Paper Title:
Microstructure Characteristics in the BaTiO3-La2O3-Nb2O5 Ternary System
  Abstract

A series of powders of (Ba1-xLa2x/3)(Ti1-xNb4x/5)O3 (0.05≤x≤0.3) have been synthesized by solid-state reaction route, and the effects of the dopants on the microstructure of BaTiO3 were investigated by XRD, SEM, HTEM and EDS in the BaTiO3-La2O3-Nb2O5 ternary system. It was found that the secondary titanium-rich phase occurred for x ≤ 0.1, while Ba3La3Ti5Nb5O30 yields as secondary phase for x ≥ 0.2. In the whole range of 0.05 ≤ x ≤ 0.3, the crystal structure of BaTiO3 solid solutions is cubic system. There are two substitution modes in the system: the substitution mode of La ions dissolved into Ba sites is significant for x ≤ 0.2, but the substitution mode of Nb ions dissolved into Ti sites is significant for x>0.2. TEM observation and EDS analysis revealed that the concentration gradient of Nb existed and La almost distributed homogeneously in a grain. Thus, the dielectric materials composed of La-Nb-codoped BT are not fitted to form the core-shell structure for the higher dopants.

  Info
Periodical
Key Engineering Materials (Volumes 336-338)
Edited by
Wei Pan and Jianghong Gong
Pages
177-180
DOI
10.4028/www.scientific.net/KEM.336-338.177
Citation
Y. H. Wang, T. Wang, S. K. Shi, J. H. Shen, J. Zhou, "Microstructure Characteristics in the BaTiO3-La2O3-Nb2O5 Ternary System", Key Engineering Materials, Vols. 336-338, pp. 177-180, 2007
Online since
April 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hua Zhou, Qingchi Sun, Cuimin Lu
Abstract:Praseodymium (Pr) modified lead zirconate titanate ceramics (Pb1-1.5xPrx (ZryTi1-y) O3 with x = 0.02, 0.04, 0.06, 0.08 and y = 0.51, 0.52,...
211
Authors: Ming Zhao, Wei Min Wang, Xiang Chun Liu, Chang Sheng Tian
Abstract:The effects of pre-synthesized V2O5/Sb2O3 compound, SbVO4 and Sb2O3 on the microstructure and electrical properties of ZnO-V2O5 based...
735
Authors: Tian Wang, Xiao Hui Wang, Guo Feng Yao, Yi Chi Zhang, Xun Xun Liao, Gang Yang, Tae Ho Song, Long Tu Li
Abstract:Ultrafine-grained ceramics based on nano-scale barium titanate for BME-MLCC applications have been prepared. Relationships of milling time,...
43
Authors: Zheng Bo Shen, Xiao Hui Wang, Hui Ling Gong, Long Tu Li
Chapter 3: Functional Ceramics
Abstract:Ba0.95Ca0.05Ti0.85Zr0.15O3 (BCTZ) dielectric ceramics were fabricated by traditional...
728