Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/94621
Title: Processing and characterization of microemulsion-derived lead magnesium niobate
Authors: Ng, W.B.
Wang, J. 
Ng, S.C. 
Gan, L.M. 
Issue Date: 1999
Source: Ng, W.B.,Wang, J.,Ng, S.C.,Gan, L.M. (1999). Processing and characterization of microemulsion-derived lead magnesium niobate. Journal of the American Ceramic Society 82 (3) : 529-536. ScholarBank@NUS Repository.
Abstract: Lead magnesium niobate, Pb(Mg1/3Nb2/3)O3 (PMN), with 3 wt% excess PbO content has been successfully prepared via a microemulsion processing technique. By stepwise hydrolysis using aqueous ammonia as the precipitant, hydroxide precursor was obtained from nitrate solutions dispersed in the nanosized aqueous domains of a microemulsion consisting of cyclohexane, mixed poly(oxyethylene)5 nonyl phenol ether (NP5) and poly(oxyethylene)9 nonyl phenol ether (NP9), and an aqueous phase. Upon calcination of the microemulsion-derived precursor at 780 °C, an ultrafine perovskite PMN powder with less than 5% pyrochlore phase was obtained. The percentage of perovskite phase increases with increasing calcination temperature, reaching approximately 98% at 900 °C. The resulting PMN powder exhibits a near-spherical particle morphology although particle agglomerates of approximately 0.3 μm in average diameter occur when they are calcined at 850 °C. When sintered at 1150 °C, the microemulsion-derived PMN showed a maximum relative density of approximately 95.6% theoretical density, which gives a maximum dielectric constant of approximately 11 000 at 1 kHz and a Curie temperature of -6 °C.
Source Title: Journal of the American Ceramic Society
URI: http://scholarbank.nus.edu.sg/handle/10635/94621
ISSN: 00027820
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

25
checked on Feb 16, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.