Abstract
As a model of an internal displacement reaction involving a ternary oxide “line” compound, the following reaction was studied at 1273 K as a function of time, t:
Both polycrystalline and single-crystal materials were used as the starting NiTiO3 oxide. During the reaction, the Ni in the oxide compound is displaced by Fe and it precipitates as a γ-(Ni-Fe) alloy. The reaction preserves the starting ilmenite structure. The product oxide has a constant Ti concentration across the reaction zone, with variation in the concentration of Fe and Ni, consistent with ilmenite composition. In the case of single-crystal NiTiO3 as the starting oxide, the γ alloy has a “layered” structure and the layer separation is suggestive of Liesegang-type precipitation. In the case of polycrystalline NiTiO3 as the starting oxide, the alloy precipitates mainly along grain boundaries, with some particles inside the grains. A concentration gradient exists in the alloy across the reaction zone and the composition is >95 at. pct Ni at the reaction front. The parabolic rate constant for the reaction is k p =1.3 × 10−12 m2 s−1 and is nearly the same for both single-crystal and polycrystalline oxides.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
R.A. Rapp, A. Ezis, and G.J. Yurek: Metall. Trans., 1973, vol. 4, p. 1283.
G.J. Yurek, R.A. Rapp, and J.P. Hirth: Metall. Trans., 1973, vol. 4, p. 1293.
S.N.S. Reddy and L.B. Wiggins: Metall. Mater. Trans. A, 2002, vol. 33A, p. 2899.
C. Tangchitvittaya, J.P. Hirth, and R.A. Rapp: Metall. Trans. A, 1982, vol. 13A, p. 585.
D.W. Song, R. Subramanian, and R. Dieckmann: Mater. Res. Symp. Proc., 1995, vol. 365, p. 59.
J.P. Smith, P. Limthongkul, and S.L. Sass: Acta Mater., 1997, vol. 45, p. 4241.
R.A. Rapp: Corrosion, 1965, vol. 8, p. 889.
H. Schmalzried: Ber. Bunsenges. Phys. Chem., 1983, vol. 87, p. 51.
H. Schmalzried: Ber. Bunsenges. Phys. Chem., 1984, vol. 88, p. 1186.
H. Schmalzried and M. Backhaus-Ricoult: Progr. Solid State Chem., 1993, vol. 22, p. 1.
R.L. Shook, R.A. Rapp, and J.P. Hirth: Metall. Trans. A, 1985, vol. 16A, p. 1815.
S.N.S. Reddy, D.N. Leonard, L.B. Wiggins, and K.T. Jacob: Metall. Mater. Trans. A, 2005, vol. 36A, pp. 2695–2703.
W. Simons and E. Woermann: Contrib. Mineral. Petrol., 1978, vol. 66, p. 81.
R.W. Taylor and H. Schmalzried: J. Phys. Chem., 1964, vol. 68, p. 2444.
G.M. Kale and K.T. Jacob: Metall. Trans. B, 1991, vol. 23B, p. 57.
V.A. Van Rooijen, E.W. Van Royen, J. Vrigen, and S. Radelaar: Acta Metall., 1975, vol. 23, p. 987.
D. Ricoult and H. Schmalzried: Ber. Bunsenges. Phys. Chem., 1986, vol. 90, p. 135.
H. Schmalzried and W. Laqua: Oxid. Met., 1981, vol. 15, p. 339.
W. Laqua, and H. Schmalzried: in High Temperature Corrosion, R.A. Rapp, ed., NACE, Houston, TX, 1983, p. 115.
G. Eriksson and A.D. Pelton: Metall. Trans. B, 1993, vol. 24B, p. 795.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Reddy, S.N.S., Wiggins, L.B., Leonard, D.N. et al. Internal displacement reactions in multicomponent oxides. Part I. Line compounds with narrow homogeneity range. Metall Mater Trans A 36, 2685–2694 (2005). https://doi.org/10.1007/s11661-005-0265-2
Received:
Issue Date:
DOI: https://doi.org/10.1007/s11661-005-0265-2