ISSN:
1573-7357
Keywords:
74.62 Bf
;
74.72 Jt
;
81.20.−n
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Binary cuprates of Sr2CuO3+δ and SrCuO2 have been synthesized at low temperatures below 500 °C under various values of partial oxygen-pressure $$P_{O_2 }$$ by thermal decomposition of hydroxide precursors, Sr2Cu(OH)6 and SrCu(OH)4, respectively. The tetragonal Sr2CuO3+δ (δ ∼ 0.3) is obtained by the heat-treatment at 400 ° C and $$P_{O_2 }$$ ≥ 0.2 atm. The value of δ appears to be independent of $$P_{O_2 }$$ and unchangeable. On the other hand, the orthorhombic Sr2CuO3+δ (δ ∼ 0) is obtained by the heat-treatment at 400 °C in flowing gas of N2. For 0 〈 $$P_{O_2 }$$ 〈 0.2 atm, a mixture of the tetragonal and orthorhombic phases is obtained. The orthorhombic SrCuO2 is obtained by the heat-treatment at 500 ° C in flowing gas of N2, although the tetragonal SrCuO2, namely, the so-called infinite-layer compound is not obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00753912
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