서지주요정보
(1-x)Pb$(Yb_{1/2}Ta_{1/2})O_3-xPb(Yb_{1/2}Nb_{1/2})O_3$ 고용계에서의 유전특성 및 상전이 거동 = The dielectric properties and phase transitions of (1-x)Pb$(Yb_{1/2}Ta_{1/2})O_3-xPb(Yb_{1/2}Nb_{1/2})O_3$
서명 / 저자 (1-x)Pb$(Yb_{1/2}Ta_{1/2})O_3-xPb(Yb_{1/2}Nb_{1/2})O_3$ 고용계에서의 유전특성 및 상전이 거동 = The dielectric properties and phase transitions of (1-x)Pb$(Yb_{1/2}Ta_{1/2})O_3-xPb(Yb_{1/2}Nb_{1/2})O_3$ / 이재호.
저자명 이재호 ; Lee, Jae-Ho
발행사항 [대전 : 한국과학기술원, 2001].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8011801

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 01022

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The phase transitions of (1-x)Pb$(Yb_{1/2}Ta_{1/2})O_3-xPb(Yb_{1/2}Nb_{1/2})O_3$ solid solution systems have been investigated by measuring dielectric properties, E-P hysteresis loops, X-ray diffraction patterns (XRD) and its transmission electron microscopy (TEM) images. PYT is a highly ordered complex perovskite oxide, which shows two successive phase transitions; The first one is ferroelectric transition with frequency dispersion near 186℃ and the other is the first order phase transition which undergoes from a paraelectric to antiferroelectric at 310℃. The structure of PYT has not been determined exactly yet. The XRD and TEM results of PYT show that its crystal structure is similar to PYN just below the first phase temperature. But two phases - antiferroelectric and ferroelectric phase coexist below the second transition. Below the second phase transition temperature the ferroelectric phase has been identified by the presence of E-P hysteresis loop. XRD diffraction lines due to Pb-antiparallel shift, TEM spots, however, indicated the antiferroelectric phase below the first transition temperature continue to exist below the second transition as well. As the composition of PYN increases, it has been found that the maximum dielectric constant attributed to the second transition decreases gradually such that the antiferroelectric phase is stabilized. But no apparent changes in XRD line positions are observed on PYN substitution. From the selected area diffraction pattern (SADP), an abnormal phase which is thought to be originated from incommensulate in the Nb-substituted solid solution. This may be interpreted as the local strain change due to the ionic size differences of $Ta^{5+}$ and $Nb^{5+}$ ions makes the incommensulate phase that restrains the ferroelectric phase.

서지기타정보

서지기타정보
청구기호 {MMS 01022
형태사항 62 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Ho Lee
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 61-62
주제 상전이
강유전체
phase transition
ferroelectric
perovskite
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