서지주요정보
$(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$ 세라믹스에 있어서 결정학적 구조가 고주파 유전 특성에 미치는 영향 = The effect of crystallographic structure on high frequency dielectric properties in $(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$ Ceramics
서명 / 저자 $(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$ 세라믹스에 있어서 결정학적 구조가 고주파 유전 특성에 미치는 영향 = The effect of crystallographic structure on high frequency dielectric properties in $(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$ Ceramics / 정태석.
저자명 정태석 ; Chung, Tae-Serk
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8006597

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 96012

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

$(Pb,Ca)ZrO_3$ ceramics (PCZ) has high dielectric constant, high quality factor and small temperature coefficient of resonant frequency in microwave frequency range. But the basic properties such as crystal structure, phase transition and mechanism of temperature characteristics of dielectric properties were not fully understood. We investigated the crystallographic structure, dielectric properties and sintering behavior of $(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$ ceramics (PCZS) fabricated by mixed oxide method. The crystallographic structure of the PCZS ceramics was refined by X-ray Rietveld method to be orthorhombic, Cmcm space group. the mmm point group of PCZS ceramics was investigated by convergent beam electron diffraction. The loss of PbO during sintering of PCZS ceramics deteriorates the electrical and mechanical properties of specimen. Ca and Sn substitution decrease the loss of PbO. The inhibit of PbO vaporization was effectively achieved by Sn rather than Ca substitution. To adapt the PCZS ceramics to resonators and filters in microwave frequency range, the temperature coefficient of resonant frequency should be precisely controlled. Because the temperature coefficient of resonant frequency is a function of the temperature coefficient of dielectric properties of dielectric constant and linear thermal expansion coefficient of the materials used, the temperature coefficient of dielectric constant was measured and analyzed on the basis of crystallographic structure change. The dielectric constant was decreased as Ca, Sn substitution. It was explained by smaller ionic polarizability of $Ca^{2+}$ and $Sn^{4+}$ than that of $Pb^{2+}$ and $Zr^{4+}$ ions. There were two types of phase transition in the temperature range from -140℃ and 350℃. The phase transition temperature of the PCZS ceramics was changed due to the modifications of crystallographic structure. The nature of these phase transition of PCZS ceramics was the key parameters which controlled the temperature coefficient of dielectric constant.

서지기타정보

서지기타정보
청구기호 {DMS 96012
형태사항 iv, 132 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Tae-Serk Chung
지도교수의 한글표기 : 김호기
지도교수의 영문표기 : Ho-Gi Kim
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 129-132
주제 결정구조
$(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$
마이크로웨이브
유전체
Crystal structure
$(Pb_{1-x}Ca_x)(Zr_{1-y}Sn_y)O_3$
Microwave
Dielectrics
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