Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Study of Nonstoichiometry and Physical Properties of the $Nd_{1-x}(Ba_{0.40}Mg_{0.60})_{1+x}FeO_{4-y}$ System

  • Published : 19950300
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Abstract

A series of samples of the Nd1-x(Ba0.40Mg0.60)1+xFeO4-y (x=0.00, 0.10, 0.20, and 0.30) system has been synthesized at 1450 ℃ under an atmospheric air pressure. The x-ray powder diffraction analysis of the solid solutions assigns the structure of all the compositions to orthorhombic system. Mohr salt analysis shows that τ and y values increase with x value and nonstoichiometric chemical formulas of the system can be formulated from the x, τ, and y values. Oxygen vacancies are distributed along c-axis in the perovskite layer. The magnetic ordering temperature remains unchanged with x value. Electrical conductivity and activation energy depend only on the mixed valence state of Fe ion. Conduction mechanism can be suggested as the hopping of electron between eg orbitals of Fe3+ and Fe4+ ions through Fe3+-O-Fe4+ bonds. Magnetic susceptibility and electrical conductivity are discussed with the nonstoichiometric chemical formulas.

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References

  1. Physica C v.192 Hang, H. Y.;Cheong, S. W.;Copper, A. S.;Rupp Jr. L. W.;Batlogg, B.;Kwei, G. H.;Tan, Z.
  2. J. Solid State Chem. v.53 Ganguly, P.;Rao, C. N. R.
  3. Mat. Res. Bull. v.8 Ganguly, P.;Rao, C. N. R.
  4. Z. Anorg. Alleg. Chem. v.476 Flem, L. G.;Courbin, P.;Delmas, C.;Soubeyroux, J.L.
  5. Bull. Kor. Chem. Soc. v.15 no.8 Yo, C. H.;Kim, H. R.;Ryu, K. R.;Roh, K. S.;Choy, J. H.
  6. Bull. Kor. Chem. Soc. v.15 no.7 Roh, K. S.;Ryu, K. S.;Ryu, K. H.;Yo, C. H.
  7. J. Solid State Chem. v.95 Oh-Ishi, K.;Syono, Y.
  8. J. Solid State Chem. v.97 Chen, B. H.;Eichhorn, B. W.;
  9. J. Am. Ceram. Soc. v.71 no.1 Yokokawa, H.;Kawada, T.;Dokita, M.
  10. J. Solid State Chem. v.72 Rao, C. N. R.;Ganguly, P.;Singh, K. K.;Ram, R. A. M.
  11. J. Solid State Chem. v.96 Takeda, Y.;Nishijima, M. Imanishi, N.;Kanno, M.;Yamamoto, O.;Takano, M.
  12. Mat. Res. Bull. v.17 Goodenough, J. B.;Ramasesha, S.
  13. Magn. Lett. v.1 Ganaguly, P.;Kollali, S.;Rao, C. N. R.;Kern, S.
  14. Acc. Chem. Res. v.12 Day, P.
  15. J. Solid State Chem. v.42 Berkoan, R.;Coutures, J. P.;Flem, G. L.;Saux, M.
  16. Physica C v.209 Yang, H. D.;Meen, T. H.;Chen, Y. C.
  17. Magnetochemistry (2nd ed) Selwood, P. W.