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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Structural and magnetic properties of the ordered perovskite Pb _2CoTeO_6
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Structural and magnetic properties of the ordered perovskite Pb _2CoTeO_6

机译：有序钙钛矿Pb _2CoTeO_6的结构和磁性

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摘要

The complex perovskite Pb_2CoTeO_6 (PCTO) has been prepared as polycrystalline powders by a solid state reaction route, and the crystal structure and magnetic properties have been investigated using a combination of X-ray and neutron powder diffraction, electron microscopy, dielectric, calorimetric and magnetic measurements. It was shown that at room temperature this compound adopts a trigonal perovskite structure, space group R3 (a = 5.6782(1) ?, c = 13.8552(3) ?). The compound undergoes a number of temperature-induced phase transitions and adopts four different structures in the temperature range 5-500 K: monoclinic in P2_1 (5 < T < 125 K, tilt system (a~+b~-b~-)), monoclinic in I2/m (125 < T < 210 K, tilt system (a~0b ~-b~-)), rhombohedral in R3 (210 < T < 370 K, tilt system (a~-a~-a~-)), and finally cubic in Fm3m (above 370 K without any tilting). These structural phase transitions are coupled to changes in the dielectric constant and the heat capacity around 210 and 370 K. A long-range antiferromagnetically ordered state has been identified from neutron powder diffraction and magnetic studies at different temperatures. Magnetic diffraction peaks were registered below the transition at about 16 K and a possible model for the magnetic structure is proposed. Possible coexistence of long-range ordering of the electrical dipoles and the magnetic moments at low temperatures making PCTO a potential multiferroic candidate is discussed.
机译：通过固相反应路线制备了复合钙钛矿Pb_2CoTeO_6（PCTO）多晶粉末，并通过X射线和中子粉末衍射，电子显微镜，介电，量热和磁学方法研究了晶体结构和磁性能测量。结果表明，该化合物在室温下采用三角形钙钛矿结构，空间群R3（a = 5.6782（1），c = 13.8552（3））。该化合物经历了许多温度诱导的相变，并在5-500 K的温度范围内采用四种不同的结构：P2_1 / n（5

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