Title :
Diffuse phase transition and relaxor behavior in perovskites
Author :
Schmitt, Heinz ; Simon, Doris ; Pitzius, Peter
Author_Institution :
Fachbereich Phys., Univ. des Saarlandes, Saarbrucken, Germany
fDate :
30 Aug-2 Sep 1992
Abstract :
A number of selected measurements which have been used to explore the different characteristics of the perovskite ABO3 relaxors such as PLZT (La-doped lead zirconate titanate), lead scandium tantalate, and lead magnesium niobate are presented. In light of the experimental results, two different models are presented. One is based on compositional heterogeneities, while the other is based on intrinsic instabilities and the broken translation invariance of the lattice. A comparison of the two models shows that it is extremely difficult to distinguish between the two models
Keywords :
dielectric relaxation; ferroelectric materials; ferroelectric transitions; lanthanum compounds; lead compounds; magnesium compounds; permittivity; scandium compounds; PLZT; Pb(ScTa)O3; PbLaZrO3TiO3; PbMgO3NbO3; broken translation invariance; compositional heterogeneities; diffuse phase transition; intrinsic instabilities; lattice; perovskite ABO3 relaxors; relaxor behavior; Composite materials; Dielectric constant; Dielectric measurements; Ferroelectric materials; Fluctuations; Frequency; Gaussian distribution; Optical polarization; Solid modeling; Temperature measurement;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300628
