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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Structural phase transitions and magnetic order in SrTcO_3
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Structural phase transitions and magnetic order in SrTcO_3

机译：SrTcO_3中的结构相变和磁序

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The structure of the perovskite SrTcO_3 has been investigated using both synchrotron X-ray and neutron powder diffraction. At room temperature SrTcO_3 is orthorhombic as a consequence of cooperative tilting of the corner sharing TcO6 octahedra. The tilts are sequentially removed as the sample is heated with the oxide displaying the sequence of structres Pnma → Imma → I4/mcm → Pm3m. Neutron powder diffraction data collected in the temperature range 4-1023 K indicate that SrTcO3 has G-type antiferromagnetic structure, in which each Tc moment is antiparallel to its six nearest neighbours, below ～1000 K. The magnetic structure is collinear antiferromagnetic with the technetium moments parallel to c-axis and can be described by the propagation vector k = [0,0,0] and the basis vector (0,0,Az). The same magnetic structure is observed in each of the four crystal structures.
机译：钙钛矿SrTcO_3的结构已使用同步加速器X射线和中子粉末衍射进行了研究。由于共享TcO6八面体的角的协同倾斜，在室温下SrTcO_3是正交的。当用氧化物加热样品时，倾斜被顺序除去，氧化物显示出结构顺序Pnma→Imma→I4 / mcm→Pm3m。在4-1023 K的温度范围内收集到的中子粉末衍射数据表明，SrTcO3具有G型反铁磁结构，其中每个Tc矩与其平行的六个最近的邻域都反平行，在〜1000 K以下。平行于c轴的力矩可以通过传播矢量k = [0,0,0]和基本矢量（0,0，Az）来描述。在四个晶体结构的每一个中观察到相同的磁性结构。

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