NDLI: Reaction chemistry and subsolidus phase equilibria in lead-based relaxor systems Part II The ternary system PbO-MgO-Nb$_{2}$O$

Content Provider	Springer Nature Link
Author	Guha, J. P.
Copyright Year	2001
Abstract	Subsolidus compatibility relations in the lead-based relaxor system PbO-MgO-Nb$_{2}$O$_{5}$ were investigated by the solid-state reaction technique and the various phase assemblages that occur at 825°C in this system established. The existence of two previously reported ternary compounds, i.e. a cubic perovskite Pb$_{3}$MgNb$_{2}$O$_{9}$ [Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$] and an oxygen- deficient cubic pyrochlore Pb$_{6}$MgNb$_{6}$O$_{22}$ [Pb$_{1.714}$(Mg$_{0.286}$Nb$_{1.714}$)O$_{6.286}$] was confirmed. A minor amount of PbO enters into the pyrochlore lattice and forms a narrow homogeneity range within the ternary system PbO-MgO-Nb$_{2}$O$_{5}$ which corresponds to a general formula Pb$_{2 − x }$(Mg$_{0.286}$Nb$_{1.714}$)O$_{6.571 − x }$, where 0 > x > 0.286. At subsolidus temperatures (<825°C), the perovskite Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ is compatible with the ternary pyrochlore solid solution and together they form a biphasic area within the system in which the perovskite and the pyrochlore phases coexist with one another. Both PbO and MgO are compatible with the perovskite Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ and these phases constitute a compatibility triangle with one another in the ternary system. However, the perovskite Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$ is not compatible with Nb$_{2}$O$_{5}$ and these two phases react with one another to yield the pyrochlore Pb$_{6}$MgNb$_{6}$O$_{22}$ and MgO. The ternary pyrochlore solid solution is compatible with several binary lead niobates, i.e. Pb$_{3}$Nb$_{2}$O$_{8}$, Pb$_{5}$Nb$_{4}$O$_{15}$, Pb$_{2}$Nb$_{2}$O$_{7}$ and Pb$_{3}$Nb$_{4}$O$_{13}$ and forms pseudobinary tie-lines with these compounds in the ternary system PbO-MgO-Nb$_{2}$O$_{5}$. The pyrochlores Pb$_{3}$Nb$_{4}$O$_{13}$ [Pb$_{1.5}$Nb$_{2}$O$_{6.5}$] and Pb$_{6}$MgNb$_{6}$O$_{22}$ [Pb$_{1.714}$(Mg$_{0.286}$ Nb$_{1.714}$)O$_{6.286}$] are isostructural compounds and a series of continuous solid solution is formed between them.
Starting Page	5219
Ending Page	5226
Page Count	8
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	36
Issue Number	21
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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