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Novel Route to Lead‐Based Ferroelectric Compounds via Tetragonal Lead(II) Oxide Intermediates
Author(s) -
Han Kyoung R.,
Koo Hee Jin,
Lim Chang Sup
Publication year - 2000
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.1151-2916.2000.tb01537.x
Subject(s) - tetragonal crystal system , calcination , sintering , lead oxide , ferroelectricity , perovskite (structure) , materials science , dielectric , phase (matter) , oxide , mineralogy , analytical chemistry (journal) , inorganic chemistry , crystallography , nuclear chemistry , chemistry , crystal structure , metallurgy , catalysis , organic chemistry , optoelectronics
Single‐phase perovskite lead‐based ferroelectric powders—Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) or 0.9Pb(Mg 1/3 Nb 2/3 )O 3 –0.1PbTiO 3 (0.9PMN–0.1PT)—were prepared using Mg(NO 3 ) 2 , instead of MgO or MgCO 3 , via a mixed‐oxide method and one‐step calcination. The reaction proceeded via the formation of 3Pb(NO 3 ) 2 ·7PbO, Pb(OH) 2 , tetragonal PbO, and then 2PbO–Nb 2 O 5 (P 2 N) for PMN or 3PbO–Nb 2 O 5 (P 3 N) for PMN–PT; a mixture of PMN and Pb 2 (Mg x Nb 1.33 )O 5.33+ x then formed, followed finally by the formation of single‐phase PMN or 0.9PMN–0.1PT. Such prepared powder showed excellent room‐temperature dielectric constants—13800 for PMN or 22600 for 0.9PMN–0.1PT—by sintering at a temperature of 900°C for 2 h.