
Structural and transport properties of some UTX compounds where T = Fe, Co, Ni and X = Si, Ge
CANEPA, FABIO MICHELE;MANFRINETTI, PIETRO;PANI, MARCELLA;PALENZONA, ANDREA
1996-01-01
Abstract
The ternary intermetallic compounds with general formula UTX (T = Fe, Co, Ni; X = Si, Ge) were analyzed by X-ray methods and some of their physical properties examined. All the studied phases belong to the well known TiNiSi-type structure. The compound UFeGe shows a phase transition at 500 K; at room temperature it crystallizes in a new monoclinic structure with a = 6.986, b = 4.308, c = 6.992 Å, β = 93.71° in the space group P21/m; above 500 K it changes into the orthorhombic TiNiSi-type. Electrical resistivity measurements were carried out in the range 1.5-300 K for all samples, and up to 600 K for UFeGe. Anomalies in the resistivity behaviour were detected for UNiSi, UFeGe, UCoGe and UNiGe at 19, 80, 46 and 41 K respectively and ascribed to magnetic transitions.
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