Effect of magnesium on structure and properties of LiNbO3 prepared from polymeric precursors
Nenhuma Miniatura disponível
Data
2002-01-01
Autores
Simoes, A. Z.
Gonzalez, AHM
Cavalheiro, A. A.
Zaghete, M. A.
Stojanovic, B. D.
Varela, José Arana [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
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.
Descrição
Palavras-chave
calcination, organic precursors, X-ray methods, electrical properties, niobates
Como citar
Ceramics International. Oxford: Elsevier B.V., v. 28, n. 3, p. 265-270, 2002.