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

Author

Kinka, Martynas ; Banys, Juras ; Böhlmann, Winfried ; Bierwirth, Eicke ; Hartmann, Martin ; Michel, Dieter ; Völkel, Georg ; Pöppl, Andreas

Author_Institution

Phys. Fac., Vilnius Univ.

Volume

53

Issue

12

fYear

2006

fDate

12/1/2006 12:00:00 AM

Firstpage

2305

Lastpage

2308

Abstract

Dielectric properties of barium titanate (BaTiO₃) 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 BaTiO₃ 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 BaTiO₃ 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

Keywords

adsorption; barium compounds; mesoporous materials; molecular sieves; nanoparticles; permittivity; water; 100 to 500 K; 20 to 1E6 Hz; BaTiO₃; H₂O; MCM-41 mesoporous molecular sieve materials; adsorbed water molecules; barium titanate; dielectric properties; dielectric response; dielectric spectra; dielectric spectroscopy; porous matrix; Barium; Dielectric materials; Electrochemical impedance spectroscopy; Ferroelectric materials; Mesoporous materials; Molecular sieves; Nanostructured materials; Nanostructures; Temperature; Titanium compounds;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2006.178

Filename

4037266