Investigation on the Correlation between Structural and Electrical Properties of Lanthanum Doped Barium Titanate Ceramics

2016 ◽  
Vol 860 ◽  
pp. 99-104
Author(s):  
Masum Billah ◽  
Md Miftaur Rahman
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Barium Titanate ◽  
Curie Temperature ◽  
Raw Materials ◽  
Structure Property ◽  
Structural And Electrical Properties ◽  
Doped Barium Titanate ◽  
Titanate Ceramics ◽  
Relationship Of

The structure-property relationship of 0.3, 0.5 and 0.7mole% lanthanum (La2O3) doped Barium titanate (BaTiO3) ceramics prepared by solid state sintering under different sintering conditions were investigated in this research. The raw materials were La2O3 (grain size=~80nm) and BaTiO3 (grain size=100nm) powders. Field Emission Scanning Electron Microscope (FE-SEM) was used to examine grain size and surface morphology of sintered pellets & X-Ray Diffraction analysis was conducted to identify crystal structure. The results showed significantly improved grain size and electrical properties of BaTiO3 for 0.5 mole% La2O3 with desired grain size (0.8-1.3μm), high densification (>90% theoretical density) and stable dielectric constant (12700) at room temperature (f=100Hz) by lowering curie temperature around 30oC by sintering at 1300oC for 8 hrs. A gradual deterioration follows with increased doping concentration. So the research revealed that proper La3+ concentration can inhibit grain size and lower Curie temperature hence significantly improving the electrical properties of BaTiO3 ceramics.

Engineering grain size and electrical properties of donor-doped barium titanate ceramics

2011 ◽  
Vol 37 (1) ◽  
pp. 303-311 ◽  
Author(s):  
Krisztian Niesz ◽  
Teyeb Ould-Ely ◽  
Hisashi Tsukamoto ◽  
Daniel E. Morse
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Barium Titanate ◽  
Doped Barium Titanate ◽  
Titanate Ceramics

Effects of phase composition and grain size on the piezoelectric properties of HfO2-doped barium titanate ceramics

2019 ◽  
Vol 54 (19) ◽  
pp. 12392-12400
Author(s):  
Hong-Mei Yin ◽  
Wen-Jun Xu ◽  
Heng-Wei Zhou ◽  
Xing-Yu Zhao ◽  
Yi-Neng Huang
Keyword(s):  
Grain Size ◽  
Phase Composition ◽  
Barium Titanate ◽  
Piezoelectric Properties ◽  
Doped Barium Titanate ◽  
Titanate Ceramics

STRUCTURAL AND ELECTRICAL PROPERTIES OF Nb5+ SUBSTITUTED PZT CERAMICS

2005 ◽  
Vol 19 (30) ◽  
pp. 1783-1791 ◽  
Author(s):  
O. P. THAKUR ◽  
CHANDRA PRAKASH
Keyword(s):  
Grain Size ◽  
Transition Temperature ◽  
Electrical Properties ◽  
Raw Materials ◽  
Pzt Ceramics ◽  
X Ray ◽  
Niobium Doping ◽  
Average Grain Size ◽  
Structural And Electrical Properties ◽  
Sample Structure

The effect of niobium doping on the structure and electrical properties with the following compositions Pb ( Zr 0.52 Ti 0.48)1-5X/4 Nb X O 3 with 0<x<0.025 was investigated. The materials were prepared by the usual ceramic technique using high purity raw materials. Disc-shaped samples of each compositions were sintered at 1250°C for 3 hours. The sample structure was determined by X-ray diffractometry. The average grain size, the maximum dielectric permittivity and the remnant polarization first increases up to x = 0.005 concentration of Nb 5+ and then decreases with higher concentration of niobium, while the coercive field does not show any variation. The transition temperature decreases with the increase in niobium concentration.

Electrical properties of antimony doped barium titanate ceramics

2013 ◽  
Vol 48 (10) ◽  
pp. 3766-3772 ◽  
Author(s):  
M.M. Vijatović Petrović ◽  
J.D. Bobić ◽  
J. Banys ◽  
B.D. Stojanović
Keyword(s):  
Electrical Properties ◽  
Barium Titanate ◽  
Doped Barium Titanate ◽  
Titanate Ceramics

scholarly journals Application of the intergranular impedance model in correlating microstructure and electrical properties of doped BaTiO3

2009 ◽  
Vol 41 (3) ◽  
pp. 247-256 ◽  
Author(s):  
V. Mitic ◽  
V.B. Pavlovic ◽  
Lj. Kocic ◽  
V. Paunovic ◽  
D. Mancic
Keyword(s):  
Electrical Properties ◽  
Barium Titanate ◽  
Fractal Structure ◽  
Frequency Characteristics ◽  
The Other ◽  
Electrical Model ◽  
Impedance Model ◽  
Doped Barium Titanate ◽  
Titanate Ceramics ◽  
Frequency Diagram

Microstructure properties of barium-titanate based materials, expressed in grain boundary contacts, are of basic importance for electric properties of this material. In this study, the model of intergranular impedance applied on a two-grain contact is considered. Globally, a BaTiO3-ceramics sample consists of a large number of mutually contacted grains, which form clusters. Such clusters can be presented as specific fractal formations. For each of them, it is possible to establish the equivalent electrical model and, for a defined set of input parameters, using symbolic analysis, obtain the frequency diagram. The influence of fractal structure is especially stressed. Realizing the totality of relations between cluster grain groups, their microelectrical schemes and corresponding frequency characteristics, on one hand, and the global equivalent electrical scheme and corresponding acquired frequency characteristics of BaTiO3-ceramics samples, on the other hand, we set a goal of correlating experimental results with the summing effect of microelectric equivalent schemes. The model is successfully tested on doped barium-titanate ceramics.

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