The influence of mechanical activation on the electrical properties of Ba0.77Sr0.23TiO3

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The influence of mechanical activation on the electrical properties of Ba0.77Sr0.23TiO3

Authors
Keywords
  • Sintering
  • Electrical Properties
  • Ceramic Materials
  • Mechanical Activation
  • Barium Strontium Titanate

Abstract

Slide 1 Abstract Ferroelectric ceramic barium strontium titanate (Ba0,77Sr0,23TiO3),BST, was prepared by solid-state reactions using starting powders of barium carbonate (BaCO3), strontium carbonate (SrCO3) and titanium dioxide (TiO2-anatase).Non-activated and mechanically activated mixture of high-energy planetary ball mill (0, 5, 10, 20, 40, 80 and 120 minutes) were sintered at 1100, 1200, 1300 and 1400 °C for 2 h in air. The maximum value of ceramic density is about 86.20% TG. Defects and the beginning of sintering process on the microstructure was investigated by scanning electron microscopy (SEM). Electrical measurements (loss tangent of the angle and influence the activation time dependence of XC=f(log ν)) are made of ceramics sintered at 1400 °C for 2 h. 2 4 6 10 2 10 3 10 4 grain for 0 min grain boundaries 80 and 120 min border of agglomeration 0 and 10 min X C [ ] log ([Hz]) 0 min 5 min 10 min 20 min 80 min 120 min 410 o C 2 4 6 10 3 10 4 X C [  ] log ([Hz]) 0 min 5 min 10 min 20 min 80 min 120 min 360 o C a b c d 0 20 40 60 80 100 120 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 tg  t [ o C]  = 1 kHz  = 10 kHz Fig. 1. Scanning electron micrographs of: a) BST-S-0, б) BST-S-20, c) BST-S-80 and d) BST-S-120 sintered at 1400 оC for 2h Advanced Ceramics and Application II , 30.09.-1.10.2013. Belgrade, Serbia Fig. 2. Influence activation time dependence: XC=f(log ν) at a temperature of 360 oC and 410 oC Conclusion -In this paper, the influence of mechanical activation on the electrical properties of Ba0,77Sr0,23TiO3 ceramics was investigated. -Also, the mechanical activation of the starting powder for 120 min can reduce the sintering temperature of around 100 oC, which leads to significant energy savings. -From the point of dielectric loss was found that the optimal duration of

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