中国物理B ›› 2012, Vol. 21 ›› Issue (6): 66102-066102.doi: 10.1088/1674-1056/21/6/066102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

The crystal structures and physical properties of the solid solution compound Ba5Y8-xMn4O21-1.5x (x=0, 1)

高庆庆, 李静波, 宋士佳, 骆军, 饶光辉, 梁敬魁   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2011-12-21 修回日期:2012-02-09 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148 and 51072225) and the National Basic Research Program of China (Grant No. 2007CB925003).

The crystal structures and physical properties of the solid solution compound Ba5Y8-xMn4O21-1.5x (x=0, 1)

Gao Qing-Qing(高庆庆), Li Jing-Bo(李静波)†, Song Shi-Jia(宋士佳), Rao Guang-Hui(饶光辉), Luo Jun(骆军), Liu GuangYao(刘广耀), and Liang Jing-Kui(梁敬魁)‡   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190, China
  • Received:2011-12-21 Revised:2012-02-09 Online:2012-05-01 Published:2012-05-01
  • Contact: Li Jing-Bo, Liang Jing-Kui E-mail:jbli@iphy.ac.cn; jkliang@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148 and 51072225) and the National Basic Research Program of China (Grant No. 2007CB925003).

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摘要： New oxometallides with the formula Ba5Y8-xMn4O21-1.5x (x=0, 1) are prepared through an atmosphere-controlled solid-state reaction. Two single-phase samples with Ba/Y/Mn atomic ratios 5/8/4 (Y8) and 5/7/4 (Y7) are obtained. The crystal structures and the physical properties of the compounds are investigated by X-ray powder diffraction, magnetization, conductivity, and dielectricity measurements. The Ba5Y8-xMn4O21-1.5x compound is demonstrated to be a Y-deficient solid solution. The solid solution compound Ba5Y8-xMn4O21-1.5x crystallizes into tetragonal symmetry with the space group I4/m. Detailed structure analysis by Rietveld refinement of the X-ray powder diffraction data reveals that the Y vacancies occur preferentially at the Y(2) site. Thermal magnetization measurements indicate the presence of antiferromagnetic interaction between Mn ions in the compounds, and temperature-dependent resistivity measurements show that insulator-semiconductor transitions occur around 175 K and 170 K for the Y8 and Y7 samples, respectively. Strong frequency dependences of the dielectric constant are observed above ～ 175 K for the two compounds.

关键词: Ba5Y8-xMn4O21-1.5x, X-ray powder diffraction, crystal structure, conductivity

Abstract: New oxometallides with the formula Ba5Y8-xMn4O21-1.5x (x=0, 1) are prepared through an atmosphere-controlled solid-state reaction. Two single-phase samples with Ba/Y/Mn atomic ratios 5/8/4 (Y8) and 5/7/4 (Y7) are obtained. The crystal structures and the physical properties of the compounds are investigated by X-ray powder diffraction, magnetization, conductivity, and dielectricity measurements. The Ba5Y8-xMn4O21-1.5x compound is demonstrated to be a Y-deficient solid solution. The solid solution compound Ba5Y8-xMn4O21-1.5x crystallizes into tetragonal symmetry with the space group I4/m. Detailed structure analysis by Rietveld refinement of the X-ray powder diffraction data reveals that the Y vacancies occur preferentially at the Y(2) site. Thermal magnetization measurements indicate the presence of antiferromagnetic interaction between Mn ions in the compounds, and temperature-dependent resistivity measurements show that insulator-semiconductor transitions occur around 175 K and 170 K for the Y8 and Y7 samples, respectively. Strong frequency dependences of the dielectric constant are observed above ～ 175 K for the two compounds.

Key words: Ba5Y8-xMn4O21-1.5x, X-ray powder diffraction, crystal structure, conductivity

中图分类号:  (X-ray diffraction)

  • 61.05.cp
91.60.Ed (Crystal structure and defects, microstructure) 72.20.-i (Conductivity phenomena in semiconductors and insulators)