Phonon-phonon interactions in Ce0.85Gd0.15O2-δ nanocrystals studied by Raman spectroscopy

被引：54

作者：

Askrabic, S. ^{[1
]}

Dohcevic-Mitrovic, Z. D. ^{[1
]}

Radovic, M. ^{[1
]}

Scepanovic, M. ^{[1
]}

Popovic, Z. V. ^{[1
]}

机构：

[1] Inst Phys, Ctr Solid State Phys & New Mat, Belgrade 11080, Serbia

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2009年 / 40卷 / 06期

关键词：

Gd-doped ceria; Raman scattering; phonon-phonon interaction; oxygen vacancies; OXIDE FUEL-CELLS; DOPED CERIA; ANHARMONIC DECAY; OPTICAL PHONONS; NANOPOWDERS; SCATTERING; CEO2; SPECTRA; NANOPARTICLES; 1ST-ORDER;

D O I：

10.1002/jrs.2177

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Phonon-phonon interactions and phase stability of Gd-doped ceria nanocrystals were examined over the temperature range 293-1100 K by Raman spectroscopy. The phonon confinement model (PCM) based on size, inhomogeneous strain and anharmonic effects was used to properly describe the anharmonic interactions in this system. The interplay between size and anharmonic effects influenced different phonon decay channels in nano grains than in larger grains. After the gradual cooling down to room temperature (RT), the Raman study revealed the phase separation in this system pointing to the phase instability of Ce0.85Gd0.15O2-delta nanocrystals after heat treatment. The concentration of extrinsic (intrinsic) oxygen vacancies was also studied by Raman spectroscopy during the heat treatment of the Ce0.85Gd0.15O2-delta nanocrystalline sample. Copyright (C) 2009 John Wiley & Sons, Ltd.

引用

页码：650 / 655

页数：6

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