Dielectric spectroscopy of nano BaTiO3 confined in MCM-41 mesoporous molecular sieve materials.
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.
Kinka
Martynas
M
Physic Faculty, Vilnius University, Sauletekio 9, Vilnius LT-10222, Lithuania. martynas.kinka@ff.vu.lt
Banys
Juras
J
Böhlmann
Winfried
W
Bierwirth
Eicke
E
Hartmann
Martin
M
Michel
Dieter
D
Völkel
Georg
G
Pöppl
Andreas
A
D017609:Barium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004574:Electromagnetic Fields; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D013057:Spectrum Analysis; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*
D017609:Barium Compounds; C024547:barium titanate(IV); D014025:Titanium