Investigation of the lattice behavior of cubic Y₂O₃/Eu³⁺ nanotubes under high pressure

Abstract

In situ Raman vibration characterization and angle-dispersive X-ray diffraction (ADXD) measurements were performed on Y 2 O 3 /Eu 3þ nanotubes to study its lattice change behavior under high pressure. The Raman vibration and lattice reflection both show changes in behavior near 8-10 GPa. The lattice of the cubic structure of Y 2 O 3 /Eu 3þ nanotubes exhibits two different lattice states related to forms of the micro local atom arrangement. The lattice states resulted from the local disorder of the lattice due to pressure-induced deformation of the YO 6 octahedra under the high pressure.

Size-Dependent High-Pressure Behavior of Pure and Eu3+-Doped Y2O3 Nanoparticles: Insights from Experimental and Theoretical Investigations

“…Nanoparticles with an average particle size of ~37 nm show the same pressure-induced phase transition (PT) sequence (C-B-A) on upstroke and (A-B) downstroke as the bulk sample [ 19 ]. This is in contrast with what has been published in many previous works [ 20 , 21 , 22 , 23 , 24 , 25 ]. On the other hand, nanoparticles with an average particle size of ~6 nm undergo an irreversible pressure-induced amorphization (PIA) starting above 16 GPa, with full amorphization observed above 24 GPa.…”

Local microstructural analysis for Y 2 O 3 /Eu 3+ /Mg 2+ nanorods by Raman and photoluminescence spectra under high pressure

“…This observation is ascribed to the pressure-induced YO 6 octahedron distortion. [22] We plot the pressure-dependent Raman peak position in Fig. 4.…”

“…As previously reported, the different changes in behavior of the Raman vibration slope under pressure correspond to different lattice states that exist before structure transformation. [22] The latter lattice state is thought of as a slightly distorted state that results from the YO 6 octahedron distortion. The weakened Raman intensity mentioned previously is caused by a local distortion of the Y 2 O 3 lattice.…”

“…[19,[23][24][25][26][27][28] Investigations aiming to study the pressure-dependent photoluminescence (PL) spectra of both Y 2 O 3 /Eu 3+ bulk and nano-materials by using either 514.5-nm or 532-nm laser excitation reported red spectral shifts and a loss of PL peaks. [20,[22][23][24][25][26][27][28] In our recent study, we demonstrated the probe effect of up-conversion PL measurement in revealing slight changes of YO 6 octahedron in Y 2 O 3 /Eu 3+ nanotubes under high pressure. [19] However, currently, there are no studies to analyze the pressure behavior of the luminescence of Y 2 O 3 /Eu 3+ nanomaterials by manipulating other auxiliary ions under high pressure.…”

“…[18][19][20][21] In the case of Y 2 O 3 (Eu 3+ ) nanomaterial, pressure-induced microstructural deformation ahead of the lattice amorphous transition results in completely distinct microstructural states for doping Eu 3+ ions. [22] This clearly results in a change in crystal environment, which subsequently changes the local environment of Eu 3+ ions. In addition, other doping ions cause a nonhomogeneous distortion of the microstructure, which is amplified under high pressure due to lattice compression.…”