Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 5, Pages 6221-6227Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.01.004
Keywords
La2Zr2O7; Molten salt; Ultrafine powders
Categories
Funding
- National Natural Science Foundation of China [51272188, 51472184, 51472185]
- State Basic Research Development Program of China (973 Program) [2014CB660802]
- National Science Foundation of Hubei Province, China [2013CFA086]
- Foreign cooperation projects in Science and Technology of Hubei Province, China [2013BH002]
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Ultrafine powders of pyrochlore-type La2Zr2O7 were synthesized via a simple molten salt mediated process using zirconium oxide and lanthanum oxide as raw materials, and sodium chloride, potassium chloride and sodium fluoride to form a reaction medium. The effects of reaction temperature, salt/reactant ratio and salt type on the La2Zr2O7 formation were investigated. Among the three attempted salt assemblies (KCl-LiCl, Na2CO3-K2CO3, and NaCl-KCl-NaF), NaCl-KCl-NaF showed the best accelerating effect on the La2Zr2O7 formation. At a given temperature, the La2Zr2O7 content in the final products increased with the increase in the salt amount. Phase pure submicron sized La2Zr2O7 ultrafine powders were obtained after 3 h firing at 1100 degrees C with the salt/reactant weight ratio of 5:1 or at 1200 degrees C with salt/reactant weight ratio of 3:1. The synthesis temperature (1100 degrees C) was much lower than that required by the conventional solid-state mixing method or a wet chemical. method. The dissolution-precipitation mechanism had dominated the synthesis process. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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