Synthesis of Pb(Mg1/3Nb2/3)O-3 in excess lead oxide by mechanical activation

Citation
Jm. Xue et al., Synthesis of Pb(Mg1/3Nb2/3)O-3 in excess lead oxide by mechanical activation, J AM CERAM, 84(3), 2001, pp. 660-662
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
84
Issue
3
Year of publication
2001
Pages
660 - 662
Database
ISI
SICI code
0002-7820(200103)84:3<660:SOPIEL>2.0.ZU;2-W
Abstract
Twenty hours of mechanical activation of mixed oxides at room temperature l ed to the formation of Pb(Mg1/3Nb2/3)O-3 (PMN) in excess PbO. The crystalli nity of the activation-derived perovskite PMN phase was further established when the activated PMN-PbO phase mixture was subjected to calcination at 8 00 degreesC. Pyrochlores, such as Pb3Nb4O13 and Pb2Nb2O7, were not observed as transitional phases on mechanical activation and subsequent calcination , although 50% excess PbO was deliberately added. The perovskite PMN phase was recovered by mashing off excess PbO using acetic acid solution at room temperature. It was sintered to a relative density of 98.9% of theoretical at 1200 degreesC for 1 h and the sintered PMN exhibited a dielectric consta nt of similar to 14 000 at 100 at and a Curie temperature of -11 degreesC.