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

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3415.pdf (1.860Mb)
Autori
Kosanović, Darko
Zivojinović, J.
Obradović, N.
Pavlović, Vera P.
Pavlović, Vladimir
Peles, A.
Ristić, M.M.
article (publishedVersion)
Metapodaci
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Apstrakt
Ferroelectric barium strontium titanate (Ba0.77Sr0.23TiO3), BST, was prepared by solid-state reactions using as the starting compounds powder of barium carbonate (BaCO3), strontium carbonate (SrCO3) and titanium dioxide (TiO2 anatase). Non-activated mixtures and mixtures mechanically activated in a high-energy planetary ball mill (0, 5, 10, 20, 40, 80 and 120 min) were sintered at 1100, 1200, 1300 and 1400 degrees C for 2 h in air atmosphere. Defects and the effect of the beginning of the sintering process on the microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements (loss tangent and resistivity as the function of frequency X-C =f(log nu)) were performed for ceramics sintered at 1400 degrees C for 2 h. It has been found that mechanical activation can reduce the sintering temperature by around 100 degrees C, which leads to significant energy savings. Furthermore, activated for 80 min and sintered at. 1400 degrees C for 2 h exhibit the largest de...nsity values and have about 36% lower dielectric loss at a frequency of 1 kHz and about 57% at a frequency of 10 kHz than the samples obtained from the initial non-activated powder sintered under the same conditions.

Ključne reči:
Milling / Sintering / Electrical properties
Izvor:
Ceramics International, 2014, 40, 8, 11883-11888
Izdavač:
  • Elsevier Sci Ltd, Oxford
Finansiranje / projekti:
  • info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172057/RS// (RS-172057)
  • Serbian Academy of Sciences and Arts [F/198]

DOI: 10.1016/j.ceramint.2014.04.023

ISSN: 0272-8842

WoS: 000340328600051

Scopus: 2-s2.0-84903899502
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URI
http://aspace.agrif.bg.ac.rs/handle/123456789/3418
Kolekcije
  • Radovi istraživača / Researchers’ publications
Institucija/grupa
Poljoprivredni fakultet

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