Effects of Nb-doping on the micro-structure and dielectric properties of (Bi0.5Na0.5)TiO3 ceramics

Bismuth sodium titanate [(Bi0.5Na0.5)TiO3 or BNT] ceramics incorporated with 0, 1, 5, 10, 15 and 20mol% niobium were prepared by conventional solid state reaction method. The green bodies were sintered at 1050°C for 2h to obtain dense ceramics. The effects of substitution of niobium ion for titanium...

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Published inCeramics international Vol. 39; pp. S113 - S117
Main Authors Petnoi, Napatporn, Bomlai, Pornsuda, Jiansirisomboon, Sukanda, Watcharapasorn, Anucha
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2013
Subjects
A. Sintering
B. X-ray methods
C. Dielectric properties
B. X-ray methods
C. Dielectric properties
A. Sintering
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Summary:Bismuth sodium titanate [(Bi0.5Na0.5)TiO3 or BNT] ceramics incorporated with 0, 1, 5, 10, 15 and 20mol% niobium were prepared by conventional solid state reaction method. The green bodies were sintered at 1050°C for 2h to obtain dense ceramics. The effects of substitution of niobium ion for titanium ion in BNT ceramics on micro-structure and dielectric properties were investigated. X-ray diffraction analysis showed the presence of a secondary phase when more than 5mol% niobium was added. Within the solubility limit, Nb doping caused the grain size of BNTNb to be smaller than the undoped sample. The investigation of the dielectric properties showed that the transition temperature (Tc) was found to shift towards lower temperature as the content of Nb increased. In this research, the donor-type behavior and induced charged defects had significant influence on the electrical properties of Nb-doped BNT ceramics.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2012.10.045