Journal
PHASE TRANSITIONS
Volume 81, Issue 11-12, Pages 1013-1021Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411590802457888
Keywords
barium titanate; relaxor ferroelectrics; dielectric spectroscopy; polar nanoregions; random fields; domain walls
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Funding
- European Community within STREP [NMP3-CT-2006-032616]
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Dielectric relaxation of BaTi1-xSnxO3 ceramics is investigated by means of dielectric spectroscopy. The gradual crossover from ferroelectric to relaxor behavior is characterized by vanishing of the contribution due to domain walls and appearance of relaxation related to reorientation of polar nanosized regions. Typical behavior of relaxors is observed only in ceramics with x = 0.30, while the compositions with 0.175 x 0.25 show coexistence of both ferroelectric and relaxor features. The relaxor properties are supposed to be due to both weak random fields and disorder inherent in pure BaTiO3.
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