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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
https://hal-mines-paristech.archives-ouvertes.fr/hal-00462410
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 9 mars 2010 - 15:41:15
Dernière modification le : jeudi 24 septembre 2020 - 18:30:06
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 9 mars 2010 - 15:41:15
Dernière modification le : jeudi 24 septembre 2020 - 18:30:06
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