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Mechanism of CeMgAl11O19: Tb3+ alkaline fusion with sodium hydroxide

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Abstract

Comprehensive CeMgAl11O19: Tb3+ (CTMA) disintegration via alkaline fusion was discussed. The rare earth (RE) elements in CTMA were dissolved by HCl completely after alkaline fusion. Relationships between the alkaline fusion temperature and various properties of the compounds were examined by various techniques to elucidate their roles in the expected CTMA disintegration. X-ray diffraction (XRD) analysis indicates the phase transformation sequence. A scientific hypothesis of crystal structure disintegration presents that sodium ions substitute for the europium and barium ions in the mirror plane and magnesium ions in the spinel block successively, resulting in that more oxygen vacancies and interstitial sodium ions appear. The unit cell [P63/mmc (194)] breaks from the mirror plane. Then it is decomposed into NaAlO2, and magnesium, cerium, and terbium ions combine with free OH− into MgO, Tb2O3 and CeO2; Tb2O3 and CeO2 change into Ce0.6Tb0.4O2−x . In the end, the rare earth oxide is recycled easily by the acidolysis. The mechanism provides fundamental basis for recycling of REEs from waste phosphors.

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Acknowledgments

The work was financially supported by the National Key Project of the Scientific and Technical Support Program of China (No. 2012BAC02B01), the National Hi-Tech R&D Program of China (No. 2012AA063202), the National Natural Science Foundation of China (No. 51472030), the Fundamental Research Funds for the Central Universities (Project No. FRF-TP-14-043A1), and the China Postdoctoral Science Foundation Funded Project (No. 2014M560885).

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Authors and Affiliations

  1. Institute for Advanced Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hu Liu, Shen-Gen Zhang, De-An Pan, Yi-Fan Liu, Bo Liu & Jian-Jun Tian

  2. Department of Mechanical Engineering, University of South Florida, Tampa, FL, 33620, USA

    Alex A. Volinsky

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  1. Hu Liu
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  2. Shen-Gen Zhang
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  3. De-An Pan
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  4. Yi-Fan Liu
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  5. Bo Liu
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  6. Jian-Jun Tian
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  7. Alex A. Volinsky
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Correspondence to Shen-Gen Zhang.

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Liu, H., Zhang, SG., Pan, DA. et al. Mechanism of CeMgAl11O19: Tb3+ alkaline fusion with sodium hydroxide. Rare Met. 34, 189–194 (2015). https://doi.org/10.1007/s12598-014-0439-4

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  • DOI: https://doi.org/10.1007/s12598-014-0439-4

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