Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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An Study on the Structure of Maghemite(${\gamma}$-Fe$_2$O$_3$) II -Lattice Energy Computation and Crystal Structure Analysis-

마게마이트(${\gamma}$-Fe$_2$O$_3$)의 구조에 대한 연구II -격자에너지 계산과 결정구조해석-

  • Published : 1998.11.01
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Abstract

Crystal structure and structural stability of needle-shaped maghemite(${\gamma}$-{{{{ { {Fe }_{2 }O }_{3 } }}) have been studied by the computation and estimation of lattice energies interionic distances and site potentials. The refined struc-tures analyzed with cubic system(space group P4332) and tetragonal system(space group P4332) were used for these computations. The lattice energy of tetragonal system is -143.10eV/molecule. The maghemite structure with tetragonal system is more stable than that with cubic system. The ordering energy of the FE and cation vacancy within the octahedral site the 4b site of the structure with cubic system(space group P4332) is -0.95eV/molecule but this Fe has larger interionic distance and is very unstable.

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References

  1. Solid State Comm. v.22 Vacancy Ordering in${\gamma}-Fe_2O_3$Small Particles K. Haneda;A.H.Morrish
  2. J. Sol. State Chem. v.49 A Powder Neutron Diffranction Investigation of Vacancy Ordering and Covalence in${\gamma}-Fe_2O_3$ C. Greaves
  3. J. Sol. State Chem. v.108 Structural Characteristics of Uniform${\gamma}-Fe_2O_3$Particles with Different Axial (Length/Width)Ratios M.P. Morales;C. Pecharroman;T. Gonzalez Carreno;C. J. Serna
  4. 요업학회지 v.35 no.10 마게마이트$({\gamma-Fe_2O_3$)의 구조에 대한 연구 Ⅰ-분말 X-선 회절무늬의 Rietveld 분석 신형섭
  5. J. Phys. C : Solid State Phys. v.18 Potential Models for Ionic Oxides G.V. Lewis;CR.A. Catlow
  6. Phil. Mag. v.58 no.1 Interatomic Potentials for Oxides C.R.A. Catlow;C.M. Freeman;M.S. Islam;R.A. Jackson;M. Leslie;S.M. Tomlinson
  7. Physica v.113B Damping Factors for the Calculation of the Madelung Constants of Ionic Crystals-Mathematical Relation between Evjen's Method and Euler's Transformation of Series H. Hosoya
  8. 요업학회지 v.31 no.4 산화물의 격자에너지의 새로운 계산방법 신형섭;권순주
  9. J. Phys. Soc. Jpn. v.18 no.1 An Electron Diffraction Study and a Theory of the Transformation from${\gamma}-Fe_2O_3\;to\;{\alpha-Fe_2O_3$ S. Kachi;K. Momiyama;S. Shimizu
  10. Magnetic Oxide Iron Oxides D.J.Craik(Ed.)
  11. J. Sol. State. Chem. v.32 Correlation Between IR Spectra, X-Ray Diffraction and Distribution of Structral Vacanies in$$ Fe^3+[{\delta}Fe^2+_{1-x}Fe^3+_{(1-x)2\deltaM^3+_x]O^2-_4-$$Type Spinels B. Gillot;F. Bouton
  12. Indian J. Chem. v.28A Thermal Stability of Doped γ-Ferric Oxide R. Bhat;M.R. Anantharaman;H.V. Keer
  13. J. Appl. Cryst. v.2 A Profile Refinement Method for Nuclear and Magnetic Structures H.M. Rietveld
  14. J. Phys. Chem. Solids v.46 no.11 Defect Structure and Migration in$Fe_3O_4$ G.V. Lewis;C.R.A. Catlow;A.N. Cormark
  15. Acta. Crystal. v.B25 Effective Ionic Radii in Oxides and Fluorides R D Shannon;C.T Prewitt
  16. 요업학회지 v.30 no.6 분말 X-선 회절법에 의한 페라이트의 구조 연구:헤마타이트, 바륨페라이트,$Zn_2Y(Ba_2Zn_2Fe_12O_22)$ 신형섭;권순주