서지주요정보
Lanthanum이 치환된 barium sodium niobate 세라믹의 상전이에 관한 연구 = The phase transition in lanthanum modified barium sodium niobate ceramics
서명 / 저자 Lanthanum이 치환된 barium sodium niobate 세라믹의 상전이에 관한 연구 = The phase transition in lanthanum modified barium sodium niobate ceramics / 김기찬.
저자명 김기찬 ; Kim, Key-Chan
발행사항 [서울 : 한국과학기술원, 1989].
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소장정보

등록번호

4105556

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8902

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초록정보

The phase transitions of lanthanum modified barium sodium niobate system has been investigated by the x-ray diffraction, dielectic constant measurements. Specimens are prepared by the conventional mixed method. When lanthanum ions has been substituted for barium ions, a dielectric anomaly, which was not observed so far in the single crystalline $Ba_4Na_2Nb_{10}O_{30}$(BSN) has been found in the vicinity of 300°C. This anomaly is associated with the ferroelastic phase transition. This dielectric anomaly originates from the ferroelastic transition below the ferroelectic transition point, X-ray diffraction of the specimens quenched from the ferroelastic temperature region reveals a superlattice structure composed of two sublattice reflections. However these sublattice reflections exhibit an incommensurate pattern. The incommensurate phase of the specimen quenched from 280°C is a retained incommensurate phase that formed in the temperature region around 280°C. High temperature X-ray diffraction also shows a crystal structure very similar to the quench specimen. This evidence supports so called memory effect of the incommensurate BSN phase.

서지기타정보

서지기타정보
청구기호 {MMS 8902
형태사항 [iv], 54 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Key-Chan Kim
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 53-54
주제 Phase transformations (Statistical physics)
Superlattices as materials.
상전이. --과학기술용어시소러스
초격자. --과학기술용어시소러스
결정 구조. --과학기술용어시소러스
Crystal structures.
유전 상수 측정.
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