Structural and Magnetic Properties of the Iridium Double Perovskites Ba2鈥搙SrxYIrO6

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• 作者：Ben Ranjbar ; Emily Reynolds ; Paula Kayser ; Brendan J. Kennedy James R. Hester ; Justin A. Kimpton
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：54
• 期：21
• 页码：10468-10476
• 全文大小：572K
• ISSN：1520-510X

文摘

The crystal structures of the series of ordered double perovskites Ba_2鈥?i>xSr_xYIrO₆ (0 鈮?x 鈮?2) were refined using a combination of high-resolution synchrotron X-ray and high-intensity neutron diffraction data. The materials displayed a sequence of structures Fm3虆m(a⁰a⁰a⁰) I4/m(a⁰a⁰c^{鈥?/sup>) I2/m(a鈥?/sup>a鈥?/sup>c0) P2₁/n(a鈥?/sup>a鈥?/sup>c+) associated with increased tilting of the corner-sharing octahedra induced by increasing amount of the smaller Sr cation present. A similar sequence of transitions was induced by heating selected samples. Magnetic susceptibility measurements between 2 and 300 K showed no evidence for long-range magnetic ordering, an observation that was supported by neutron diffraction measurements, and rather strong spin鈥搊rbit coupling results in a J_eff = 0 ground state.}