1. Effect of substitution of Nd3+ for Bi3+ on the dielectric properties and structures of SrBi2-χNdχNb2O9 bismuth layer-structured ceramics.
- Author
-
Sun, Lin, Feng, Chude, Chen, Lidong, and Huang, Shiming
- Subjects
CERAMICS ,STRONTIUM ,BISMUTH ,NEODYMIUM ,NIOBIUM ,DIELECTRIC devices - Abstract
Single phases of SrBi
2-χ Ndχ Nb2 O9 (χ=0, 0.1, 0.2, and 0.4) ceramics were prepared by the solid-state reaction method and studied by dielectric and Raman spectroscopy. The substitution of Nd3+ for Bi3+ induced a dielectric relaxation behavior for SrBi2-χ Ndχ Nb2 O9 (χ=0.1, 0.2, and 0.4). When χ=0.4, the dielectric response of SrBi1.6 Nd0.4 Nb2 O9 is characteristic of typical relaxor ferroelectrics, which could be attributed to the disorder induced by the Nd3+ substituting for Bi3+ in Bi2 O2 layers. The dielectric relaxation of SrBi1.6 Nd0.4 Nb2 O9 was fitted using the Vögel-Fulcher relationship, which indicates that SrBi1.6 Nd0.4 Nb2 O9 is analogous to a spin glass with thermally activated polarization fluctuations above a static freezing temperature. Raman spectra of SrBi2-χ Ndχ Nb2 O9 ceramics could indicate that the structural distortion of NbO6 octahedron decreases with the increase in Nd content, which results in the decrease in Tm for SrBi2-χ Ndχ Nb2 O9 ceramics. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF