Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

August 1998

Abstract

A complete range of perovskite solid solutions can be formed in the (1 - x)Ba(Mg1/3Nb2/3)O3xLa(Mg2/3Nb1/3)O3 (BMN–LMN) pseudobinary system. While pure BMN adopts a 1:2 cation ordered structure, 1:1 ordered phases are stabilized for 0.05 ≤ x ≤ 1.0. Dark-field TEM images indicate that the La-doped solid solutions are comprised of large 1:1 ordered domains and no evidence was found for a phase-separated structure. This observation coupled with the systematic variations in the intensities of the supercell reflections supports a charge-balanced "random-site" model for the 1:1 ordering. The substitution of La also induces a transformation from a negative to positive temperature coefficient of capacitance in the region 0.25 ≤ x ≤ 0.5.

Comments

Copyright The American Ceramic Society. Reprinted from Journal of the American Ceramic Society, Volume 81, Issue 8, August 1998, pages 2205-2208.

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Date Posted: 02 February 2005

This document has been peer reviewed.