Publicação: Effect of magnesium on structure and properties of LiNbO3 prepared from polymeric precursors
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Elsevier B.V.
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The effect of magnesium addition on the phase formation and electric properties of LiNbO3 powder prepared from polymeric precursor was analyzed. It was shown that the unit-cell volume of the rhombohedral phase decreased with increasing magnesium concentration. Small amounts of secondary phases were observed in LiNbO3 powder doped with 5 and 10 mol% Mg+2. These results indicated that the Mg+2 ion was substituted for niobium ion in the rhombohedral phase. The addition of Mg+2 promotes densification of LiNbO3 ceramics. It was noticed that the increase in additive concentration leads to a decrease of electric properties, K-p and d(33). This is due to formation of LiNb3O8 and MgNb2O6 phases at the grain boundaries. (C) 2002 Elsevier B.V. Ltd and Techna S.r.l. All rights reserved.
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calcination, organic precursors, X-ray methods, electrical properties, niobates
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Inglês
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Ceramics International. Oxford: Elsevier B.V., v. 28, n. 3, p. 265-270, 2002.
