气候变化领域集成服务门户(CCPortal): Pressure-induced order-disorder transition in Gd1.5Ce0.5Ti2O7 pyrochlore

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DOI	10.1098/rsos.190842
	Pressure-induced order-disorder transition in Gd1.5Ce0.5Ti2O7 pyrochlore
	Niu, Jingjing; Wu, Xiang; Zhang, Haibin; Qin, Shan
通讯作者	Niu, JJ (通讯作者)
发表日期	2019
ISSN	2054-5703
卷号	6 期号:9
英文摘要	An experimental study on ordered pyrochlore structured Gd1.5Ce0.5Ti2O7 (Fd3m) was carried out up to 45 GPa by synchrotron radiation X-ray diffraction and Raman spectroscopy. Experimental results show that Gd1.5Ce0.5Ti2O7 transfers to a disordered cotunnite-like phase (Pnma Z = 4) at approximately 42 GPa. Compared with the end member Gd2Ti2O7, the substitution of Ce3+ for Gd3+ increases the transition pressure and the high-pressure stability of the pyrochlore phase. This pressure-induced structure transition is mainly controlled by cationic order-disorder modification, and the cationic radius ratio r(A)/r(B) may also be effective for predicting the pyrochlore oxides' high-pressure stability. Two isostructural transitions are observed at 6.5 GPa and 13 GPa, and the unit-cell volume of Gd1.5Ce0.5Ti2O7 as a function of pressure demonstrates its compression behaviour is rather complex.
关键词	RARE-EARTH TITANATES GD
英文关键词	pyrochlore; order-disorder phase transition; high pressure
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000488745800039
来源期刊	ROYAL SOCIETY OPEN SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259558
推荐引用方式 GB/T 7714	Niu, Jingjing,Wu, Xiang,Zhang, Haibin,et al. Pressure-induced order-disorder transition in Gd1.5Ce0.5Ti2O7 pyrochlore[J]. 中国科学院青藏高原研究所,2019,6(9).
APA	Niu, Jingjing,Wu, Xiang,Zhang, Haibin,&Qin, Shan.(2019).Pressure-induced order-disorder transition in Gd1.5Ce0.5Ti2O7 pyrochlore.ROYAL SOCIETY OPEN SCIENCE,6(9).
MLA	Niu, Jingjing,et al."Pressure-induced order-disorder transition in Gd1.5Ce0.5Ti2O7 pyrochlore".ROYAL SOCIETY OPEN SCIENCE 6.9(2019).