Pervskite-type 화합물 LaFe_(1-x)Mn_(x)O_(3)계의 x-선 회절과 Mossbauer 분광법에 의한 연구
(A) study on the perovskite-type compound LaFe_(1-x)Mn_(x)O_(3) system by means of the x-ray diffraction and Mossbauer spectroscopy
- 주제(키워드) Pervskite-type 화합물 , x-선 회절 , Mossbauer 분광법 , 물리학 , Mossbauer
- 발행기관 建國大學校 大學院
- 발행년도 1999
- 학위명 석사
- 학과 물리학과
초록/요약
Crystallographic properties of the perovskite LaFe_(1-x)Mn_(x)O_(3) system (x=0.0, 0.1, 0.2, 0.4) have been investigated by means of x-ray diffraction and Mo¨ssbauer spectroscopy. The structure of the system was found to be orthorhombic distorted perovskite over the whole composition range. The Mo¨ssbauer spectra for x=0.1 and 0.2 at room temperature consist of two Zeeman sextets, one from Fe^(3+) ions at octahedral sites in the neighborhood of Fe^(3+) ion and the other from Fe^(3+) ions in the neighborhood of Mn^(3+) ion. However the spectrum for x=0.4 consists of two Zeeman sextets and a paramagnetic doublet which can be attributed to the electronic relaxation effect.
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ABSTRACT = 1
제1장 서론 = 2
제2장 이론적 배경 = 3
2-1. Mo¨ssbauer effect = 3
2-1-1. 제 2차 도플러 효과 = 5
2-2. 초미세 상호작용 (hyperfine interaction) = 6
2-2-1. 이성질체 이동 (isomer shift) = 7
2-2-2. 전기 사중극자 분열 (quadrupole splitting) = 11
2-2-3. 자기적 초미세 상호작용 (magnetic hyperfine interaction) = 16
2-2-4. 완화 효과 (relaxation effect) = 19
2-3. Perovskite 구조 및 lattico distortion = 20
제3장 실험 = 23
3-1. 시료제조 = 23
3-2. X-선 회절실험 = 23
3-3. Mo¨ssbauer 분광 실험 = 25
제4장 결과 및 논의 = 28
4-1. 결정 구조 . = 28
4-2. Mo¨ssbauer spectrum = 32
제5장 결론 = 41
참고문헌 = 42