Applied Microscopy

  • 제32권2호
  • /
  • Pages.157-162
  • /
  • 2002
  • /
  • 2287-5123(pISSN)
  • /
  • 2287-4445(eISSN)
한국현미경학회 (Korean Society of Microscopy)
권호 표지

Complex Perovskite $(Na_{1/2}Pr_{1/2})TiO_3$의 미세구조 관찰

Microstructure Observations in Complex Perovskite $(Na_{1/2}Pr_{1/2})TiO_3$

  • 이확주 (한국표준과학연구원 물질량 표준부) ;
  • 류현 (한국표준과학연구원 물질량 표준부) ;
  • 박현민 (한국표준과학연구원 물질량 표준부) ;
  • 조양구 (한국표준과학연구원 물질량 표준부) ;
  • 남산 (고려대학교 공과대학 재료공학부)
  • Lee, Hwack-Joo (New Materials Evaluation Center, Korea Research Institute of Standards and Science) ;
  • Ryu, Hyun (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) ;
  • Cho, Yang-Koo (New Materials Evaluation Center, Korea Research Institute of Standards and Science) ;
  • Nahm, Sahn (Division of Materials and Metallurgical Engineering, Korea University)
  • 발행 : 2002.06.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

복합 페로브스카이트$(Na_{1/2}Pr_{1/2})TiO_3$ (NPT)의 미세구조를 X-ray diffractometry와 투과전자 현미경으로 관찰하였다. NPT는 A-site 양이온에 의한 1 : 1 chemical ordering을 갖고 있지 않으며 산소 팔면체의 antiphase tilting과 inphase tilting 그리고 A-site 양이온의 antiparallel shift가 관찰 되었다. 2차상도 관찰되었으나, 이를 확인하지 못하였다. 측정된 NPT 재료의 유전체 특성은 ${\varepsilon}_r=99.6,\;Q\;{\Large f}_o=1124\;GHz,\;{\tau}_{f}=-233.64ppm/^{\circ}C$이었다.

Microstructural investigations of $(Na_{1/2}Pr_{1/2})TiO_3$ (NPT) complex perovskite compounds were carried out using X-ray diffractometry and transmission electron microscopy. NPT had not 1:1 chemical ordering of Asite cations but had the antiphase and inphase tilting of oxygen octahedron and the antiparallel shift of cations. Both the antiphase boundaries and the ferroelastic domains were not present in the microstructure. Unidentified second phase was found in the microstructure. The measured dielectric properties were ${\varepsilon}_r=99.6,\;Q\;{\Large f}_o=1124\;GHz,\;{\tau}_{f}=-233.64ppm/^{\circ}C$.

키워드

참고문헌

  1. Colla EL, Reaney IM, Setter N: Effect of Structural Changes in Complex Perovskites on the Temperature Coefficient of the relative Permittivity. J Appl Phys 74:3414-3425, 1993 https://doi.org/10.1063/1.354569
  2. Glazer AM: The Classification of Tilted Octahedra in Perovskites. Acta Cryst. B28:3384-3392, 1972 https://doi.org/10.1107/S0567740872007976
  3. Glazer AM: Simple Ways of Determining Perovskite Structures. Acta Cryst. A31:756-762, 1975 https://doi.org/10.1107/S0567739475001635
  4. Hakki BW, Coleman PD: A dielectric resonator method of measuring inductive capacities in the milimeter range. IRE Trans Microwave Theory Tch 8:402-10, 1960 https://doi.org/10.1109/TMTT.1960.1124749
  5. Kagata H, Kato J: Dielectric properties of Ca-based complex perovskite at microwave frequencies. Jpn J Appl Phys 33:5463-5465, 1994 https://doi.org/10.1143/JJAP.33.5463
  6. Kawashima S, Nishida M, Ueda I, Ouchi H: Ba(Zn1/3Ta2/3)O3 Ceramics with Low Dielectric Loss at Microwave Frequencies. J Am Ceram Soc 66[6]:421-23, 1983 https://doi.org/10.1111/j.1151-2916.1983.tb10074.x
  7. Megaw HD: Crystal Structure; A working approach, pp.459-464, W.B. Sanders company, London, 1973
  8. Nagai T, Sugiyama M, Sando M, Niihara K: Structure changes in Ba(Sr1/3Ta2/3)O3-type perovskite compounds upon tilting of oxygen octahedra. Jpn J Appl Phys 36:1146-1153, 1997 https://doi.org/10.1143/JJAP.36.1146
  9. Reaney IM, Colla EL, Setter N: Dielectric and Structural Characterisitics of Ba- and Sr-based Complex Perovskites as a Function of Tolerance Factor. Jpn J Appl Phys. 33, 3984-3990, 1994 https://doi.org/10.1143/JJAP.33.3984
  10. Takahashi H, Baba Y, Ezaki K, Okamoto Y, Shibata K, Kurori K, Nakano S: Dielectric characteristics of (A . A )$TiO_3$ ceramics at microwave frequencies. Jpn J Appl Phys 30[9B]:2339-42, 1991 https://doi.org/10.1143/JJAP.30.2339
  11. Woodward PM: Octahedral tilting in perovskite, I. geometrical considerations. Acta Crystallogr, Sect. B B53:32-43, 1997