EFFECT OF Fe$sup 4+$ IN THE SYSTEM SrFeO$sub 3$-SrTiO$sub 3$
Perovskites of the system SrFeO/sub 3/--SrTiO/sub 3/ were prepared, and measurements were made of their magnetic and electrical behavior. Chemical analysis showed that the percentage of Fe/sup 4+/ varied from 72.5% for SrFeO/sub 2.86/ to about zero for Sr(Fe/sub 0.1/Ti/sub 0.9/)O/sub 2.95/; the remainder of the iron was in the Fe/sup 3+/ state and electrical balance was achieved by oxygen loss. Sr(Fe/sub 1-x/ Ti/sub x/)O/sub 3/ was antiferromagnetic between x = 0 and x =0.9, with a Neel temperature below 60 l K. A parasitic ferromagnetic component developed when the compounds were cooled in a magnetic field, the magnitude of the component being dependent on the cooling field. The conductivity of the perovskites ranged from 10/sup -8/ ohm/sup -1/ cm/sup -1/ for x= 1.0 to 10/sup -2/ for x = 0.0 and showed a marked change at x = 0.8. The break corresponded to a change in slope of the lattice parameter and the disappearance of Fe/sup 4+/. The Fe/sup 4+/ content depended on the heat treatment and atmosphere during formation. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-023983
- OSTI ID:
- 4721046
- Journal Information:
- Journal of the American Ceramic Society (U.S.), Vol. Vol: 46; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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