서지주요정보
La이 치환된 $Pb[(Yb_{1/2}Nb_{1/2})_{0.88} Ti_{0.12}]O_3$ relaxor 물질의 상전이에 대한 연구 = Structural phase transition in La-substituted $Pb[(Yb_{1/2}Nb_{1/2})_{0.88} Ti_{0.12}]O_3$ relaxor system
서명 / 저자 La이 치환된 $Pb[(Yb_{1/2}Nb_{1/2})_{0.88} Ti_{0.12}]O_3$ relaxor 물질의 상전이에 대한 연구 = Structural phase transition in La-substituted $Pb[(Yb_{1/2}Nb_{1/2})_{0.88} Ti_{0.12}]O_3$ relaxor system / 임기빈.
저자명 임기빈 ; Im, Ki-Vin
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006531

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 96039

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초록정보

The crystal structure and the phase transition behavior of La-substituted $0.88PbYb_{1/2}Nb_{1/2}O_3[PYN]$-$0.12PbTiO_3[PT]$ ceramics have been investigated by X-ray diffraction, transmission electron microscopy, and dielectric constant measurements. Ceramic 0.88PYN-0.12PT was reported to undergo ferroelectric-paraelectric diffuse phase transition which depends on the applied frequency. The crystal structure of room temperature phase may will be determined considered to be pseudocubic and the presence of ${111}_cubic$ superlattice reflections indicates the ordered arrangement of B-site cations. In this study, the effect of substitution of Pb-site by La atoms has been investigated on the crystal structure and phase transition behaviors. With the increasing La contents, the phase transition becomes relatively sharp, and the transition temperature increased. X-ray and selected area electron diffraction results show that for 0.02≤x≤0.08 (x: content of $LaYbO_3$ in mole%) the room temperature crystal structure is found to be orthorhombic and a superstructure due to the antiparallel displacement of the Pb atoms still remain. Comparing to the previous results of antiferroelectric PYN, we suggest that the La substitution evokes enhancement of antiferroelectricity in the 0.88PYN-0.12PT ceramics.

서지기타정보

서지기타정보
청구기호 {MMS 96039
형태사항 65 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ki-Vin Im
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 64-65
주제 전자요업
강유전체
반강유전체
Ceramics
Ferroelectric
Perovskite
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