Self-diffusion in high-purity α-Al2O3: Comparison of Ti-doped, Mg-doped and undoped single crystals
Self-diffusion in high-purity α-Al2O3: Comparison of Ti-doped, Mg-doped and undoped single crystals
复制标题
高纯α-Al2O3 中的自扩散:Ti 掺杂、Mg 掺杂和未掺杂单晶的比较
DOI:
10.1016/j.jeurceramsoc.2020.07.064
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发表时间:
2020
影响因子:
5.7
通讯作者:
G. Borchardt
中科院分区:
文献类型:
--
作者:
P. Fielitz;S. Ganschow;K. Kelm;G. Borchardt
Oxygen diffusivity in α-alumina is characterised by a scatter band of about one decade and a half in an Arrhenius diagram. In order to control decisive material parameters the present study is based on high-purity single crystals which were deliberately doped with aliovalent elements (Mg or Ti) and simultaneously annealed in an18O2atmosphere (200 mbar at 1650 °C). In such a crucial experiment the diffusivities in undoped and acceptor or donor doped alumina are identical within a factor of about 2. Contradictory findings in the past on the impact of Mg and Ti on the oxygen diffusion can be rationalised due to published similar calculated energies for the most probable dopant incorporation reactions. Al self-diffusion is much more rapid than oxygen diffusion in undoped and Ti-doped α-alumina. In this work we show for the first time that Mg doping drastically reduces the Al diffusivity in α-alumina.
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影响因子:
9.4
作者:
P. Fielitz;S. Ganschow;K. Kelm;G. Borchardt
通讯作者:
G. Borchardt
DOI:
10.4028/www.scientific.net/df.8.80
发表时间:
2016-07
期刊:
Diffusion Foundations
影响因子:
--
作者:
P. Fielitz;G. Borchardt
通讯作者:
P. Fielitz;G. Borchardt
影响因子:
--
作者:
J. M. Ferguson
通讯作者:
J. M. Ferguson
影响因子:
--
作者:
P. Fielitz;G. Borchardt;S. Ganschow;R. Bertram
通讯作者:
P. Fielitz;G. Borchardt;S. Ganschow;R. Bertram
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
G. Keig
通讯作者:
G. Keig