DocumentCode :
1627482
Title :
High frequency dielectric spectroscopy of relaxor ferroelectrics and related materials
Author :
Bovtun, Viktor ; Petzelt, Jan ; Kamba, Stanislav ; Porokhonskyy, Viktor ; Pashkin, Alexej ; Veljko, Sergiy ; Samoukhina, Polina ; Yakimenko, Yuri
Author_Institution :
Inst. of Phys., Acad. of Sci. of the Czech Republic, Praha, Czech Republic
Volume :
2
fYear :
2004
Firstpage :
757
Abstract :
Relaxor and doped incipient ferroelectrics represent the partially disordered solids, where the main lattice periodicity is preserved and only some of the sublattices exhibit disorder. Dielectric response of these polar materials is defined by both crystal lattice dynamics and relaxational processes in a wide frequency range below the phonon frequencies. High frequency part of the response is very important for studying the nature of disorder and the relation between the relaxation processes and the crystal lattice dynamics. Here we analyze the high frequency dielectric response (1 MHz - 100 THz) of model lead-containing perovskite relaxor ferroelectrics (PMN, PLZT), moderately doped incipient ferroelectrics (Sr1-1.5xBixTiO3 and K1-xLixTaO3) and pyrochlore high-ε microwave ceramics ((Bi,Zn)2(Zn,Nb)2O7), studied by the coaxial and waveguide microwave methods, time domain THz spectroscopy and infrared reflectivity.
Keywords :
anharmonic lattice modes; bismuth compounds; dielectric losses; dielectric relaxation; ferroelectric materials; lanthanum compounds; lead compounds; lithium compounds; microwave materials; microwave measurement; permittivity; potassium compounds; reflectivity; relaxor ferroelectrics; soft modes; strontium compounds; submillimetre wave spectra; zinc compounds; (BiZn)2(ZnNb)2O7; (KLi)TaO3; (SrBi)TiO3; 1 MHz to 100 THz; PLZT; PMN; PbLaZrO3TiO3; PbMgO3NbO3; anharmonic motion; coaxial microwave method; crystal lattice dynamics; dielectric losses; dielectric permittivity; dielectric relaxation; dielectric response; doped incipient ferroelectrics; high frequency dielectric spectroscopy; hopping of disordered atoms; incomplete phonon mode softening; infrared reflectivity; partially disordered solids; perovskite ferroelectrics; polar materials; polar nanoclusters; pyrochlore microwave ceramics; relaxational dielectric dispersion; relaxor ferroelectrics; temperature dependences; time domain THz spectra; waveguide microwave method; Crystalline materials; Dielectric materials; Electrochemical impedance spectroscopy; Ferroelectric materials; Frequency; Infrared spectra; Lattices; Microwave theory and techniques; Relaxor ferroelectrics; Solids;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves, 2004. MSMW 04. The Fifth International Kharkov Symposium on
Print_ISBN :
0-7803-8411-3
Type :
conf
DOI :
10.1109/MSMW.2004.1346133
Filename :
1346133
Link To Document :
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