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

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

Abstract

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).

Keywords: lanthanum silicates structural evolution interstitial oxygen atoms compressibility

Received: 28 July 2017
Revised: 06 September 2017
Accepted manuscript online:

PACS:	82.45.Gj	(Electrolytes)
	61.05.cp	(X-ray diffraction)
	81.40.Vw	(Pressure treatment)

Fund:

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).

Corresponding Authors: Wei Gao
E-mail: gwei@jlu.edu.cn

Cite this article:

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 2018 Chin. Phys. B 27 018202

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

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