Abstract
The reactive sintering of zinc ferrite, i.e. firing without previously calcining, has been studied using three types of iron oxide. The conversion into ferrite as well as the simultaneous densification were investigated upon variations in morphology and impurity content. The formation reaction is shown to be accompanied by a strong increase of the median pore size. This phenomenon appears responsible for the generally smaller density of the final material as compared with single-phase sintering. It is shown that reactive sintering is inevitably accompanied by expansion, irrespective of molecular volume variations. A calcining step appears indispensable for the preparation of the highest quality of ferrites.
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References
D. Kolar,Sci. Ceram. 11 (1981) 199.
Shen Yangyun andR. J. Brook,Sci. Sintering 17 (1985) 35.
M. Trontelj andD. Kolar,Special Ceram. 6 (1975) 39.
C. Leblud, M. R. Anseau, E. di Rupo, F. Cambier andP. Fierens,J. Mater. Sci 16 (1981) 539.
F. J. C. M. Toolenaar,Solid State Ionics 16 (1985) 267.
L. J. Bowen, R. J. Weston, T. G. Carruthers andR. J. Brook,J. Mater. Sci. 13 (1978) 341.
F. Kools,Solid State Ionics 16 (1985) 251.
G. Rossi andJ. E. Burke,J. Amer. Ceram. Soc. 56 (1973) 654.
F. M. A. Carpay andA. L. Stuijts,Sci. Ceram. 8 (1976) 23.
R. L. Coble,Mater. Sci. Monogr. 14 (1982) 145.
D. W. Readey, in “Microstructure and Properties of Ceramic Materials”, edited by T. S. Yan and J. A. Pask (North-Holland, Amsterdam, 1984) p. 134.
M. A. Strivens andG. Chol, in Proceedings of the 2nd International Conference on Ferrites, Kyoto, 1970, edited by Y. Hoshino, S. Iida and M. Sugimoto (University of Tokyo Press, 1971) p. 239.
D. W. Hopkins,J. Electrochem. Soc. 96 (1949) 195.
R. Lindner,J. Chem. Phys. 23 (1953) 410.
J. F. Duncan andD. J. Stewart,Trans. Faraday Soc. 63 (1967) 1031.
J. Beretka andM. J. Ridge,Nature 216 (1967) 473.
D. Elwell, R. Parker andC. J. Tinsley,Czech. J. Phys. B 17 (1967) 382.
K. Krishnamurthy, J. Gopalakrishnan, G. Aravamudan andM. Sastri,J. Inorg. Nucl. Chem. 36 (1974) 569.
E. K. Belyaev,Izv. Akad. Nauk. SSSR, Neorg. Mat. (En) 13 (1977) 2031.
G. A. Kolta, S. Z. El-Tawil, A. A. Ibrahim andN. S. Felix,Thermochim. Acta 36 (1980) 359.
T. Yamaguchi andT. Nomura, in Proceedings of the 3rd International Conference on Ferrites, Kyoto, 1980, edited by H. Watanabe, S. Iida and M. Sugimoto (Centre for Academic Publication, Japan, 1981) p. 46.
M. Ito, M. Senna andH. Kuno,ibid. p. 50.
V. Balek,Sprechsaal 117 (1984) 1112.
A. Feltz andA. Martin,Mater. Sci. Monogr. 28A (1985) 137.
R. Furuichi, K. Tani, K. Kameda andT. Ishii,Reactivity of Solids 1 (1986) 309.
Y. Hayashi, T. Kimura andT. Yamaguchi,J. Amer. Ceram. Soc. 69 (1986) 322.
P. J. L. Reijnen,Sci. Ceram. 4 (1968) 169.
V. F. Komarov andYu. D. Tret'yakov,Izv. Akad. Nauk. SSR Neorg. Mater. 8 (1972) 120 (En.).
U. Wagner,J. Magn. Magn. Mater. 23 (1981) 73.
F. X. N. M. Kools, private communications (1987).
G. C. Kuczynski, in “Sintering and Related Phenomena”, edited by G. C. Kuczynski, N. A. Hooton and C. F. Gibbon (Gordon and Breach, New York, 1967) p. 685.
E. di Rupo, M. R. Anseau andR. J. Brook,J. Mater. Sci. 14 (1979) 2924.
Y. Nakamura, S. Chandratreya andR. Fulrath,Ceramurgia Int. 6 (1980) 57.
M. R. Anseau, E. di Rupo andF. Cambier,ibid. 16 (1981) 825.
A. Lesniewski, S. Gasiorek andR. Moskalewicz,Sci. Sintering 11 (1981) 99.
Handbook of Chemistry and Physics, 64th Edn, (1983) pp. B101, B156.
M. Paulus, in “Preparative Methods in Solids State Chemistry”, edited by P. Hagenmuller (Academic, New York, 1972) p. 487.
O. J. Whittemore Jr andJ. J. Sipe,Powder Technol. 9 (1974) 159.
A. L. Stuijts,Solid State Ionics 16 (1985) 108.
T. K. Gupta andR. L. Coble,J. Amer. Ceram. Soc. 51 (1968) 521.
M. Paulus,Mater. Sci. Res. 6 (1973) 225.
A. L. Stuijts, in “Ceramic Microstructures '76”, edited by R. M. Fulrath and J. A. Pask (Westview, Boulder, Colorado, USA, 1977) p. 1.
W. D. Kingery andB. Francois, in “Sintering and Related Phenomena”, edited by G. C. Kuczynski, N. A. Hooton and C. F. Gibbon (Gordon and Breach, New York, 1967) p. 471.
F. F. Lange,J. Amer. Ceram. Soc. 67 (1984) 83.
A. G. Evans,ibid. 65 (1982) 497.