Competing redox reactions in Fe-containing AlO(OH) and Al2O3 matrices: A combined investigation by Mössbauer, ESR spectroscopy and thermal analysis
Competing redox reactions in Fe-containing AlO(OH) and Al2O3 matrices: A combined investigation by Mössbauer, ESR spectroscopy and thermal analysis
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含 Fe AlO(OH) 和 Al2O3 基质中的竞争氧化还原反应：穆斯堡尔、ESR 光谱和热分析的联合研究
DOI：
10.1088/1742-6596/217/1/012028
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
F. Renz
中科院分区：
文献类型：
--
作者：
R. Stößer;M. Menzel;M. Feist;M. Nofz;F. Renz
对掺铁AlO(OH)/Al_2O_3体系的研究表明，穆斯堡尔谱和ESR谱与热分析相结合产生了具有补充信息的有意义的数据。这种互补性是基于Fe点缺陷与相应的聚集FeOx物种的共存，即使在很低的Fe浓度下也观察到了这一点。在热处理过程中，掺杂剂、AlOx基质和气体气氛之间的竞争氧化还原过程使固相的生成显示出特定的化学性质。整个反应过程受特定的机械和热前处理的影响，这主要影响基质中的氧化过程。确定了基质的保护作用，防止了Fe3+Fe2+离子被氢进一步还原攻击。
The investigation of iron-doped AlO (OH)/Al 2 O 3 systems revealed that the combined employment of Mössbauer and ESR spectroscopies together with thermal analysis yields meaningful data with complementary information. This mutual complementarity is based on the coexistence of Fe point defects with the corresponding aggregated FeO x species which has been observed even for very low Fe concentrations. Competing redox processes between the dopant, the AlO x matrix, and the gas atmosphere during the thermal treatment enable the generation of solid phases exhibiting specific chemical properties. The entire reaction process is influenced by a specific mechanical and thermal pre-treatment that affects predominantly oxydative processes in the matrix. A protecting influence of the matrix preventing further reductive attack of the Fe 3+ Fe 2+ ions by hydrogen has been established.