Pressure-induced structural evolution of apatite-type La9.33Si6O26

doi:10.1088/1674-1056/27/1/018202

中国物理B ›› 2018, Vol. 27 ›› Issue (1): 18202-018202.doi: 10.1088/1674-1056/27/1/018202

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆

Guangchao Yin(尹广超), Hong Yin(殷红), Meiling Sun(孙美玲), Wei Gao(高伟)

1 Functional Molecular Materials Laboratory, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China;
2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

收稿日期:2017-07-28 修回日期:2017-09-06 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: Wei Gao E-mail:gwei@jlu.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2015AQ010 and ZR2016FB16) and the Open Project Fund of State Key Laboratory of Superhard Materials of China (Grant No. 201509).

Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆

Guangchao Yin(尹广超)¹, Hong Yin(殷红)², Meiling Sun(孙美玲)¹, Wei Gao(高伟)²

1 Functional Molecular Materials Laboratory, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China;
2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

Received:2017-07-28 Revised:2017-09-06 Online:2018-01-05 Published:2018-01-05
Contact: Wei Gao E-mail:gwei@jlu.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2015AQ010 and ZR2016FB16) and the Open Project Fund of State Key Laboratory of Superhard Materials of China (Grant No. 201509).

摘要/Abstract

摘要：

The pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆ was systematically studied using in situ synchrotron x-ray diffraction (XRD). The XRD spectra indicated that a subtly reversible phase transition from P6₃/m to P6₃ symmetry occurred at~13.6 GPa because of the tilting of the SiO₄ tetrahedra under compression. Furthermore, the La_9.33Si₆O₂₆ exhibited a higher axial compression ratio for the a-axis than the c-axis, owing to the different axial arrangement of the SiO₄ tetrahedra. Interestingly, the high-pressure phase showed compressibility unusually higher than that of the initial phase, suggesting that the low P6₃ symmetry provided more degrees of freedom. Moreover, the La_9.33Si₆O₂₆ exhibited a lower phase transition pressure (P_T) and a higher lattice compression than La₁₀Si₆O₂₇. Comparisons between La_9.33Si₆O₂₆ and La₁₀Si₆O₂₇ provided a deeper understanding of the effect of interstitial oxygen atoms on the structural evolution of apatite-type lanthanum silicates (ATLSs).

关键词: lanthanum silicates, structural evolution, interstitial oxygen atoms, compressibility

Abstract:

Key words: lanthanum silicates, structural evolution, interstitial oxygen atoms, compressibility

中图分类号: (Electrolytes)

82.45.Gj

61.05.cp (X-ray diffraction) 81.40.Vw (Pressure treatment)

尹广超, 殷红, 孙美玲, 高伟. Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆[J]. 中国物理B, 2018, 27(1): 18202-018202.

Guangchao Yin(尹广超), Hong Yin(殷红), Meiling Sun(孙美玲), Wei Gao(高伟). Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆[J]. Chin. Phys. B, 2018, 27(1): 18202-018202.

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Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆

Pressure-induced structural evolution of apatite-type La_9.33Si₆O₂₆

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