Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Structural Studies of $A^{2+}$(Mg$_{1/3}$Nb$_{2/3}$)O$_3$,(A$^{2+}$=Sr$^{2+}$ and $Ca^{2+}$) Ceramics using High Resolution Transmission Electron Microscopy

고분해능 투과전자현미경을 이용한 $A^{2+}$(Mg$_{1/3}$Nb$_{2/3}$)O$_3$,(A$^{2+}$=Sr$^{2+}$ and $Ca^{2+}$) 세라믹스의 구조연구

  • Ryu, Hyun (Department of Materials Science and Engineering, Korea University) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University) ;
  • Byun, Jae-Dong (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Hwack-Joo (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Park, Hyun-Min (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science)
  • 류현 (고려대학교 재료공학과) ;
  • 남산 (고려대학교 재료공학과) ;
  • 변재동 (고려대학교 재료공학과) ;
  • 이확주 (한국표준과학연구원 물질량표준부) ;
  • 박현민 (한국표준과학연구원 물질량표준부)
  • Published : 1999.07.01
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Abstract

The crystal structure of A2+(Mg1/3Nb2/3)O3,(A2+=Sr2+ and Ca2+)ceramics was studied usig X-ray diffraction (XRD) and high resolution transmission electrion microscopy(HRTEM). Ba(Mg1/3Nb2/3)O3 (SMN) has the 1:2 ordered monoclinic structure which has the anti-phase tilt of octahedra. The type of tilting in SMN was considered to be a$^{\circ}$a$^{\circ}$c- or a­a­c$^{\circ}$ Ca(Mg1/3Nb2/3)O3 (CMN) also has the 1:2 ordered monoclinic structure which was distorted by the anti-phase tilt or in-phsae tilt of octahedra. A unit cell containing both the in-phase tilt axis and anti-phase tilt axis was not observed in the CMN. Therefore CMN has the mixed phase consisting of the 1:2 ordered monoclinic phase with anti-phase tilt of octahedra and the one with in -phase tilt of ocatahedra,. The anti-parallel shift of cation was also observed in the CMN.

Keywords

References

  1. Electronic Ceramics W. Wersing
  2. Acta Cryst v.B28 The Classification of Tilted Octahedra in Perovskites A.M. Glazer
  3. Acta Cryst v.A31 Simple Ways of Determining Perovskite Structure A.M. Glazer
  4. Ferroelectrics v.20 The Sequences of Structural Phase Transitions in Perovskites K.S. Aleksandrov
  5. Ferroelectrics v.20 Mechnism of the Ferroelectric and Structural Phase Transitions, Structural Distortions in Perovskites K.S. Aleksandrov
  6. J. Appl. Phys. v.74 no.5 Effect of Structural Changes in Complex Perovskites on the Temperature Coefficient of the Relative Permittivity E.L. Colla;I.M. Reaney;N. Setter
  7. Jpn. J. Appl. Phys. v.33 Dielectric and Structural Characteristics of Ba- and Sr- Based Complex perovskites as a Function of Tolerance Factor I.M. Reaney;E.L. Colla;N. Setter
  8. Acta Cryst v.B53 Octahedral Tilting in Perovskites I. Geometrical Considerations P.M. Woodward
  9. Jpn. J. Appl. Phys. v.36 Structural Changes in Ba($Sr_{1/3}Ta_{2/3}$)O-Type Perovskite Compounds upon Tilting of Oxygen Octahedra T. Nagai;M. Sugiyama;M. Sando;K. Nihara
  10. Jpn J. Appl. Phys. v.33 Dielectric Properties of Ca-Based Complex Perovskite at Microwave Frequencies H. Kagata;J. Kato
  11. School of Physics User's Guide to Program DBWS-9411 R.A. Young;A. Sakthivel;T.S. Moss;C.O. Paiva-Santos