121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-531
Subject Enhancement in microwave absorption properties of BaTiO3 particles through oxygen vacancies
Authors Baek kyungnae, Syazwani Binti Mohd Noor1, Jerome Hyun2,*
Department of Chemistry, Ewha Womans University, Korea
1Department of Chemistry and Nano Science, Ewha Womans University, Korea
2Chemistry Department of Nano-Science, Ewha Womans University, Korea
Abstract Managing microwave radiation is essential for preventing electronic malfunction in electronic devices and control systems due to electromagnetic interference. To this end, microwave absorbing materials with high magnetic permeability or high dielectric loss are typically employed. Barium titanate (BaTiO3) is a dielectric material that can be used as an electromagnetic wave absorber when loss mechanisms are incorporated. In this study, we explored the modulation of dielectric loss in BaTiO3 particles through oxygen vacancies. BaTiO3 particles were prepared by the Molten Salt Synthesis (MSS) method. Oxygen vacancies were introduced through synthesis in an oxygen deficient environment. The presence of oxygen vacancies were confirmed using Raman, HRTEM and Electron energy loss spectroscopy (EELS) analysis, and were shown by microwave reflection loss measurements to enhance the dielectric loss value of pristine BaTiO3. Such characterization methods allowed the preclusion of other loss mechanisms arising from grain boundaries, size differences, phase differences and porosity, enabling us to isolate dielectric relaxation through oxygen vacancies as the predominant loss mechanism. These results suggest that oxygen-deficient BaTiO3 can be a promising material for achieving tunable microwave absorption.
E-mail fate7677@naver.com