Publication Date:
2016-10-12
Description:
Aurivillius single-phase Bi 4 Ti 2.5 Fe 0.25 Ta 0.25 O 12 ceramics was prepared via high-temperature solid-state reaction method. The detailed structural analysis of the doped Bi 4 Ti 3 O 12 compound was carried out by Rietveld refinement of the full XRD Pattern. Dielectric and electrical properties were studied in a wide range of temperature and frequency by dielectric/impedance spectroscopies. The comprehensive analysis of frequency spectrum reveals the occurrence of two relaxation behaviors in the ceramics at low frequency and high frequency, respectively. A phase transition was observed at ~650°C in Bi 4 Ti 2.5 Fe 0.25 Ta 0.25 O 12 somewhat lower than the ferroelectric transition temperature of Bi 4 Ti 3 O 12 . The possible reason for the decrease of ferroelectric transition temperature was discussed based on the structural analysis. The present results could be useful for designing and/or modifying properties of Bi 4 Ti 3 O 12 -related ceramics.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
