Thermal Stability and Non-Linear Optical and Dielectric Properties of Lead-Free K 0.5 Bi 0.5 TiO 3 Ceramics.

Autor: Czaja P; Institute of Technology, University of the National Education Commission, Podchorążych 2, 30-084 Krakow, Poland., Szostak E; Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland., Hetmańczyk J; Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland., Zachariasz P; Center for Hybrid Microelectronics and LTCC, Łukasiewicz Research Network-Institute of Microelectronics and Photonics, Zabłocie 39, 30-701 Krakow, Poland., Majda D; Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland., Suchanicz J; Department of Mechanical Engineering and Agrophysics, University of Agriculture in Krakow, Balicka 120, 31-120 Krakow, Poland., Karolus M; Faculty of Science and Technology, Institute of Materials Engineering, University of Silesia in Katowice, 75 Pułku Piechoty 1a, 41-500 Chorzow, Poland., Bochenek D; Faculty of Science and Technology, Institute of Materials Engineering, University of Silesia in Katowice, 75 Pułku Piechoty 1a, 41-500 Chorzow, Poland., Osińska K; Faculty of Science and Technology, Institute of Materials Engineering, University of Silesia in Katowice, 75 Pułku Piechoty 1a, 41-500 Chorzow, Poland., Jędryka J; Faculty of Electrical Engineering, Czestochowa University of Technology, Armii Krajowej 17, 42-201 Czestochowa, Poland., Kityk A; Faculty of Electrical Engineering, Czestochowa University of Technology, Armii Krajowej 17, 42-201 Czestochowa, Poland., Piasecki M; Institute of Physics, Jan Dlugosz University, Armii Krajowej 13/15, 42-200 Czestochowa, Poland.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2024 Apr 29; Vol. 17 (9). Date of Electronic Publication: 2024 Apr 29.
DOI: 10.3390/ma17092089
Abstrakt: Lead-free K 0.5 Bi 0.5 TiO 3 (KBT) ceramics with high density (~5.36 g/cm 3 , 90% of X-ray density) and compositional purity (up to 90%) were synthesized using a solid-state reaction method. Strongly condensed KBT ceramics revealed homogenous local microstructures. TG/DSC (Thermogravimetry-differential scanning calorimetry) techniques characterized the thermal and structural stability of KBT. High mass stability (>0.4%) has proven no KBT thermal decomposition or other phase precipitation up to 1000 °C except for the co-existing K 2 Ti 6 O 13 impurity. A strong influence of crystallites size and sintering conditions on improved dielectric and non-linear optical properties was reported. A significant increase (more than twice) in dielectric permittivity ( ε R ), substantial for potential applications, was found in the KBT-24h specimen with extensive milling time. Moreover, it was observed that the second harmonic generation (λ SHG = 532 nm) was activated at remarkably low fundamental beam intensity. Finally, spectroscopic experiments (Fourier transform Raman and far-infrared spectroscopy (FT-IR)) were supported by DFT (Density functional theory) calculations with a 2 × 2 × 2 supercell ( P 4 2 mc symmetry and C4v point group). Moreover, the energy band gap was calculated ( E g = 2.46 eV), and a strong hybridization of the O-2 p and Ti-3 d orbitals at E g explained the nature of band-gap transition (Γ → Γ).
Databáze: MEDLINE
Nepřihlášeným uživatelům se plný text nezobrazuje