Mossbauer Spectroscopy of Langbeinite-Type K_2Fe_2(SO_4)_3

概要

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The langbeinite-type K2F82(804)3 was synthesized. The ternperature dependence of the dielec-tric constant shows a clear anomaly at about 130 K. M6ssbauer spectrum of "Fe was recordedin the temperature range frotn 15 to 290 K. The spectrtrna at all temperatures consists of twodoublets which are analyzed with isomer sltifts and quadrupole couplings. The quadrupole split-ting of one site is 3.00 mm/s at 290 K and shows only 10% increase down to 15 K. The other oneis 0.82 turn's at 290 K and shows a drastic increase, resulting at 15 K in 2.5 times that at 290 K.The two Fe sites for the electric field gradient were assigned to the two crystallographicallyinequivalent iron sites compairing the two octahedral oxygen environments of the iron ions. Thebroad backgrotund spectrum is interpreted as tlae distribtrtion of the electric field gradient dueto the multi-positional distribtrtion in S04 groups proposed by Itoh et at.
社団法人日本物理学会の論文
1996-05-15