Ternary system Li2O–K2O–Nb2O5
| Autor: | L. Pöppl, Ágnes Péter, M. Cochez, K. Polgár, Michel Ferriol |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Potassium niobate
Ternary numeral system Mechanical Engineering Lithium niobate Metals and Alloys Analytical chemistry law.invention Crystallography chemistry.chemical_compound chemistry Mechanics of Materials law Materials Chemistry Crystallization Ternary operation Phase diagram Solid solution Eutectic system |
| Zdroj: | Journal of Alloys and Compounds. 386:238-245 |
| ISSN: | 0925-8388 |
| Popis: | In order to optimize the growth conditions of stoichiometric lithium niobate from K 2 O–Li 2 O–Nb 2 O 5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li 2 O–K 2 O–Nb 2 O 5 . For this purpose, suitable parts of four vertical sections were studied using DSC experiments and X-ray powder diffraction allowed to identify all the solid phases involved. The lithium niobate liquidus surface is delimited by four monovariant lines: Liq + Li 3 NbO 4 + LiNbO 3 , Liq + KNbO 3 + LiNbO 3 , Liq + KLN solid solution + LiNbO 3 and Liq + LiNb 3 O 8 + LiNbO 3 . In the region investigated, three ternary invariant reactions were found. The first LiNb O 3 > + KNb O 3 > ⇄ β -L i 3 Nb O 4 > + KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ β -L i 3 Nb O 4 > + KNb O 3 > + LiNb O 3 > and the last one is the quasi-peritectic reaction: Liq + KLN solid solution > ⇄ KNb O 3 > + LiNb O 3 > at about 1050–1055 °C. |
| Databáze: | OpenAIRE |
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