Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-28T15:06:54.921Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermochemical stability of BaFe12O19 and BaFe2O4 and phase relations in the Ba-Fe-O ternary system

Published online by Cambridge University Press:  03 March 2011

Jinshan Li ,
Turgut M. Gür ,
Robert Sinclair ,
Stephen S. Rosenblum  and
Hidetaka Hayashi
Jinshan Li
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
Turgut M. Gür
Affiliation:
Center for Materials Research, Stanford University, Stanford, California 94305
Robert Sinclair
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
Stephen S. Rosenblum
Affiliation:
Applied Electronics Center, Kobe Steel USA, Palo Alto, California 94304
Hidetaka Hayashi
Affiliation:
Applied Electronics Center, Kobe Steel USA, Palo Alto, California 94304
Get access

Abstract

The stability of BaFe12O19 and BaFe2O4 was studied by the oxygen coulometric titration technique between 700 °C and 1000 °C using a solid-state electrochemical cell. This temperature range is technologically important for the deposition of BaFe2O19 magnetic thin films. The thermodynamic information obtained from the titration measurements was corroborated with structural identification of phases prepared under electrochemically controlled conditions. Accordingly, a section of the Ba–Fe–O ternary phase diagram around the BaFe12O19 composition was constructed in this temperature range. The standard Gibbs free energy change for the decomposition of BaFe12O19 into BaFe2O4, Fe3O4, and O2 is given by the expression ΔG°[J/mol] = 7.23 × 105 −480T. In the oxygen pressure-temperature domain, the thermodynamic stability limits of BaFe12O19 and BaFe2O4 are given by the expressions In[Po2(atm)] = 69.37 −1.04 × 105 T−1 and In[Po2(atm)] = 27.68 −7.12 × 104 T−1, respectively. The stability limits determined here help define the process conditions for the successful synthesis of these phases.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1499 - 1512
Copyright
Copyright © Materials Research Society 1994

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

1Simmons, R. G., IEEE Trans. Magn. 25, 4051 (1989).CrossRefGoogle Scholar
2Smit, J. and Wijn, H. P. J., Ferrites (John Wiley, New York, 1959).Google Scholar
3Adelsköld, V., Arkiv. Kemi. Mineral. Geol. 12A, 1 (1938).Google Scholar
4Goto, Y. and Takada, T., J. Am. Ceram. Soc. 43, 150 (1960).CrossRefGoogle Scholar
5Van Hook, H. J., J. Am. Ceram. Soc. 47, 579 (1964).Google Scholar
6Negas, T. and Roth, R. S., J. Res. Natl. Bur. Stand. Sec. A 73, 426 (1969).Google Scholar
7Montorsi, M. and Appendino, P., Atti. Accad. Sci. Torino, Cl. Sci. Fis. Mat. Nat. 113, 479 (1979).Google Scholar
8Shirk, B. T., Mater. Res. Bull. V, 771 (1970).Google Scholar
9Sloccari, G., J. Am. Ceram. Soc. 56, 489 (1973).Google Scholar
10Boivin, J-C., Thomas, D., Pouillard, G., and Perrot, P., J. Solid State Chem. 29, 101 (1979).Google Scholar
11Pouillard, G., Shamsul Alam, M., Trinel-Dufour, M-C., and Perrot, P., J. Chem. Res. (M), 1720 (1981), and J. Chem. Res., Synop. (5), 136 (1981).Google Scholar
12Deo, B., Kachhawaka, J. S., and Tare, V. B., Metall. Trans. B 7B, 405 (1976).CrossRefGoogle Scholar
13Morisako, A., Matsumoto, M., and Naoe, M., IEEE Trans. Magn. 6, 3024 (1988).CrossRefGoogle Scholar
14Naoe, M., Hasunuma, S., Hoshi, Y., and Yamanaka, S., IEEE Trans. Magn. MAG–17, 3184 (1981).CrossRefGoogle Scholar
15Matsuoka, M. and Naoe, M., J. Appl. Phys. 57, 4040 (1985).Google Scholar
16Morisako, A., Matsumoto, M., and Naoe, M., IEEE Trans. MAG–23, 56 (1987).Google Scholar
17Nakata, J., Iwata, S., and Uchiyama, S., IEEE Trans. J. Magn. Jpn. 3, 816 (1988).Google Scholar
18Dotsch, H., Mateika, D., Roschmann, P., and Tolksdorf, W., Mater. Res. Bull. XVIII, 1209 (1983).CrossRefGoogle Scholar
19Rinaldi, S. and Licci, F., IEEE Trans. Magn. MAG–20, 1267 (1984).Google Scholar
20Zaquine, I., Benazizi, H., and Mage, J. C., J. Appl. Phys. 64, 5822 (1988).CrossRefGoogle Scholar
21Glass, H. L., Proc. IEEE 76, 151 (1988).CrossRefGoogle Scholar
22Webb, D. C., IEEE Trans. Magn. 24, 2799 (1988).Google Scholar
23Adam, J. D., Krishnaswamy, S. V., Talisa, S. H., and Yoo, K. C., J. Magn. Mater. 83, 419 (1990).Google Scholar
24Wagner, C., J. Chem. Phys. 21, 1819 (1953).Google Scholar
25Piekarczyk, W., Weppner, W., and Rabenau, A., Z. Naturforsch. 34A, 430 (1979).Google Scholar
26Weppner, W., Li-chuan, C., and Piekarczyk, W., Z. Naturforsch. 35A, 381 (1980).CrossRefGoogle Scholar
27Ahn, B. T., Gür, T. M., Huggins, R. A., Beyers, R., Engler, E. M., Grant, P. M., Parkin, S. S. P., Lim, G., Ramirez, M. L., Roche, K. P., Vazquez, J. E., Lee, V. Y., and Jacowitz, R. D., Physica C 153–155, 590 (1988).Google Scholar
28Ahn, B. T., Lee, V. Y., Beyers, R., Gür, T. M., and Huggins, R. A., Physica C 167, 529 (1990).Google Scholar
29Weppner, W., Solid State Ionics 3/4, 1 (1981).Google Scholar
30Belzner, A., Gür, T. M., and Huggins, R. A., Solid State Ionics 57, 327 (1992).Google Scholar
31Porat, O. and Riess, I., Appl. Phys. Lett. 61, 366 (1992).CrossRefGoogle Scholar
32Gür, T. M., Raistrick, I. D., and Huggins, R. A., Mater. Sci. Eng. 46, 53 (1980).CrossRefGoogle Scholar
33Patterson, J. W., Bogren, E. C., and Rapp, R. A., J. Electrochem. Soc. 114, 752 (1967).Google Scholar
34Barin, I. and Knacke, O., Thermochemical Properties of Inorganic Substances (Springer-Verlag, Berlin, 1973).Google Scholar
35Weppner, W., Li-chuan, C., and Rabenau, A., J. Solid State Chem. 31, 257 (1980).Google Scholar
36JANAF Thermochemical Tables, J. Phys. Chem. Ref. Data 14, Suppl. 1 (1985).Google Scholar
37Landiya, N. A., Pavlenishvili, T. A., and Chachanidze, G. D., Russ. J. Phys. Chem. 43, 555 (1969).Google Scholar
38Benz, R. and Wagner, C., J. Phys. Chem. 65, 1308 (1961).CrossRefGoogle Scholar
39Ramanarayanan, T. A., Narula, M. L., and Worrell, W. L., J. Electrochem. Soc. 126, 1360 (1979).Google Scholar
40Lucchini, E., Meriani, S., and Minichelli, D., Acta Crystallogr. B 29, 1217 (1973).CrossRefGoogle Scholar