서지주요정보
$Pb(Zr,Ti)O_3$세라믹스의 정방정상과 능면체정상의 경계조성에서의 상공존현상 = Phase coexistence phenomena at morphotropic tetragonal and rhombohedral phase boundary in Pb$(Zr,Ti)O_3$ceramics
서명 / 저자 $Pb(Zr,Ti)O_3$세라믹스의 정방정상과 능면체정상의 경계조성에서의 상공존현상 = Phase coexistence phenomena at morphotropic tetragonal and rhombohedral phase boundary in Pb$(Zr,Ti)O_3$ceramics / 천채일.
저자명 천채일 ; Choen, Chae-Il
발행사항 [대전 : 한국과학기술원, 1991].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8001684

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 9114

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Factors to have an effect on the phase coexistence at the morphotropic tetragonal and rhombohedral phase boundary(MPB) of $Pb(Zr,Ti)O_3$ ceramics were investigated. And the packing arrangement of the tetragonal and the rhombohedral phase in the MPB PZT ceramics was studied with transmission electron microscope. Two kinds of PZT ceramics with different chemical homogeneity were prepared by conventional solid state reaction and coprecipitation method. There was coexistence of the tetragonal and the rhombohedral phase over a wide composition range in the PZT ceramics prepared by conventional solid state reaction, but phase coexistence was not observed in coprecipitated PZT ceramics. Therefore compositional fluctuation is considered to be the primary reason of the phase coexistence of the tetragonal and rhombohedral phase in MPB PZT ceramics. Structural phase transformation between ferroelectric tetragonal and rhombohedral state and domain rearrangement by mechanical stress and electric field were examined in $Pb(Zr,Ti)O_3$ ceramics by direct determination through X-ray diffraction analysis and theoretical calculation using phenomenological thermodynamic theory. Tensile stress and/or electric field were calculated to shift MPB. The stable composition range of the phase of which spontaneous strain and spontaneous polarization aligned to the direction of tensile stress and/or electric field was expanded. Mechanical stress applied to MPB PZT ceramics caused domain rearrangement by which polar axes aligned so that a part of the stress was able to be relieved, and structral phase transformation by which the phase coexistence region was broadened. Electric field also rearranged domains of the PZT ceramics. But any change of the phase coexistent composition range by the electric field was not observed in MPB PZT ceramics. Fringe contrast in the bright field and doublet spot splitting in the selected area diffraction pattern, which were the typical characteristics of non-180℃ domain boundaries of ferroelectrics, were observed using transmission electron microscope in a MPB PZT ceramics. And in the other part of the sample triplet spot splitting was also observed, which represented the alternative array of non-180℃ domains of ferroelectric tetragonal and rhombohedral phase. This observation results from the fact that both of single phase regions and the regions which are composed of alternation of tetragonal and rhombohedral domains exist in a MPB PZT ceramics.

서지기타정보

서지기타정보
청구기호 {DMS 9114
형태사항 iv, 115 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Chae-Il Choen
지도교수의 한글표기 : 김호기
지도교수의 영문표기 : Ho-Gi Kim
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 108-115
주제 Ferroelectrics
Phase transformations (Statistical physics)
PZT --과학기술용어시소러스
정방정계 --과학기술용어시소러스
삼방정계 --과학기술용어시소러스
강유전체 --과학기술용어시소러스
Ceramics
상공존
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