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Yttrium, an Isoelectric Donor in α ‐ Al 2 O 3
Author(s) -
ELAIAT M. M.,
KRöGER F. A.
Publication year - 1982
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1982.tb10444.x
Subject(s) - yttrium , crystallite , electrical resistivity and conductivity , doping , ion , diffusion , analytical chemistry (journal) , aluminium , activation energy , materials science , chemistry , inorganic chemistry , metallurgy , thermodynamics , physics , optoelectronics , organic chemistry , chromatography , oxide , electrical engineering , engineering
Measurements of dc electrical conductivity and emf of single crystal and polycrystalline α‐Al 2 O 3 doped, respectively, with 100 and 300 ppm yttrium show that yttrium, although isoelectronic with aluminum, is a donor. The electronic energy level of the donor is attributed to O 2‐ next to Y 3+ , its level being forced up as a result of the large size of the yttrium ion. The donor activity of Y supports the view that the favorable effect of Y on the oxidation of super alloys is due to reduced diffusion of Al in the bulk through a reduced concentration of Al i … without a marked increase in the concentration of V … Al .