The Korean Journal of Ceramics

한국세라믹학회 (The Korean Ceramic Society)
권호 표지

Zinc Vacancy Ordering in BaTEX>$(Zn_1/3Ta2/3)O_3$Ceramics

  • Park, Seong-Jin (Department of Materials Science and Engineering, Korea University) ;
  • Sahn Nahm (Department of materials Science and Engineering, Korea University) ;
  • Kim, Myong-Ho (Department of Materials Science and Engineering, Changwon National University) ;
  • Byun, Jae-Dong (Department of Materials Science and Engineering, Changwon National University)
  • 발행 : 1996.12.01
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초록

The microstructure of $Ba (Zn_{1/3}Ta_{2/3})O_3$ (BZT) was investigated using X-ray diffractometry(XRD) and transmission electron microscopy (TEM). $Ba_{0.5}TaO_3$ and $Ba_3TaO_{5.5}$ (BT) phasses were observed on the surface of the sintered specimen by XRD. Furthermore, a new type of ordering along the [110] direction was found in sintered specimen by the XRD and TEM analysis. The wavelength of ordering was 0.9 nm which is three times larger than the interplanar distance of (110) plane and new type of ordering is considered to be a result of Zn vacancy ordering. The creation of Zn vacancies and formation of BT phases are attributed to the evaporation of volatile ZnO. A new mechanism for ZnO loss is suggested. In this mechanism, only Zn vacancies are created only when the amount of ZnO loss is small and as the amount of ZnO loss increases, BT phases are formed at the same time. A new unit cell of ordered structure is suggested as the superlattics containing three BZT unit cells.

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참고문헌

  1. Inorg. Chem. v.2 no.3 Ordering in Compounds of the $A(B'_{0.33}B"_{0.67}$O₃Type F. Galasso;J. Pyle
  2. Acta Cryst. v.B 32 A Powder Neutron and X-ray Diffraction Determination of the Structure of Ba₃Ta₂$O_9$: an Investigation of Perovskite Phases in the System Ba-Ta-Zn-O and the Preparation of $Ba_2TaCdO_{5.5}$ and $Ba_2CeInO_{5.5}$ A. J. Jacobson;B. M. Collins;B. E. F. Fender
  3. J. Am. Ceram. Soc. v.66 no.6 Ba$(Zn_{1/3}Ta_{2/3})O_3$ Ceramics with Low Dielectric Loss at Microwave Frequencies S. Kawashima;M. Nishida;I. Ueda;H. Ouchi
  4. J. Am. Ceram. Soc. v.68 no.10 Microwave Loss Quality of $BaZn_{1/3}Ta_{2/3}O_3$ Ceramics S. B. Desu;H. M. O'Bryan
  5. J. Am. Ceram. Soc. v.75 no.7 Crystal Structure and Microwave Dielectric Properties of $Ba(Zn_{1/3}Ta_{2/3})O_3$-(Sr,Ba)$(Ga_1/2Ta_{1/2})O_3$ Ceramics K. Kageyama
  6. Am. Ceram. Soc. Bull. v.72 no.5 Influence of ZnO Evaporation on Microwave Dielectric Loss and Sinterability of $Ba(Zn_{1/3}Ta_{2/3})O_3$ Ceramics S. Kawashima