Synthesis, characterization, and superconducting and magnetic properties of electrochemically oxidized La2CuO4+δ and La2−xSrxCuO4+δ (0.01 ≤ x ≤ 0.33, 0.01 ≤ δ ≤ 0.36)
✍ Scribed by F.C. Chou; J.H. Cho; D.C. Johnston
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 869 KB
- Volume
- 197
- Category
- Article
- ISSN
- 0921-4534
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pretations disagree on its nature (6-8). The thermal depen-Materials with La 2 NiO 4؉␦ composition, ␦ ranging between 0 dence of the conductivity of La 2 NiO 4ϩͳ (0 Յ ͳ Յ 0.05) has and 0.25, have been prepared either by solid state reaction or been described by Arrhenius laws with activation energie
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## Abstract The title compounds are prepared by solid state reaction of La~2~O~3~, CaCO~3~, and NiO (1000, 1100, and 1200 °C for 12 h each, followed by sintering at 1300 °C for 24 h).
The effects of nonstoichiometry on the crystal structure, thermal expansion, structural phase transitions, and magnetic properties of La 4 Co 3 O 10؉ , 0.004 40.30, have been investigated between 2 and 1000 K. Rietveld analysis of high resolution powder X-ray diffraction data reveals the crystal str