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Microstructural and high temperature dielectric, ferroelectric and complex impedance spectroscopic properties of BiFeO3 modified NBT-BT lead free ferroelectric ceramics.

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Title: Microstructural and high temperature dielectric, ferroelectric and complex impedance spectroscopic properties of BiFeO3 modified NBT-BT lead free ferroelectric ceramics.
Authors: Sameera Devi, Ch1, Kumar, GS1, Prasad, G1, Buchi Suresh, M2
Source: Materials Science & Engineering: B. Feb2018, Vol. 228, p38-44. 7p.
Subjects: Ferroelectric crystals, Dielectrics, Microstructure, Electric conductivity, X-ray diffraction
Abstract: Solid solutions of nano structured Na 0.5 Bi 0.5 TiO 3 -Ba 0.925 Nd 0.05 TiO 3 -BiFeO 3 (0.7NBT-0.2BT1-0.1BF & 0.7NBT-0.1BT1-0.2BF) compositions were prepared by the conventional sol-gel method and the effect of BiFeO 3 addition on microstructure, dielectric, ferroelectric and high temperature electrical properties of NBT-BT1-BF ceramics were investigated through XRD, SEM, dielectric and electrical characterization. X-ray diffraction patterns are well indexed and found that samples are crystallized in rhombohedral phase. SEM images have shown uniform distribution of grains and change in grain size with BiFeO 3 concentration. The samples exhibited relaxor behavior, which is accompanied by a shift in ε max and Z'' towards high temperature with increasing BiFeO 3 concentration. The grain and grain boundary response as well as the relaxation processes at different frequencies and temperatures were discussed. These observations suggest that BiFeO 3 addition to NBT-BT1 ceramics can be considered as a potential lead free ceramic system in multi-ferroic devices. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Solid solutions of nano structured Na 0.5 Bi 0.5 TiO 3 -Ba 0.925 Nd 0.05 TiO 3 -BiFeO 3 (0.7NBT-0.2BT1-0.1BF & 0.7NBT-0.1BT1-0.2BF) compositions were prepared by the conventional sol-gel method and the effect of BiFeO 3 addition on microstructure, dielectric, ferroelectric and high temperature electrical properties of NBT-BT1-BF ceramics were investigated through XRD, SEM, dielectric and electrical characterization. X-ray diffraction patterns are well indexed and found that samples are crystallized in rhombohedral phase. SEM images have shown uniform distribution of grains and change in grain size with BiFeO 3 concentration. The samples exhibited relaxor behavior, which is accompanied by a shift in ε max and Z'' towards high temperature with increasing BiFeO 3 concentration. The grain and grain boundary response as well as the relaxation processes at different frequencies and temperatures were discussed. These observations suggest that BiFeO 3 addition to NBT-BT1 ceramics can be considered as a potential lead free ceramic system in multi-ferroic devices. [ABSTRACT FROM AUTHOR]
ISSN:09215107
DOI:10.1016/j.mseb.2017.11.005