The formation and growth of CeOCl crystals in a molten KCl-LiCl flux
Source abstract
Abstract
The formation and growth of CeOCl crystals from a Ce3+ precursor in a molten KCl-LiCl flux was investigated. The formation of CeOCl occurred through the reaction Ce3+ + Cl− + [O2−] = CeOCl, where Ce3+ came from both CeO2−x (0 < x < 0.5) and Ce2O3, and the [O2−] was the lattice oxygen. CeOCl started to form in the powder together with ceria at 400 °C under hydrogen atmosphere, and the CeOCl content was 91.3% then decreased with increasing synthesis temperature. The growth of CeOCl crystals observed by SEM images revealed that cubic CeOCl particles were formed from polyhedral flakes. Photo-Luminescence (PL) spectra showed that the violet-blue light can be emitted from synthesized powder, which suggests CeOCl can be a potential luminescence material.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Luminescence Properties of Advanced Materials · Radioactive element chemistry and processing
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References (17)
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1. L. Kepiński, M. Wołcyrz, J. Okal, Effect of chlorine on microstructure and activity of Pd/CeO2 catalysts. J. Chem. Soc. Faraday Trans. 91, 507–515 (1995)10.1039/FT9959100507 ↗
2. F. Fajardie, O. Tempere, J.M. Manoli, G. Djegamariadassou, G. Blanchard, Ceria lattice oxygen ion substitution by Cl– during the reduction of Rh(Cl)/CeO2 catalysts. Formation and stability of CeOCl. J. Chem. Soc. Faraday Trans. 94, 3727–3735 (1998)10.1039/a805625k ↗
3. L. Kȩpiński, J. Okal, Occurrence and mechanism of formation of CeOCl in Pd/CeO2 catalysts. J. Catal. 192, 48–53 (2000)10.1006/jcat.2000.2823 ↗
4. R. Farra, F. Girgsdies, W. Frandsen, M. Hashagen, R. Schlögl, D. Teschner, Synthesis and catalytic performance of CeOCl in deacon reaction. Catal. Lett. 143, 1012–1017 (2013)10.1007/s10562-013-1085-4 ↗
5. L. Zhang, Y. Cheng, L. Lei, X. Wang, Q. Hu, Q. Wang, H. Ohfuji, Y. Kojima, Q. Zhang, Z. Zeng, F. Peng, Z. Kou, D. He, T. Irifune, High-Pressure synthesis of CeOCl crystals and investigation of their photoluminescence and compressibility properties. Crys. Growth Des. 18, 1843–1847 (2018)10.1021/acs.cgd.7b01712 ↗
6. S.W. Depner, K.R. Kort, C. Jaye, D.A. Fischer, S. Banerjee, Nonhydrolytic synthesis and electronic structure of ligand-capped CeO2 – δ and CeOCl nanocrystals. J. Phys. Chem. C 113, 14126–14134 (2009)10.1021/jp903216b ↗
7. X. Kang, Q. Xu, X. Yang, Q. Song, Electrochemical synthesis of CeNi 4 Cu alloy from the mixed oxides and in situ heat treatment in a eutectic LiCl–KCl melt. Mater. Lett. 64, 2258–2260 (2010)10.1016/j.matlet.2010.07.007 ↗
8. Y.P. Lan, H.Y. Sohn, Y. Mohassab, Q. Liu, B. Xu, Nanoceria synthesis in the KCl-LiCl salt system: crystal formation and properties. J. Am. Ceram. Soc. 100, 1863–1875 (2017)10.1111/jace.14747 ↗
9. W.C. Chueh, C. Falter, M. Abbott, D. Scipio, P. Furler, S.M. Haile, A. Steinfeld, High-flux solar-driven thermochemical dissociation of CO2 and H2O using nonstoichiometric ceria. Science 330, 1797–1801 (2010)10.1126/science.1197834 ↗
10. S. Ackermann, L. Sauvin, R. Castiglioni, J.L. Rupp, J.R. Scheffe, A. Steinfeld, Kinetics of CO2 reduction over nonstoichiometric ceria. J. Phys. Chem. C 119, 16452–16461 (2015)10.1021/acs.jpcc.5b03464 ↗
11. R. Verma, S. Samdarshi, S. Bojja, S. Paul, B. Choudhury, A novel thermophotocatalyst of mixed-phase cerium oxide (CeO2/Ce2O3) homocomposite nanostructure: role of interface and oxygen vacancies. Sol. Energy Mater. Sol. Cells 141, 414–422 (2015)10.1016/j.solmat.2015.06.027 ↗
12. Y.P. Lan, H.Y. Sohn, Nanoceria synthesis in molten KOH-NaOH mixture: characterization and oxygen vacancy formation. Ceram. Int. 44, 3847–3855 (2018)10.1016/j.ceramint.2017.11.172 ↗
13. Y.P. Lan, H.Y. Sohn, Y. Mohassab, Q. Liu, B. Xu, Properties of stable nonstoichiometric nanoceria produced by thermal plasma. J. Nanoparticle Res. 19, 281 (2017)10.1007/s11051-017-3984-6 ↗
14. Y. Shen, J. Zhang, E-pO2– diagram for rare earth elements in molten salt. J. Rare Earths 35, 187–192 (2017)10.1016/S1002-0721(17)60898-6 ↗
15. Hillier, Accurate quantitative analysis of clay and other minerals in sandstones by XRD: comparison of a Rietveld and a reference intensity ratio (RIR) method and the importance of sample preparation. Clay Mine. 35, 291–302 (2000)10.1180/000985500546666 ↗
16. R. Ma, M. Jahurul Islam, D. Amaranatha Reddy, T.K. Kim, Transformation of CeO2 into a mixed phase CeO2/Ce2O3 nanohybrid by liquid phase pulsed laser ablation for enhanced photocatalytic activity through Z-scheme pattern. Ceram. Int. 42, 18495–18502 (2016)10.1016/j.ceramint.2016.08.186 ↗
17. Y.P. Lan, H.Y. Sohn, Effect of oxygen vacancies and phases on catalytic properties of hydrogen-treated nanoceria particles. Mater. Res. Express 5, 035501 (2018)10.1088/2053-1591/aaaff4 ↗