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Activation‐Induced Pyrochlore‐to‐Perovskite Conversion for a Lead Magnesium Niobate Precursor
Author(s) -
Junmin Xue,
Wang John,
Weibeng Ng,
Dongmei Wan
Publication year - 1999
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.1151-2916.1999.tb02081.x
Subject(s) - pyrochlore , calcination , perovskite (structure) , materials science , magnesium , chemical engineering , mineralogy , phase (matter) , inorganic chemistry , metallurgy , chemistry , catalysis , organic chemistry , engineering , biochemistry
One or more pyrochlore phases are often involved as transitional phases prior to the formation of the perovskite phase in lead magnesium niobate (PMN) precursors. The elimination of these pyrochlore phases requires careful control of the calcination temperature and therefore is often difficult to complete. We report on the pyrochlore‐to‐perovskite conversion triggered by mechanical activation in a freeze‐dried PMN precursor. The resulting PMN powder exhibits a well‐established crystalline perovskite structure which is stable for calcination temperatures ranging from 400° to 800°C. A refined particle size in the range of 30‐50 nm was obtained.