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논문 기본 정보
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- 2015
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이 논문의 연구 히스토리 (5)
2015
다결정 BaxA1-xTi0.9Fe0.1O₃ (A=Bi3+, La3+)에서의 강유전 및 자기 상전이 현상 분석
김덕현
,
유춘리
,
이보화
한국자기학회 학술연구발표회 논문개요집
2015.11
학술대회자료
다결정 BaxA1-xTi0.9Fe0.1O₃ (A=Bi3+, La3+)에서의 강유전 및 자기 상전이 현상 분석
김덕현
,
유춘리
,
이보화
한국자기학회 학술연구발표회 논문개요집
2015.11
학술대회자료
La이 치환된 다결정 BaTi1-yFeyO₃(y=0.07, 0.1)의 미세구조 분석 및 전자기적 특성 간의 상관관계 연구
김덕현
,
이보화
한국자기학회 학술연구발표회 논문개요집
2015.05
학술대회자료
Study of the multiferroic properties of polycrystalline Ba1-xAxTi0.9Fe0.1O3 (A
김덕현 ; Kim
,
Deok Hyeon
물리학과
2015.01
학위논문
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초록· 키워드
오류제보하기
Study of the multiferroic properties of polycrystalline Ba1-xAxTi0.9Fe0.1O3 (A=Bi3+, La3+) ceramics
In this work, the crystal structure, magnetic and ferroelectric properties of polycrystalline Ba1-xAxTi0.9Fe0.1O3 (A = Bi3+or La3+, and 0 ≤ x ≤ 0.1) ceramics prepared by solid state reaction method were investigated.
We found that the Ba1-xBixTi0.9Fe0.1O3 samples with 2 times heat treatment showed more obvious variations in the physical properties than those with 3 times heat treatment, whereas Ba1-xLaxTi0.9Fe0.1O3 samples with 3 times heat treatment showed more obvious change in the physical properties as compared to those with 2 times heat treatment.
The X-ray diffraction (XRD) patterns showed that as the doping concentration increased, the tetragonal phase of Ba1-xAxTi0.9Fe0.1O3 (T-BTO) was stabilized while the hexagonal phase (6H-BTO) of the doped samples was suppressed. Depending on the doping concentration, the 6H-BTO phase could also disappear completely. The Rietveld refinement analysis confirmed that the Ba1-xBixTi0.9Fe0.1O3 (x ≥ 0.07) samples with 2 times heat treatment and Ba0.9La0.1Ti0.9Fe0.1O3 with 3 times heat treatment didn’t have any impurity phase except the tetragonal phase, additionally doping of either Bi or La ions on the Ba site in BaTi0.9Fe0.1O3 induced distortions of the crystal lattice structure.
All Ba1-xBixTi0.9Fe0.1O3 samples with 2 times heat treatment showed clear magnetic hysteresis (M-H) loop and polarization-electrical field (P-E) loop at room temperature. As the amount of Bi3+ ion increased, the saturated magnetization (Ms) and the paramagnetic contribution [(dM/dH)T] also increased.
The M-H and P-E loops were clearly observed at room temperature from the Ba1-xLaxTi0.9Fe0.1O3 (x ≥ 0.06) samples with 3 times heat treatment. Similarly, Ms and (dM/dH)T also increased as the amount of La3+ ion increased.
Depend on our experimental results, Ba1-xBixTi0.9Fe0.1O3 heat treated twice with x ≥ 0.07 and Ba0.9La0.1Ti0.9Fe0.1O3 heat treated for 3 times were single phased materials which show clear multiferroic properties at room temperature.
In this work, the crystal structure, magnetic and ferroelectric properties of polycrystalline Ba1-xAxTi0.9Fe0.1O3 (A = Bi3+or La3+, and 0 ≤ x ≤ 0.1) ceramics prepared by solid state reaction method were investigated.
We found that the Ba1-xBixTi0.9Fe0.1O3 samples with 2 times heat treatment showed more obvious variations in the physical properties than those with 3 times heat treatment, whereas Ba1-xLaxTi0.9Fe0.1O3 samples with 3 times heat treatment showed more obvious change in the physical properties as compared to those with 2 times heat treatment.
The X-ray diffraction (XRD) patterns showed that as the doping concentration increased, the tetragonal phase of Ba1-xAxTi0.9Fe0.1O3 (T-BTO) was stabilized while the hexagonal phase (6H-BTO) of the doped samples was suppressed. Depending on the doping concentration, the 6H-BTO phase could also disappear completely. The Rietveld refinement analysis confirmed that the Ba1-xBixTi0.9Fe0.1O3 (x ≥ 0.07) samples with 2 times heat treatment and Ba0.9La0.1Ti0.9Fe0.1O3 with 3 times heat treatment didn’t have any impurity phase except the tetragonal phase, additionally doping of either Bi or La ions on the Ba site in BaTi0.9Fe0.1O3 induced distortions of the crystal lattice structure.
All Ba1-xBixTi0.9Fe0.1O3 samples with 2 times heat treatment showed clear magnetic hysteresis (M-H) loop and polarization-electrical field (P-E) loop at room temperature. As the amount of Bi3+ ion increased, the saturated magnetization (Ms) and the paramagnetic contribution [(dM/dH)T] also increased.
The M-H and P-E loops were clearly observed at room temperature from the Ba1-xLaxTi0.9Fe0.1O3 (x ≥ 0.06) samples with 3 times heat treatment. Similarly, Ms and (dM/dH)T also increased as the amount of La3+ ion increased.
Depend on our experimental results, Ba1-xBixTi0.9Fe0.1O3 heat treated twice with x ≥ 0.07 and Ba0.9La0.1Ti0.9Fe0.1O3 heat treated for 3 times were single phased materials which show clear multiferroic properties at room temperature.
목차
1. INTRODUCTION 11.1. Multiferroic materials 11.2. Physical propertis of BaTiO3 31.3. Multiferroic properties of transition metal doped BaTiO3 41.3.1. Mn doped BaTiO3 41.3.2. Fe doped BaTiO3 51.4. The role of A(Bi3+ or La 3+) ion on ABO3 peroveskite structure 111.5. Our Motivation 122. EXPERIMENTAL AND MEASUREMENTS 132.1. Sample preparation 132.2. Crystal structure characterization 152.3. Measurement of the multiferroic properties 163. RESULTS AND DISCUSSION 173.1. Multiferroic properties of Bi3+ doped BaTi0.9Fe0.1O3 173.1.1. X-ray diffration spectra of Bi3+ doped BaTi0.9Fe0.1O3 173.1.2. Magnetic properties of Bi3+ doped BaTi0.9Fe0.1O3 203.1.3. Ferroelectric properties of Bi3+ doped BaTi0.9Fe0.1O3 233.1.4. Rietveld refinment analysis of Bi3+ doped BaTi0.9Fe0.1O3 253.2. Multiferroic properties of La3+ doped BaTi0.9Fe0.1O3 283.2.1. X-ray diffration spectra of La3+ doped BaTi0.9Fe0.1O3 283.2.2. Magnetic properties of La3+ doped BaTi0.9Fe0.1O3 313.2.3. Ferroelectric properties of La3+ doped BaTi0.9Fe0.1O3 343.2.4. Rietveld refinment analysis of La3+ doped BaTi0.9Fe0.1O3 364. CONCLUSION 38REFERENCES 40
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