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2004
Rhodium
I 7900
44- 027
Crystal Structure and Magnetic Properties of the Trilayered Perovskite
Sr4Rh3O10: A New Member of the Strontium Rhodate Family. — The new title
compound is prepared by high-pressure, high-temperature reaction of SrO2, Rh2O3, and
Rh (6 GPa, 1500 °C). Powder neutron diffraction studies reveal an orthorhombic crystal structure (space group Pbam, Z = 4) at room temperature and 3.4 K. Local structure
distortions rotationally tilt the RhO6 octahedra ≈12° in the perovskite-based blocks
along the c-axis. The Sr4Rh 3O10 sample is further characterized by measurements of the
specific heat, thermopower, magnetic susceptibility, and electrical resistivity. The data
clearly reveal enhanced paramagnetism and electrically conducting character, which
reflected the nature of the correlated 4d5-electrons of Rh4+. However, no clear signs of
magnetic and electrical transitions are observed above 2 K and below 70 kOe, providing a remarkable contrast to the rich electronic phenomena for the corresponding ruthenate Sr4Ru 3O10. — (YAMAURA*, K.; HUANG, Q.; YOUNG, D. P.; TAKAYAMA-MUROMACHI, E.; Chem. Mater. 16 (2004) 18, 3424-3430; Supercond. Mater.
Cent., Natl. Inst. Mater. Sci., Tsukuba, Ibaraki 305, Japan; Eng.) — Schramke
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