Ceramics-Silikáty 48, (4) 175 - 179 (2004) |
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Synthesis and Physical Properties of Ruddlesden-Popper Phase Sr₃Mn2-xFexO7-d (x = 0.15 ∼ 1.0)
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Song Min-Seok, Kim Suk-Young, Lee Jai-Yeoul
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School of Metallurgical and Materials Engineering, Center for Materials Research
Yeungnam University, 214-1 Daedong Gyongsan Gyoungbuk, 712-749, Korea
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Keywords: R-P phase, Layered manganate, Magnetic properties, Spin glass
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Double layer R–P manganate phases Sr₃Mn₂O7-δ were stabilized by partial substitution of Mn with Fe in air atmosphere. The
minimum amount of Fe needed to stabilize single phase of R-P in air atmosphere was about x = 0.15. As the Fe content x
increased, the optimum reaction temperatures were lowered from 1530°C for x = 0.15 sample to 1400°C for x = 1.0 sample.
The structural parameters were refined on the basis of space group I4/mmm by Rietveld method with powder X-ray diffraction
data. Magnetic susceptibility data indicate that these samples have very complicate magnetic properties. It also shows
spin-glass like transitions at low temperatures when x was larger than 0.5. |
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