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首页> 外文期刊>Physical review >Phase stability and magnetic behavior of hexagonal phase of N_2-O_2 system with kagome lattice under high pressure and low temperature
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Phase stability and magnetic behavior of hexagonal phase of N_2-O_2 system with kagome lattice under high pressure and low temperature

机译：高压和低温下具有Kagome晶格的N_2-O_2体系六方相的相稳定性和磁性

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摘要

The pressure-temperature (P-T) phase diagram of N_2-O_2 mixture with a composition of N_2-48 mol % O_2 has been investigated using x-ray diffraction and the phase stability of a hexagonal phase (space group: P6/mmm), with the kagome lattice examined under high-pressure and low-temperature conditions. While the phase appears as a low-temperature phase of the cubic phase (Pm3n) with the structure of γ-O_2 or δ-N_2 and is stable in a wide range of pressures and temperatures, it transforms to lower symmetry monoclinic or orthorhombic phases at lower temperature, accompanied with a distortion of the kagome lattice. Based on Rietveld refinements, the monoclinic and orthorhombic phases are found to be in the P2_1/a and Cmmm space groups, respectively. In magnetization measurements, a magnetic transition is observed with a relatively large drop of magnetization, corresponding to the cubic-to-hexagonal phase transition. This suggests that the hexagonal phase has a certain magnetic ordered state that arises from the molecular magnetic moment of O_2.
机译：用X射线衍射研究了N_2-O_2组成为N_2-48 mol％O_2的N_2-O_2混合物的压力-温度（PT）相图，以及六方相（空间群：P6 / mmm）的相稳定性。在高压和低温条件下检查的kagome晶格。虽然该相为立方相（Pm3n）的低温相，具有γ-O_2或δ-N_2的结构，并且在很宽的压力和温度范围内都是稳定的，但在相变时转变为较低对称的单斜晶或正交晶相较低的温度，伴随着kagome晶格的变形。基于Rietveld改进，发现单斜相和正交相分别位于P2_1 / a和Cmmm空间群中。在磁化测量中，观察到磁化转变具有相对较大的磁化强度下降，这对应于立方到六方的相变。这表明六方相具有由O_2的分子磁矩引起的一定的磁有序状态。

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  • 来源
    《Physical review》 |2016年第6期|064104.1-064104.6|共6页
  • 作者

    Y. Akahama; D. Ishihara; H. Yamashita; H. Fujihisa; N. Hirao; Y. Ohishi;

  • 作者单位

    Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Hyogo 678-1297, Japan;

    Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Hyogo 678-1297, Japan;

    Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Hyogo 678-1297, Japan;

    National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan;

    Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Sayo-gun, Hyogo 679-5198, Japan;

    Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Sayo-gun, Hyogo 679-5198, Japan;

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