Synthesis of single phase 0.9Pb[(Zn{sub 0.6}Mg{sub 0.4}){sub 1/3}Nb{sub 2/3}O{sub 3}]-0.1PbTiO{sub 3} by mechanically activating mixed oxides
- National Univ. of Singapore (Singapore). Dept. of Materials Science
A novel mechanochemical method has been successfully developed to synthesize nanocrystalline 0.9Pb[(Zn{sub 0.6}Mg{sub 0.4}){sub 1} {sub 3}Nb{sub 2} {sub 3}O{sub 3}]-0.1PbTiO{sub 3} (PZN-PMN-PT) powders, lead zinc niobate-lead magnesium niobate-lead titanate, of perovskite structure from constituent oxides. For the first time, the formation of PZN-PMN-PT perovskite phase from the mixed oxides of PbO, ZnO, MgO, Nb{sub 2}O{sub 5} and TiO{sub 2} was triggered by mechanical activation at room temperature, and therefore the multiple phase-forming calcinations at elevated temperatures and the subsequent milling are skipped. The resulting PZN-PMN-PT powder exhibits a high specific surface area of 10.86 m{sup 2}/g with nanocrystallites of 10--15 nm in size and can be sintered to a density of 97% theoretical at 950 C for 1 h. A maximum dielectric constant of 18,986 and a dielectric loss of 0.018 at the Curie temperature of 103 C were measured for the PZN-PMN-PT at 0.1 kHz when it was sintered at 1,100 C for 1 h. A diffuseness parameter of 35 K was estimated, which reflects the microcompositional fluctuation in this relaxor ferroelectric.
- OSTI ID:
- 357938
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 7 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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