Lee, Kyung-Ryul Ahn, Kiyong Chung, Yong-Chae Lee, Jong-Ho Yoo, Han-Ill 2024-01-20T13:30:38Z 2024-01-20T13:30:38Z 2021-09-04 2012-12-14 0167-2738 https://pubs.kist.re.kr/handle/201004/128547 The effect of mechanical strain on the electrical properties of Gd-doped CeO2 (GDC) thin films, which was induced by the structural change in the crystalline lattice, was investigated through microstructural and electrical characterization of the GDC films. The electrical conductivity was measured on GDC films grown epitaxially in the < 111 > direction on the (0001) surface of sapphire, as a functions of the film thickness in the range 52-403 nm and temperature in the range 500-700 degrees C. It was found that the activation energy decreases from 1.06 to 0.69 eV with increasing thickness. It is attributed to the in-plane compressive stress which originated from the lattice mismatch at the film-substrate interface. From the atomic scale simulation with ab-initio method we found that the activation energy for oxide ion migration was closely correlated with the distortion of crystalline lattice. Here we also suggested proper oxygen migration model under anisotropic lattice distortion which can explain the variation of activation energy for the oxide ion transport with respect to anisotropic strain in ceria lattice. (C) 2012 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV YTTRIA-STABILIZED ZIRCONIA POLYCRYSTALLINE CERIUM OXIDE ENHANCED IONIC-CONDUCTIVITY DOPED CERIA ELECTROCHEMICAL PROPERTIES NANOCRYSTALLINE CERIA SELF-DIFFUSION PRESSURE DEFECT CEO2 Lattice distortion effect on electrical properties of GDC thin films: Experimental evidence and computational simulation Article 10.1016/j.ssi.2012.10.007 1 SOLID STATE IONICS, v.229, pp.45 - 53 SOLID STATE IONICS 229 45 53 scie scopus 000313091500008 2-s2.0-84868506679 Chemistry, Physical Physics, Condensed Matter Chemistry Physics Article YTTRIA-STABILIZED ZIRCONIA POLYCRYSTALLINE CERIUM OXIDE ENHANCED IONIC-CONDUCTIVITY DOPED CERIA ELECTROCHEMICAL PROPERTIES NANOCRYSTALLINE CERIA SELF-DIFFUSION PRESSURE DEFECT CEO2 Thin film GDC Strain Electrical conductivity Activation energy Ab-initio calculation