Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystal Structure and Microwave Dielectric Properties of (1-x)$NdAlO_3$-$xCaTiO_3$Ceramics

(1-x)$NdAlO_3$-$xCaTiO_3$세라믹스의 결정구조와 마이크로파 유전특성 연구

  • Woo, Chang-Soo (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Min-Han (Department of Materials Science and Engineering, Korea University) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University) ;
  • Choi, Chang-Hack (Advanced Materials Technology) ;
  • Lee, Hwack-Joo (New Materials Evaluation Center, Korea Research Institute of Standards and Science) ;
  • Park, Hyun-Min (New Materials Evaluation Center, Korea Research Institute of Standards and Science)
  • Published : 2000.11.01
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Abstract

(1-x)NdAlO$_3$-xCaTiO$_3$세라믹스의 결정구조와 마이크로파 유전특성을 조사하였다. 시편의 결정구조는 조성에 따라서 변화하였는데, 그 결정구조는 x$\leq$0.1일 때는 능면정(rhombohedral) 구조를, 0.3$\leq$x$\leq$0.7에서는 정방정 (tetragonal) 구조를 그리고, x$\geq$0.7일 때 다시 사방정 (orthorhombic) 구조로 바뀌었다. 또한 (1-x)NdAlO$_3$-xCaTiO$_3$세라믹스에서 이차상의 두 종류가 발견되었다. x$\leq$0.5인 시편에서는 Nd$_4$Al$_2$O$_{9}$상이, x$\geq$0.7인 시편에서는 Al-rich상이 발견되었다. x가 증가함에 따라, 유전율 ($\varepsilon$$_{r}$)과 공진주파수의 온도계수 ($ au$$_{f}$ )가 증가하였고, Q$\times$f 값은 x의 증가에 따라 증가하며, x=0.5일 때 최대값을 얻었다. 그리고 0.3NdAlO$_3$-0.7CaTiO$_3$에서 Q$\times$f=46,000, $\varepsilon$$_{r}$=45 그리고 $\tau$$_{f}$ =-1.5 ppm/$^{\circ}C$의 우수한 마이크로파 유전특성을 얻을 수 있었다.

Keywords

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