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Hydrothermal synthesis of ferroelectric mixed potassium niobate-lead titanate nanoparticles

Abstract : Potassium niobate-lead titanate solid-solution nanoparticles have been synthesized using a new hydrothermal method. The key step is an in situ acid-base exothermic reaction with a large excess of KOH, generating an amorphous precipitated gel. This gel, when crystallized in an autoclave for 2 h at 190°C, produces a mixed perovskite solid solution with [KNbO3]0.8-[PbTiO3]0.2 (KNPT) composition, and parallelepiped particles rang in size from a few tens to a few hundreds of nanometer in length. This study proves that the pure perovskite phase can be obtained in spite of the different solubilities of the reactive cations in an ethanol-water solution. Dielectric measurements show that KNPT ceramic with a grain size of 50 nm is ferroelectric at room temperature. In addition, ceramics sintered at 950°C have an average grain size of 500 nm, and exhibit a maximum permittivity of 2100 at 1 kHz near TC = 510 K and a remanent polarization Pr = 12 μC/cm2
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Soumis le : mardi 9 mars 2010 - 15:41:15
Dernière modification le : jeudi 24 septembre 2020 - 18:30:06

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Thierry Delahaye, Ali Al-Zein, Marie-Hélène Berger, Xavier Bril, Jean-François Hochepied. Hydrothermal synthesis of ferroelectric mixed potassium niobate-lead titanate nanoparticles. Journal of the American Ceramic Society, Wiley, 2014, 97, pp.1-9. ⟨10.1111/jace.12778⟩. ⟨hal-00462410⟩



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