Dielectric spectroscopy of Nano BaTiO/sub 3/ confined in MCM-41 mesoporous molecular sieve materials

Dielectric properties of barium titanate (BaTiO 3 ) particles, synthesized directly in the pores of MCM-41 materials, have been investigated in the frequency range from 20 Hz to 1 MHz for temperature intervals from 100 K to 500 K. The dielectric spectra of BaTiO 3 confined in these molecular sieves...

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Veröffentlicht in:	IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2006-12, Vol.53 (12), p.2305-2308
Hauptverfasser:	Kinka, M., Banys, J., Bohlmann, W., Bierwirth, E., Hartmann, M., Michel, D., Volkel, G., Poppl, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Barium Barium titanates Dielectric materials Dielectric properties Electrochemical impedance spectroscopy Ferroelectric materials Mesoporous materials Molecular sieves Nanocomposites Nanostructure Nanostructured materials Nanostructures Phase transformations Spectra Temperature Titanium compounds
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Beschreibung
Zusammenfassung:	Dielectric properties of barium titanate (BaTiO 3 ) particles, synthesized directly in the pores of MCM-41 materials, have been investigated in the frequency range from 20 Hz to 1 MHz for temperature intervals from 100 K to 500 K. The dielectric spectra of BaTiO 3 confined in these molecular sieves were compared with the results obtained from the investigation of pure MCM-41 materials. Obtained results confirmed successful incorporation of BaTiO 3 into porous matrix, but no phase transition from paraelectric to ferroelectric phase was observed due to the particle size being smaller than the critical size. Also, the overall dielectric response of investigated materials is strongly influenced by adsorbed water molecules
ISSN:	0885-3010 1525-8955
DOI:	10.1109/TUFFC.2006.178