Abstract
X-ray powder diffraction patterns of BaRu4As12 with synchrotron radiation have been studied at ambient pressure and at high pressures. A crystal structure of BaRu4As12 was refined by the Rietveld analysis of the x-ray powder diffraction data at ambient pressure. The electrical property of BaRu4As12 have been studied at low temperature. This arsenide shows the metallic behavior. The volume vs. pressure curve for this arsenide has in detail been investigated at room temperature. The cell volume of BaRu4As12 decreased smoothly with increasing pressure up to 10 GPa. A bulk modulus was estimated from the volume vs. pressure curve fitted by a Birch equation of state. The bulk modulus (B0) and its pressure derivative (B0') of BaRu4As12 are 127.0(2) GPa and 5.2(4), respectively. The value of B0 for this arsenide is the same as that of CeRu4As12, smaller than that of LaRu4As12.
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