ESR centers in reduced stabilized zirconia.
ESR centers in reduced stabilized zirconia.
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DOI：
10.1103/physrevb.43.7395
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发表时间：
1991-04
期刊：
影响因子：
--
通讯作者：
Ben-Michael;Tannhauser;Genossar
中科院分区：
文献类型：
--
作者：
Ben-Michael;Tannhauser;Genossar
Stabilized zirconia, when exposed at high temperature to a reducing atmosphere, becomes colored, and a pronounced room-temperature ESR signal appears. The concentration of the color centers was determined by optical absorption in the uv--visible range, and the concentration of the paramagnetic centers was determined by electron paramagnetic resonance in the {ital X} band. We found that the concentrations of the centers causing the two effects have the same {ital P}(O{sub 2}){sup {minus}1/4} dependence on the oxygen pressure, a dependence that agrees with a simple model; however, the ESR signal varies strongly from crystal to crystal. We conclude from these results that both effects are caused by the same center, most probably an impurity with a total concentration of 10{sup {minus}3} mol, which has captured an electron. From the ESR results the level of this electron state is {congruent}1.60 eV below the conduction band. The oscillator strength for optical absorption was found to be {ital f}{sub {ital O}}{congruent}0.01.
