서지주요정보
(Pb, Ba)(Zr,Ti)$O_3$ 계에서의 상전이에 대한 연구 = Phase transition in (Pb,Ba)(Zr,Ti)$O_3$ solid solutions
서명 / 저자 (Pb, Ba)(Zr,Ti)$O_3$ 계에서의 상전이에 대한 연구 = Phase transition in (Pb,Ba)(Zr,Ti)$O_3$ solid solutions / 이재찬.
저자명 이재찬 ; Lee, Jai-Chan
발행사항 [서울 : 한국과학기술원, 1985].
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소장정보

등록번호

4103286

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8535

SMS전송

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초록정보

Phase transition of $(Pb_{1-x}Ba_x)(Zr_{0.4}Ti_{0.6})O_3$ solid solutions which are in the highly disordered state has been investigated. X-ray diffraction patterns of sintered compacts show that tetragonality(c/a) decreases with increasing Ba content. As Ba content increases, phase transition appears more diffuse. Decreasing tetragonality means that oxygen octahedra in the perovskite structure changes from distorted to undistorted shape. As tetragonality decreases, near the transition temperature potential energy curve takes different shape, that is, the potential well depth becomes shallow and the probability that fluctuation of the order parameter occurs becomes larger. The easily excitable fluctuation leads to the local disorder and further causes the local disorder mode to couple the polar lattice mode. As the disregistry of lattice parameter δ(=c/a-1) decreases, phase transition takes more diffuse characteristics. The solid solutions undergoing DPT tend to show large relaxation time whereas those of sharp transition tend to show small relaxation time. From this fact, an attempt was made to explain the dielectric maximum temperature(Tm) shift to high temperature with increasing external frequencies. Hysteresis loop and T.M.A. experiments show that very diffuse transition (x=0.4) appears to be field-induced transition.

서지기타정보

서지기타정보
청구기호 {MMS 8535
형태사항 [iv], 65 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jai-Chan Lee
지도교수의 한글표기 : 주웅길
지도교수의 영문표기 : Woong-Kil Choo
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 63-65
주제 Phase transformations (Statistical physics)
Long range order (Solid state physics)
상전이. --과학기술용어시소러스
규칙도. --과학기술용어시소러스
Tetragonality.
Diffuse phase transition.
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