Ternary system Li2O-K2O-Nb2O5 Part I

Phase equilibria around the lithium niobate existence field

M. Cochez, M. Ferriol, L. Pöppl, K. Polgár, A. Péter

Research output: Contribution to journalArticle

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Abstract

In order to optimize the growth conditions of stoichiometric lithium niobate from K2O-Li2O-Nb2O5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li2O-K2O-Nb 2O5. 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 + Li3NbO 4 + LiNbO3, Liq + KNbO3 + LiNbO3, Liq + KLN solid solution + LiNbO3 and Liq + LiNb3O 8 + LiNbO3. In the region investigated, three ternary invariant reactions were found. The first <LiNbO3 > + <KNbO3 > ⇄ <β-Li3NbO4 > + <KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ <β-Li3NbO4 > + <KNbO3 > + <LiNbO3 > and the last one is the quasi-peritectic reaction: Liq+ ⇄ <KNbO3 > + <LiNbO3 > at about 1050-1055 °C.

Original languageEnglish
Pages (from-to)238-245
Number of pages8
JournalJournal of Alloys and Compounds
Volume386
Issue number1-2
DOIs
Publication statusPublished - Jan 11 2005

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Ternary systems
Phase equilibria
Lithium
X ray powder diffraction
Eutectics
Solid solutions
Crystallization
Fluxes
Experiments
lithium niobate

Keywords

  • Crystal growth
  • Non-linear optics
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Ternary system Li2O-K2O-Nb2O5 Part I : Phase equilibria around the lithium niobate existence field. / Cochez, M.; Ferriol, M.; Pöppl, L.; Polgár, K.; Péter, A.

In: Journal of Alloys and Compounds, Vol. 386, No. 1-2, 11.01.2005, p. 238-245.

Research output: Contribution to journalArticle

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abstract = "In order to optimize the growth conditions of stoichiometric lithium niobate from K2O-Li2O-Nb2O5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li2O-K2O-Nb 2O5. 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 + Li3NbO 4 + LiNbO3, Liq + KNbO3 + LiNbO3, Liq + KLN solid solution + LiNbO3 and Liq + LiNb3O 8 + LiNbO3. In the region investigated, three ternary invariant reactions were found. The first <LiNbO3 > + <KNbO3 > ⇄ <β-Li3NbO4 > + <KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ <β-Li3NbO4 > + <KNbO3 > + <LiNbO3 > and the last one is the quasi-peritectic reaction: Liq+ ⇄ <KNbO3 > + <LiNbO3 > at about 1050-1055 °C.",
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AU - Ferriol, M.

AU - Pöppl, L.

AU - Polgár, K.

AU - Péter, A.

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N2 - In order to optimize the growth conditions of stoichiometric lithium niobate from K2O-Li2O-Nb2O5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li2O-K2O-Nb 2O5. 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 + Li3NbO 4 + LiNbO3, Liq + KNbO3 + LiNbO3, Liq + KLN solid solution + LiNbO3 and Liq + LiNb3O 8 + LiNbO3. In the region investigated, three ternary invariant reactions were found. The first <LiNbO3 > + <KNbO3 > ⇄ <β-Li3NbO4 > + <KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ <β-Li3NbO4 > + <KNbO3 > + <LiNbO3 > and the last one is the quasi-peritectic reaction: Liq+ ⇄ <KNbO3 > + <LiNbO3 > at about 1050-1055 °C.

AB - In order to optimize the growth conditions of stoichiometric lithium niobate from K2O-Li2O-Nb2O5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li2O-K2O-Nb 2O5. 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 + Li3NbO 4 + LiNbO3, Liq + KNbO3 + LiNbO3, Liq + KLN solid solution + LiNbO3 and Liq + LiNb3O 8 + LiNbO3. In the region investigated, three ternary invariant reactions were found. The first <LiNbO3 > + <KNbO3 > ⇄ <β-Li3NbO4 > + <KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ <β-Li3NbO4 > + <KNbO3 > + <LiNbO3 > and the last one is the quasi-peritectic reaction: Liq+ ⇄ <KNbO3 > + <LiNbO3 > at about 1050-1055 °C.

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