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http://dx.doi.org/10.4191/KCERS.2002.39.9.846

Preparation of PMN-PT-BT/Ag Composite and its Mechanical and Dielectric Properties  

Lim, Kyoung-Ran (Division of Materials Science and Engineering, KIST)
Jeong, Soon-Yong (Department of Materials Science and Engineering, Korea University)
Kim, Chang-Sam (Division of Materials Science and Engineering, KIST)
Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.9, 2002 , pp. 846-850 More about this Journal
Abstract
A PMN-PT-BT/Ag composite was prepared by surface modification with MgO sol with hoping to suppress silver's migration during sintering. The mixture of PbO, $N_2O_5,\;TiO_2\;with\;Mg(NO_3)_2$ instead of MgO was ball milled, the solvent was removed and then the dried powders were calcined at 950$^{\circ}C$/1h. The calcined powder were treated with 3.0 mol% $Ag_2O$ and 1.0 wt% MgO sol and calcined at 550$^{\circ}C$/1h. The dielectrics sintered at 1000$^{\circ}C$/4h under a flowing oxygen showed the density of 7.84g/$cm^3$, the room temperature dielectric constant of 18400, the dielectric loss of 2.4%, the specific resistivity of $0.24{\times}10^{12}{\Omega}{\cdot}cm$. It also showed the bending strength of $120.7{\pm}11.26$ MPa and the fracture toughness of $0.87{\pm}0.002\;MPam^{1/2}$ which were comparable to commercial PZT. The microstructure sonsisted of grains of ∼4${\mu}m$. SEM and SIMS analysis showed that Ag grew as ∼1${\mu}m$ and excess MgO as ∼0.5${\mu}m$.
Keywords
PMN-PT-BT; $Ag_2O$; Perovskite; MgO sol; Bending strength; Surface-modification;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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