CAS OpenIR  > 中科院上海应用物理研究所2011-2020年
Pressure-Induced Phase Transformations of Zircon-Type LaVO4 Nanorods
Yuan, HS; Wang, K; Wang, C; Zhou, B; Yang, K; Liu, J; Zou, B
AbstractA combination of synchrotron powder X-ray diffraction (XRD) and Raman spectroscopy has been used to study high-pressure behavior of the zircon-type LaVO4 nanorods. In situ high-pressure XRD results identified an irreversible zircon-to-monazite phase transition at similar to 5 GPa and a reversible transition to an undetermined second high-pressure phase (phase III) at similar to 12.9 GPa. Through Le Bail refinements of the XRD patterns with zircon-type structure, we show that the zircon-type LaVO4 nanorods possess the smallest bulk modulus among zircon-type rare-earth orthovanadates. Furthermore, negative pressure coefficients of external translational T(Eg) and internal upsilon(2)(B-2g) bending modes have been observed in Raman measurements. The Raman spectra of phase III with distinctive features have been fully recorded for the first time, and a related structure associated with a coordination increase for V is suggested in terms of the postmonazite phase in LaVO4 nanorods. Finally, analysis of the transmission electron microscopy both before and after compression indicates that a large number of nanorods can be recovered in the quenched samples, allowing us to verify the orientation relationship for zircon-to-monazite phase transformation.
KeywordX-ray-diffraction Structural Transformation Lanthanum Orthovanadate Crystal-structures Raman-scattering Ab-initio Transition Stability Monazite Compressibility
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Document Type期刊论文
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GB/T 7714
Yuan, HS,Wang, K,Wang, C,et al. Pressure-Induced Phase Transformations of Zircon-Type LaVO4 Nanorods[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(15):8364—8372.
APA Yuan, HS.,Wang, K.,Wang, C.,Zhou, B.,Yang, K.,...&Zou, B.(2015).Pressure-Induced Phase Transformations of Zircon-Type LaVO4 Nanorods.JOURNAL OF PHYSICAL CHEMISTRY C,119(15),8364—8372.
MLA Yuan, HS,et al."Pressure-Induced Phase Transformations of Zircon-Type LaVO4 Nanorods".JOURNAL OF PHYSICAL CHEMISTRY C 119.15(2015):8364—8372.
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