Hostname: page-component-848d4c4894-tn8tq Total loading time: 0 Render date: 2024-07-05T22:53:25.748Z Has data issue: false hasContentIssue false

In situ phase equilibria determination of a manganese ferrite by electrical means

Published online by Cambridge University Press:  31 January 2011

Han-Ill Yoo
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul 151, Korea
Harry L. Tuller
Affiliation:
Crystal Physics and Optical Electronics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology. Cambridge, Massachusetts 02139
Get access

Abstract

Electrical conductivity and thermoelectric power have been measured for a series of MnZn ferrites as functions of the oxygen partial pressure under high-temperature equilibrium conditions. The isothermal variation of both properties was successfully correlated to the onset of phase transitions at characteristic Po2's. The ferrite 0.482MnO-0.518Fe2O3 was examined in some detail to locate the stability fields of the metallic alloy of iron and manganese, manganowustite, the spinel ferrite, and the hematitelike phase, and to extract the appropriate free-energy data. The results confirmed by x-ray diffraction are in satisfactory agreement with literature data.

Type
Articles
Copyright
Copyright © Materials Research Society 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Gallagher, P. K., Gyorgy, E. M., and Johnson, D. W. Jr, Am. Ceram. Soc. Bull. 57, 812 (1978).Google Scholar
2Hill, D. C. and Tuller, H. L., in Ceramic Materials for Electronics, edited by Buchanan, R. (Marcel Dekker, New York, 1986), pp. 265374.Google Scholar
3O'Bryan, H. M. and Gallagher, P. K., Adv. Ceram. Mater. 2, 640 (1987).CrossRefGoogle Scholar
4Tuller, H. L., Yoo, H. I., Kehr, W., and Scheidecker, R. W., Adv. Ceram. 15, 315 (1985).Google Scholar
5Blank, J. M., J. Appl. Phys. Suppl. 32, 378S (1961).CrossRefGoogle Scholar
6Reigen, P., Philips Res. Repts. 23, 151 (1968).Google Scholar
7Slick, P. I., in Ferrites, edited by Hoshine, Y., Lida, B., and Sugimoto, M. (University of Tokyo, Tokyo, Japan, 1971), pp. 8183.Google Scholar
8Morineau, R. and Paulus, M., Phys. Status Solidi A 20, 373 (1973).CrossRefGoogle Scholar
9Bracconi, P. and Gallagher, P. K., J. Am. Ceram. Soc. 62, 172 (1979).CrossRefGoogle Scholar
10Vogler, G., Z. Anorg. Allg. Chern. 387, 72 (1972).CrossRefGoogle Scholar
11Tsuji, T., Asakura, Y., Yamashita, T., and Naito, K., Solid State Chem. 50, 273 (1983).CrossRefGoogle Scholar
12Schwerdtfeger, K. and Muan, A., Trans. AIME 239, 1114 (1967).Google Scholar
13Pelton, A. D., Schmalzried, H., and Sticher, J., Ber. Bunsenges. Phys. Chem. 83, 241 (1979).CrossRefGoogle Scholar
14Yoo, H. I. and Tuller, H. L., J. Am. Ceram. Soc. 70, 388 (1987).CrossRefGoogle Scholar
15Rigaku DMAX-III B, Japan.Google Scholar
16Tannhauser, D. S., J. Phys. Chem. Solids 23, 25 (1962).Google Scholar