| Autor: |
Takayuki Komatsu, Takuya Togashi, Tsuyoshi Honma |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society. 97:835-842 |
| ISSN: |
0002-7820 |
| DOI: |
10.1111/jace.12701 |
| Popis: |
The formation behavior of spinel-type LiFeSiO4 crystals in the quenching of melts in the Li2O–Fe2O3–SiO2 system was examined. It was found that high quenching rates of 103 ~ 106 K/min are favorable for the formation of LiFeSiO4 crystals. The rapid quenched samples showed high electrical conductivities of the order of 10−2–10−4 S/cm at room temperature and low activation energy for conduction of 0.1–0.2 eV. Both valences of Fe2+ and Fe3+ were present in the melt-quenched samples, and rapid-quenched samples showed ferrimagnetism. It is proposed that the chemical composition of LiFeSiO4 formed in the rapid quenching of melts would be spinel-type Li1 + xFe3+1 − xFe2+xSiO4. Because the Li1 + xFe3+1 − xFe2+xSiO4 crystalline phases are metastable, the rapid quenching technique is necessary for their synthesis. The effects of quenching rate and composition on the formation of spinel-type LiFeSiO4 and on the electrical conductivity of quenched samples were discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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