ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 28    No. 9    September 2018

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Modified combustion synthesis of g-LiAlO2 using metal oxides
Daniel CRUZ1, H. B. ORTIZ-OLIVEROS2, L. M. PéREZ-DíAZ1, R. M. FLORES-ESPINOSA2, G. ROSANO-ORTEGA3
(1. Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, 14 Sur y San Claudio, Ciudad Universitaria, C.P. 72570, Cd. Puebla, México;
2. Instituto Nacional de Investigaciones Nucleares, Dirección de Investigación Tecnológica, Apartado Postal 18-1027, 11801 México, DF, México;
3. Universidad Popular Autónoma del Estado de Puebla, 21 Sur no. 1103, Colonia Santiago, C.P. 72410, Puebla, México
)
Abstract: An alternative solution for the direct formation of g-LiAlO2 was presented by a modified combustion method, to apply it to rather simple systems, utilizing non-oxidizer compounds such as Al2O3 and LiOH, and urea as fuel. LiAlO2 was prepared via non-stoichiometric 1:1, 1.5:1 and 2:1 of Li/Al molar ratios at 900 and 1000 °C for 5 min. Textural and structural characterization of γ-LiAlO2 was performed. Also, the effect of different Li/Al molar ratios on material morphology and its stability before high gamma radiation gradients was evaluated. The results showed that the crystal structures of the obtained powders were γ-LiAlO2 and a-LiAlO2, depending on the Li/Al molar ratio. The results obtained demonstrate that g-LiAlO2 microbricks, polyhedral and laminar shapes can be successfully synthesized with the proposed method and without any subsequent process. Additionally, gamma irradiation showed that the g-LiAlO2 obtained does not decompose, forming only small amounts of Li2CO3. It can be established that the irradiation produces consolidation, which is not favourable for an efficient extraction of tritium. Finally, it could be demonstrated that nitrate precursors are not necessary in the combustion method to produce γ-LiAlO2 with high purity.
Key words: urea; oxide; combustion; lithium aluminate; ceramic
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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