| Issue |
J. Phys. IV France
Volume 128, September 2005
|
|
|---|---|---|
| Page(s) | 81 - 85 | |
| DOI | https://doi.org/10.1051/jp4:2005128013 | |
J. Phys. IV France 128 (2005) 81-85
DOI: 10.1051/jp4:2005128013
Dielectric spectroscopy of BaTiO3 confined in MCM-41 mesoporous molecular sieve materials
M. Kinka1, J. Banys1, W. Böhlmann2, E. Bierwirth2, M. Hartmann3, D. Michel2, G. Völkel2 and A. Pöppl21 Faculty of Physics, Vilnius University, Sauletekio 9, 2040 Vilnius, Lithuania
2 University of Leipzig, Faculty of Physics and Geoscience, Linnéstr. 5, 04103 Leipzig, Germany
3 Department of Chemistry, Chemical Technology, University of Kaiserslautern, Erwin-Schrödinger-Str. 54, 67663 Kaiserslautern, Germany
Abstract
Dielectric properties of Barium titanate 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
interval from 100 K to 500 K. The pore diameters were 2.0 nm, 2.5 nm and 3.7
nm, and thus the synthesized particles size was already below the critical
size of BaTiO3. The dielectric spectra of Barium titanate 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.
© EDP Sciences 2005