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Title
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Synthesis, crystal structure and physico-chemical properties of the new quaternary oxide
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Author
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Abstract
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| A new black quaternary oxide Sr5BiNi2O9.6 was synthesized by solid state reaction at 1200 °C. Its structure was solved by electron crystallography and X-ray powder refinement, yielding a tetragonal structure with space group I4/mmm, a=5.3637 (2) Å, c=17.5541(5) Å, Z=4. The structure can be described as a stacking of (Bi,Sr)O rocksalt slabs and SrNiO3−δ perovskite slabs. The initial nickel valence is close to +3.1. Thermogravimetry and high-temperature oxygen coulometry showed that this compound has variable oxygen content as a function of temperature and oxygen pressure, and ultimately decomposes when heated in low oxygen pressure above 800 °C. It is a metallic conductor with n-type conduction. Its thermoelectric power was determined and found to be −20 and −38 μV/K at 300 and 650 °C, respectively. Magnetic measurements confirm the nickel valence close to +3 and show evidence of magnetic ordering at 20 K. |
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Language
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English
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Source (journal)
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Journal of solid state chemistry. - London
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Publication
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London
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2011
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ISSN
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0022-4596
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DOI
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10.1016/J.JSSC.2011.10.020
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Volume/pages
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184
:12
(2011)
, p. 3262-3268
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ISI
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000297662500021
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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