Enhanced oxygen diffusivity in interfaces of nanocrystalline ZrO2•Y2O3

被引：108

作者：

Knöner, G

Reimann, K

Röwer, R

Södervall, U

Schaefer, HE

机构：

[1] Univ Stuttgart, Inst Theoret & Angew Phys, D-70550 Stuttgart, Germany

[2] Chalmers Univ Technol, Dept Microelect & Nanosci, S-41926 Gothenburg, Sweden

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2003年 / 100卷 / 07期

关键词：

D O I：

10.1073/pnas.0730783100

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

First measurements of oxygen grain boundary diffusion coefficients in nanocrystalline yttria-doped ZrO2 (n-ZrO2.6.9 mol % Y2O3) are presented. The O-18 diffusion profiles measured by secondary ion mass spectroscopy are much deeper in the nanocrystalline specimens than in single crystals. An oxygen diffusivity, D-B, in the grain boundaries can be deduced, which is approximate to3 orders of magnitude higher than in single crystals. From the present data the temperature variation of the oxygen grain boundary diffusivity, D-B = 2.0 x 10(-5) exp (-0.91 eV/k(B)T) m(2)/s, and the oxygen surface exchange coefficient, k = 1.4 x 10(-2) exp (-1.13 eV/k(B)T) m/s, are derived.

引用

页码：3870 / 3873

页数：4

共 30 条

[11] PHYSICAL ORIGIN OF THE INTRINSIC GRAIN-BOUNDARY RESISTIVITY OF STABILIZED-ZIRCONIA - ROLE OF THE SPACE-CHARGE LAYERS [J].