Author:
Boonlakhorn Jakkree,Suksangrat Punpatsorn,Sarakorn Weerachai,Krongsuk Sriprajak,Thongbai Prasit,Srepusharawoot Pornjuk
Abstract
AbstractA modified sol-gel method was used to successfully produce Na1/2Y1/2Cu3Ti4O12 ceramics with high dielectric permittivity. The dielectric permittivity of Na1/2Y1/2Cu3Ti4O12 ceramics reaches values larger than 104 at room temperature and 1 kHz. Moreover, these ceramics exhibit two distinct thermally induced dielectric relaxations over a broad temperature range. The loss tangent is indeed small, ~0.032–0.035. At low temperatures, dielectric relaxation was attributed to the oxygen vacancy effect, while at high temperatures, it was attributed to grain boundary and sample-electrode contact effects. Our calculations revealed that Y and Na ions are likely to occupy Ca and Cu sites, respectively. As a result, other Cu related phases, especially CuO, were observed at the grain boundaries. Based on our analysis, there is a charge compensation between Na and Y ions in Na1/2Y1/2Cu3Ti4O12. Additionally, the Cu+ and Ti3+ states observed in our XPS study originate from the presence of an oxygen vacancy in the lattice. Last, the primary cause of the enormous dielectric permittivity of Na1/2Y1/2Cu3Ti4O12 ceramics primarily comes from the internal barrier layer capacitor effect.
Funder
Program Management Unit for Human Resources & Institutional Development, Research and Innovation
Research and Graduate Studies of Khon Kaen University
National Research Council of Thailand (NRCT) and Khon Kaen University
Fundamental Fund of Khon Kaen University
Publisher
Springer Science and Business Media LLC
Cited by
3 articles.
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