Ceramics-Silikáty 48 (4) 175-179 (2004)

Synthesis and Physical Properties of Ruddlesden-Popper Phase Sr₃Mn_2-xFe_xO_7-d (x = 0.15 ~ 1.0)

Min-Seok Song, Suk-Young Kim, Jai-Yeoul Lee

Double layer R-P manganate phases Sr₃Mn₂O_7-d 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.

Keywords: R-P phase, Layered manganate, Magnetic properties, Spin glass