Thermal behavior of the nonstoichiometric lithium niobate powders synthesized via a combustion method
| Autor: | Chia-Liang Kuo, Yee-Shin Chang, Jian-Xun Fu, Guo-Ju Chen, Yen-Hwei Chang, Weng-Sing Hwang |
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| Rok vydání: | 2012 |
| Předmět: |
Diffraction
Thermogravimetric analysis Materials science Scanning electron microscope Process Chemistry and Technology Inorganic chemistry Lithium niobate Analytical chemistry Crystal structure Combustion Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion law.invention chemistry.chemical_compound chemistry law Materials Chemistry Ceramics and Composites Calcination |
| Zdroj: | Ceramics International. 38:3729-3733 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2012.01.017 |
| Popis: | Lithium niobate (LixNb1−xO3+δ) powders with various compositions are prepared via combustion synthesis. The thermal properties, crystal structure, and surface morphology of the as-prepared lithium niobate powders are characterized by thermogravimetric and differential thermal analyses (TG/DTA), powder X-ray diffraction (XRD), and scanning electron microscopy (SEM). When the calcination temperature reached 900 °C, the secondary phases Li3NbO4 and LiNb3O8 were observed. The lithium concentration before 900 °C was 40–43%. The lattice parameters increased slightly with decreasing concentration of lithium ions. When the calcination temperature was higher than 900 °C, the major Li0.91NbO3 phase and the minor LiNbO3 phase coexisted in the nonstoichiometric lithium niobate with 43% lithium content. |
| Databáze: | OpenAIRE |
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