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Giant dielectric constant and tunable phase‐transition characteristics of ZnF 2 /BaF 2 ‐modified BaTiO 3 thick films
Author(s) -
Key Sung Hun,
Oh Hyo Chan,
Han Chan Su,
Cho Yong Soo
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13138
Subject(s) - dielectric , materials science , capacitor , analytical chemistry (journal) , curie temperature , high κ dielectric , ferroelectricity , condensed matter physics , optoelectronics , electrical engineering , ferromagnetism , voltage , chemistry , physics , chromatography , engineering
High performance capacitors have been investigated to meet higher integration density with optimized charge‐storing capability. Here, we introduce nonconventional thick film dielectric compositions based on 95BaTiO 3 – x ZnF 2 –(2− x )BaF 2 –3glass ( x = 0.5, 1.0, and 1.5) where the relative content of ZnF 2 /BaF 2 is critical in controlling dielectric behavior. The thick films were prepared on Cu foils by regular screen‐printing and then firing at 950°C in inert atmosphere. As an optimal example, thick film composition modified with 1.0ZnF 2 /1.0BaF 2 exhibited a dielectric constant of ~1903 and a dielectric loss of ~0.04 at 1 MHz with dispersive dielectric relaxation behavior, which are far better than any reported corresponding values so far. Particularly, it was very interesting to observe that Curie temperature was tunable from −19 to +34°C, depending on the relative content of fluoride additives only within the 2 mol% range. Dependency of the relative contents of the fluorides is primarily investigated with regard to microstructure and dielectric properties.