서지주요정보
$(1-x)Pb(Yb_{1/2}Ta_{1/2})O_3-xPbZrO_3$ 고용계에서의 상전이 거동 = The Phase Transition Behaviors of $(1-x)Pb(Yb_{1/2}Ta_{1/2})O_3-xPbZrO_3$
서명 / 저자 $(1-x)Pb(Yb_{1/2}Ta_{1/2})O_3-xPbZrO_3$ 고용계에서의 상전이 거동 = The Phase Transition Behaviors of $(1-x)Pb(Yb_{1/2}Ta_{1/2})O_3-xPbZrO_3$ / 황태희.
저자명 황태희 ; Hwang, Tae-Hee
발행사항 [대전 : 한국과학기술원, 2002].
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8012931

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 02040

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초록정보

The phase transition behaviors of $(1-x)Pb(Yb_{1/2}Ta_{1/2})O_3-xPbZrO_3$ [(1-x)PYT-xPZ] solid solution system(0.0≤x≤0.40) have been investigated by dielectric permittivity, X-ray diffraction pattern, E-P hysteresis, and transmission electron microscopy(TEM) measurements. A highly ordered complex perovskite oxide, PYT shows two successive phase transitions, in which the first one is a normal-type paraelectric-antiferroelectric transition at 310℃ and the other is a frequency-dependent antiferroelectric-ferroelectric transition near 186℃. As the composition of PZ increases, the dielectric response of (1-x)PYT-xPZ system is classified into two groups. But macroscopic structural changes in XRD patterns are not observed so the structure of (1-x)PYT-xPZ system remains monoclinic at room temperature. For x≤0.10, the phase transition behavior is similar to that of pure PYT. However, the temperature decrease of the secondary transition with frequency dispersion is more rapid than that of the PE-AFE primary transition. As $Zr^{4+}$ ion concentration increases, antiferroelectricity becomes predominant below the secondary transition and higher-order incommensurate superlattice reflections are obtained from selected area electron diffraction patterns(SAEDP). This may be interpreted as either strong coupling of antiferroelectric and ferroelectric domains as in PZST or randomly interacting dipole as in RADP system. In the composition range of 0.15≤x≤0.40, only the primary transition emerges, where the dielectric constant maximum increases and its temperature, $T_m$ decreases. For x=0.25, the transition becomes broad and it coincides with the disappearance of superlattice lines of B-site cation ordering ($Yb^{3+}$, $Ta^{5+}$, and $Zr^{4+}$ ions) in XRD patterns. But their behaviors are different from those of relaxors.

서지기타정보

서지기타정보
청구기호 {MMS 02040
형태사항 vii, 94 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Tae-Hee Hwang
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 91-94
주제 강유전체
페롭스카이트
부정합
완화형
전자현미경
ferroelectrics
perovskite
incommensurate
diffuse
TEM
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