中国物理B ›› 2013, Vol. 22 ›› Issue (5): 59101-059101.doi: 10.1088/1674-1056/22/5/059101

• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇    下一篇

In-situ high-pressure behaviors of double-perovskite Sr2ZnTeO6

韩丹丹, 高伟, 李娜娜, 唐瑞莲, 李会, 马艳梅, 崔启良, 朱品文, 王欣   

  1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
  • 收稿日期:2012-09-19 修回日期:2012-10-23 出版日期:2013-04-01 发布日期:2013-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51172091), the Program for New Century Excellent Talents in University, China, and the National Fund for Fostering Talents of Basic Science, China (Grant No. J1103202).

In-situ high-pressure behaviors of double-perovskite Sr2ZnTeO6

Han Dan-Dan (韩丹丹), Gao Wei (高伟), Li Na-Na (李娜娜), Tang Rui-Lian (唐瑞莲), Li Hui (李会), Ma Yan-Mei (马艳梅), Cui Qi-Liang (崔启良), Zhu Pin-Wen (朱品文), Wang Xin (王欣)   

  1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
  • Received:2012-09-19 Revised:2012-10-23 Online:2013-04-01 Published:2013-04-01
  • Contact: Zhu Pin-Wen, Wang Xin E-mail:zhupw@jlu.edu.cn; Xin Wang@jlu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51172091), the Program for New Century Excellent Talents in University, China, and the National Fund for Fostering Talents of Basic Science, China (Grant No. J1103202).

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摘要： Structural and spectroscopic properties of Sr2ZnTeO6 (SZTO) were investigated by angle-dispersive synchrotron X-ray powder diffraction and Raman spectroscopy in a diamond anvil cell up to 31 GPa at room temperature. Although SZTO remained stable up to the highest pressure, the different pressure coefficients of the normalized axial compressibility were obtained as βab=8.16×10-3 GPa-1 and βc=7.61×10-3 GPa-1. The bulk modulus B0 was determined to be 190(1) GPa by fitting the pressure-volume data using the Birch-Murnaghan equation of state. All the observed Raman modes exhibited a broadening effect under high pressure. The vibrational band ϒ 1 around 765 cm-1, which is associated with the Te-O stretching mode in the basal plane of the TeO6 octahedron, had the largest pressure coefficient, and the Grüneisen parameters for all the observed phonon modes also were calculated and presented. These parameters could be used to measure the amount of uniaxial or biaxial strain, providing a fundamental tool for monitoring the magnitude of the shift of phonon frequencies with strains.

关键词: crystal structure, high pressure, X-ray diffraction, optical spectroscopy

Abstract: Structural and spectroscopic properties of Sr2ZnTeO6 (SZTO) were investigated by angle-dispersive synchrotron X-ray powder diffraction and Raman spectroscopy in a diamond anvil cell up to 31 GPa at room temperature. Although SZTO remained stable up to the highest pressure, the different pressure coefficients of the normalized axial compressibility were obtained as βab=8.16×10-3 GPa-1 and βc=7.61×10-3 GPa-1. The bulk modulus B0 was determined to be 190(1) GPa by fitting the pressure-volume data using the Birch-Murnaghan equation of state. All the observed Raman modes exhibited a broadening effect under high pressure. The vibrational band ϒ 1 around 765 cm-1, which is associated with the Te-O stretching mode in the basal plane of the TeO6 octahedron, had the largest pressure coefficient, and the Grüneisen parameters for all the observed phonon modes also were calculated and presented. These parameters could be used to measure the amount of uniaxial or biaxial strain, providing a fundamental tool for monitoring the magnitude of the shift of phonon frequencies with strains.

Key words: crystal structure, high pressure, X-ray diffraction, optical spectroscopy

中图分类号:  (High-pressure behavior)

  • 91.60.Gf
61.05.cp (X-ray diffraction) 61.50.-f (Structure of bulk crystals)