Influence of Crystallization Temperature on Structural, Ferroelectric, and Ferromagnetic Properties of Lead-Free Bi0.5(Na0.8K0.2)0.5TiO3 Multiferroic Films

Lead-free Bi0.5(Na0.8K0.2)0.5TiO3 (abbreviated as BNKT) films have been synthesized via a sol-gel technique on Pt/Ti/SiO2/Si substrates, and the dependence of the physical properties in BNKT films were investigated as a function of the crystallization temperature. The BNKT films were annealed at dif...

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Bibliographic Details
Published in:Advances in materials science and engineering 2019-01, Vol.2019 (2019), p.1-8
Main Authors: Nguyen, Minh-Duc, Hung, Vu Ngoc, Toan, Tran Quoc, Quan, Ngo Duc
Format: Article
Language:English
Subjects:
Crystallization
Dependence
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Ferromagnetic materials
Lead free
Magnetism
Nitrates
Perovskites
Physical properties
Silicon dioxide
Silicon substrates
Sol-gel processes
Solid phases
Thin films
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Summary:Lead-free Bi0.5(Na0.8K0.2)0.5TiO3 (abbreviated as BNKT) films have been synthesized via a sol-gel technique on Pt/Ti/SiO2/Si substrates, and the dependence of the physical properties in BNKT films were investigated as a function of the crystallization temperature. The BNKT films were annealed at different temperatures (600, 650, 700, and 750°C) for 60 min in the air. The results of this study showed that the optimal crystallization temperature is 700°C. At this, the BNKT films exhibited a single perovskite phase structure and high-dense surface. Besides, the remanent (Pr) and maximum (Pm) polarization reached their highest values of 9.2 µC/cm2 and 30.6 µC/cm2, respectively. All the films showed a weak ferromagnetic behavior with the maximum saturated magnetization (Ms) of 2.1 emu/cm3. These values are equivalent to the highest Pr and Pm values in previous reports on lead-free films.
ISSN:1687-8434
1687-8442
DOI:10.1155/2019/8976385