서지주요정보
Zr이 치환된 $0.5Pb(Yb_{0.5}Nb_{0.5})O_3-0.5PbTiO_3$ 고용계에서의 상전이 거동과 MPB에 대한 열역학적 모델링 = Phase transition behavior and thermodynamic modeling of MPB in Zr-substituted $0.5Pb(Yb_{0.5}Nb_{0.5})O_3-0.5PbTiO_3$ solid solution
서명 / 저자 Zr이 치환된 $0.5Pb(Yb_{0.5}Nb_{0.5})O_3-0.5PbTiO_3$ 고용계에서의 상전이 거동과 MPB에 대한 열역학적 모델링 = Phase transition behavior and thermodynamic modeling of MPB in Zr-substituted $0.5Pb(Yb_{0.5}Nb_{0.5})O_3-0.5PbTiO_3$ solid solution / 구현주.
저자명 구현주 ; Ku, Hyun-Ju
발행사항 [대전 : 한국과학기술원, 2004].
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소장정보

등록번호

8015061

소장위치/청구기호

학술문화관(문화관) 보존서고

MAME 04001

SMS전송

도서상태

이용가능

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반납예정일

초록정보

$0.5Pb(Yb_{0.5}Nb_{0.5})O_3-0.5PbTiO_3[PYN_{0.5}PT_{0.5}]$ is a morphotropic mixture of pseudocubic and tetragonal phases. In this work, the dielectric, piezoelectric and phase transition behavior have been investigated when $PbZrO_3[PZ]$ is substituted near morphotropic $PYN_{0.5}PT_{0.5} [(PYN_{0.5}PT_{0.5})_{1-x}-PZ_x]$ for 0.00 ≤x ≤0.40. In the XRD measurement, the split ferroelectric (400) lines, which is indicative of the structural change, is found to merge into a single cubic line on PZ substitution. The crystal structure of this composition changes from the MPB(pseudocubic and tetragonal phases) to a pseudocubic phase with further $Zr^{4+}$ substitution for x>0.10. The dielectric constant has a maximum value at x=0.05 and its maximum value of the dielectric constant maximum decreases gradually with PZ substitution higher than x>0.05 while the apparent phase transition temperature decreases gradually for the whole composition range 0.00 ≤x ≤0.40. $PYN_{0.5}PT_{0.5}$ undergoes a phase transition well defined by the distinct transition temperature. For the ternary solid solutions of x=0.05 and 0.10, a broad secondary shoulder shows up below the transition temperature in the dielectric constant vs. temperature curve after poling under 30kV/cm at 100℃. The remanent polarization reaches the maximum value $(Pr = 39mC/ ㎠)$ at x=0.05. It decreases, however, with higher PZ substitution for x>0.05. The piezoelectric constant ($d_{33}$) also has the maximum value(~215pC/N) at x=0.05. In addition, morphotropic phase boundary of Zr-substituted $PYN_{0.5}PT_{0.5}$ has been calculated using Landau-Devonshire free energy represented by polynomials of the order parameter(spontaneous polarization).

서지기타정보

서지기타정보
청구기호 {MAME 04001
형태사항 vii, 78 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyun-Ju Ku
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학과명칭변경 : 재료공학과가 신소재공학과로 변경
학위논문 학위논문(석사) - 한국과학기술원 : 신소재공학과,
서지주기 참고문헌 : p. 76-78
주제 강유전체
압전재료
상경계
FERROELECTRICS
PIEZOELECTRICS
MPB
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