[PDF]  https://doi.org/10.3952/physics.v60i4.4358

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 60, 225–234 (2020)
 

IN SEARCH OF AN ARTIFICIAL MORPHOTROPIC PHASE BOUNDARY: LEAD FREE BARIUM TITANATE BASED COMPOSITES
Sergejus Balčiūnasa, Maksim Ivanova, Jūras Banysa, Shintaro Uenob, and Satoshi Wadab
a Faculty of Physics, Vilnius University, Saulėtekio 9-III, 10222 Vilnius, Lithuania
b Integrated Graduate School of Medicine, Engineering and Agricultural Sciences, University of Yamanashi, Kofu, Yamanashi 400-8510, Japan
Email: sergejus.balciunas@ff.vu.lt

Received 3 September 2020; revised 27 October 2020; accepted 27 October 2020

Broadband dielectric spectroscopy was used to study potassium niobate (KN) and barium titanate (BT) core–shell-like composites. KN shell was obtained using a solvothermal reaction method. High frequency results show a huge anomaly that is associated with electro-mechanical coupling. We tried to extract spontaneous polarization values using a theoretical model. We also observed little or no evidence of KN-related phase transitions in the dielectric spectra, although infrared measurements showed typical KN spectral features. Furthermore, we show that a small change in the sintering process allows tuning of dielectric permittivity by an order of magnitude.
Keywords: ferroelectricity, barium titanate, core–shell, composites, dielectric measurements, electromechanical resonance

DIRBTINĖS MORFOTROPINĖS FAZIŲ SANDŪROS BEIEŠKANT: BEŠVINIAI KOMPOZITAI BARIO TITANATO PAGRINDU
Sergejus Balčiūnasa, Maksim Ivanova, Jūras Banysa, Shintaro Uenob, Satoshi Wadab

a Vilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
b Yamanashi universiteto Tarpdisciplininė medicinos ir inžinerijos aukštoji mokykla, Kofu, Japonija
Naudojant plačiajuostės dielektrinės spektroskopijos metodikas buvo ištirti kalio niobato (KN), bario titanato (BT) kevalo ir branduolio kompozitai. Šie kompozitai buvo susintetinti solvoterminės reakcijos metodu. Dielektriniame spektre, esant aukštiems dažniams (108–1011 Hz), stebima didžiulė anomalija, kuri siejama su elektromechaniniu rezonansu. Nedidelis sintezės proceso pokytis gali daryti įtaką dielektriniams spektrams, jis leidžia derinti dielektrinės skvarbos vertes. Taip pat buvo tyrinėjamos spontaninės poliarizacijos vertės naudojant teorinius modelius. Galiausiai parodoma, kad kevalo ir branduolio kompozitai turi aukštesnes spontaninės poliarizacijos vertes.
 
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