Abstract
The hexagonal plate-like single crystals of a new compound PrRh4.8B2 were obtained by a molten metal flux growth method using Cu as a flux. PrRh4.8B2 is orthorhombic with the space group Fmmm; a=0.9697(4) nm, b=0.5577(2) nm and c=2.564(3)nm. The structure of the compound is of a modified CeCo3B2-type which is explained by a stacking model of Pr–B and rhodium layers. The temperature dependence of inverse static magnetic susceptibility, χ−1 obeys the Curie–Weiss law at higher temperature above 50 K. The μeff is 4.2 μB and Θp is −13 K. The value of the observed effective magnetic moment is larger than the value of 3.6 μB for the free trivalent ion Pr3+. The susceptibility deviates from the Curie–Weiss law, below 50 K, suggesting some magnetic ordering. The value of MVH for c-plane with the orthorhombic symmetry of PrRh4.8B2 is 6.7±0.6 GPa. The TG curve represents that oxidation of the PrRh4.8B2 proceeds above 600°C. Weight gain of the specimen heated up to 1200°C in air is 13%. After TG–DTA measurement, final product is PrBO3 and Rh.
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