Title :
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.
fDate :
12/1/2006 12:00:00 AM
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;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2006.178
