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Ordering Behavior of Lead Magnesium Niobate Ceramics with A‐Site Substitution
Author(s) -
Lin LiJiaun,
Wu TaiBor
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05188.x
Subject(s) - lanthanum , valence (chemistry) , magnesium , niobium , materials science , superlattice , ceramic , ion , crystal structure , diffraction , mineralogy , inorganic chemistry , crystallography , chemistry , metallurgy , optics , optoelectronics , physics , organic chemistry
The ordering behavior of lanthanum‐modified lead magnesium niobate ceramics was investigated over a wide range of lanthanum content (from 0 to 50 at.%). The ordering of magnesium and niobium ions in the B site was examined by X‐ray diffraction, and the superlattice reflection was associated with the A(B′ 1/2 B″ 1/2 )O 3 ‐type partial ordering structure. Moreover, the ordering degree increased pronouncedly with respect to lanthanum content of the sample and almost reached unity at [La] = 50 at.%. Finally, a comparison of the ordering behavior was performed among several lead magnesium niobate (PMN) samples with different A‐site substitutional ions. The mechanism used to enhance the ordering of PMN by A‐site substitution is then described by the effect of high valence.