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Findings from Military University of Technology Broaden Understanding of Physics Research (The Influence of Microstructure and Lattice Strain on...

September 2, 2014



Findings from Military University of Technology Broaden Understanding of Physics Research (The Influence of Microstructure and Lattice Strain on Tetragonality Factor and Dielectric Properties of Ferroelectric Ceramics BaTiO3)

By a News Reporter-Staff News Editor at Physics Week -- Fresh data on Physics Research are presented in a new report. According to news reporting originating from Warsaw, Poland, by VerticalNews correspondents, research stated, "This work is devoted to direct process of molten salt synthesis and studies on barium titanate (BaTiO3, BT), belonging to ferroelectric crystal group type perovskite BO3. This material thanks to its noncentrosymmetric, fully tetragonal structure possesses at room temperature (up to T-c = 135 degrees C) the spontaneous polarization."

Our news editors obtained a quote from the research from the Military University of Technology, "Due to this fact BT can be applied as piezoelectric material in electromechanical transducers, so as an excellent dielectric in multilayer capacitors and many other devices. With grain size reduction of BT ceramics to nanometric level it leads to permanent transformation into paraelectric state with minimized energy and to lose its specific features as a consequence, even at room temperature. In case of structural agent, means as tetragonality factor, it has a crucial influence on investigated material properties and it is referred in current paper. It is a row of complementary researching methods allows to confirm the presence of desired tetragonal BT phase in nano or micropowders obtained by means of molten salt synthesis route. For different temperature variants of synthesis X-ray diffraction analysis were undertaken and precise unit cells parameters both with tetragonality factor were determined using the Cohen method. Based on structural studies the lattice strains and crystallite sizes were estimated through the Williamson-Hall method. Using scanning electron microscopy the powders morphology and grain size distribution were done."

According to the news editors, the research concluded: "Dielectric measurements of sintered BT ceramics were carried out to determine the Curie temperatures, dielectric permittivities and loss factors in prepared capacitors."

For more information on this research see: The Influence of Microstructure and Lattice Strain on Tetragonality Factor and Dielectric Properties of Ferroelectric Ceramics BaTiO3. Acta Physica Polonica A, 2013;124(6):1034-1038. Acta Physica Polonica A can be contacted at: Polish Acad Sciences Inst Physics, Al Lotnikow 32-46, Pl-02-668 Warsaw, Poland.

The news editors report that additional information may be obtained by contacting M.J. Chrunik, Military Univ Technol, Dept. of Adv Mat & Technol, PL-00908 Warsaw, Poland. Additional authors for this research include S. Klosowicz, P. Perkowski, M. Mrukiewicz, P. Moravviak and D. Zasada.

Keywords for this news article include: Warsaw, Poland, Europe, Physics Research

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Source: Physics Week


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