12022-42-3Relevant articles and documents
Mauger, A.,Escorne, M.,Taft, C. A.,Furtado, N. C.,Arguello, Z. P,Arsenio, T. P.
, (1984)
Low-Temperature Reactions using Potassium Iron Disulfide as a Precursor
Allali,Favard,Rambaud,Goloub,Danot
, p. 135 - 142 (1994)
The chain structure of KFeS2 allows exchange reactions to be performed. If potassium is replaced by calcium, the [FeS2] structural framework is retained so that this reaction can be considered as a Soft Chemistry process. It is not the case of the silver exchange which induces a change to a chalcopyrite structure. Potassium can be extracted from KFeS2 but the obtained FeS2 is pyrite. This drastic structural change precludes this reaction to be considered as a Soft Chemistry process.
ANTIFERROMAGNETIC STRUCTURES OF KFeS//2, RbFeS//2, KFeSe//2, AND RbFeSe//2 AND THE CORRELATION BETWEEN MAGNETIC MOMENTS AND CRYSTAL FIELD CALCULATIONS.
Bronger, W.,Kyas, A.,Mueller, P.
, p. 262 - 270 (1987)
The ternary compounds KFeS//2, RbFeS//2, KFeSe//2, and RbFeSe//2 were prepared and their crystal structures were determined from single-crystal diffractometer data. The atomic arrangement in the isotypic compounds (space group C2/c) is characterized by tetrahedra of chalcogen atoms. Those tetrahedra are centered by iron ions and linked by edges, thus forming chains of **1// infinity left bracket FeX** minus //4/////2 right bracket frameworks. Susceptibility measurements are reported. Calculations based on a simple point charge model are discussed to correlate the magnetic moments and crystal field splittings.
Crystal structures of CsFe2S3 and RbFe 2S3: Synthetic analogs of rasvumite KFe2S 3
Mitchell, Roger H.,Ross, Kirk C.,Potter, Eric G.
, p. 1867 - 1872 (2004)
The isostructural alkali thioferrate compounds CsFe2S 3, RbFe2S3 and KFe2S3 have been synthesized by reacting Fe and S with their corresponding AFeS 2 (A=K, Rb, Cs) precursors. The crystal structures of these and binary compounds of intermediate composition were determined by Rietveld analysis of laboratory powder X-ray diffraction patterns. All of the synthesized compounds adopt the space group Cmcm (#63), Z=4 with: a=9.5193(8)A, b=11.5826(10)A, c=5.4820(4)A for CsFe2S3; a=9.2202(7)A, b=11.2429(9)A, c=5.4450(3)A for RbFe 2S3; and a=9.0415(13)A, b=11.0298(17)A, c=5.4177(6)A for KFe2S3. These mixed valence alkali thioferrates show regular changes in cell dimensions, AS10 (A=K, Rb, Cs) polyhedron volumes, polyhedron distortion parameters, and calculated oxidation state of Fe with respect to increasing size of the alkali element cation. The calculated empirical oxidation state of iron varies from +2.618 (CsFe2S3), through +2.666 (RbFe2S3) to +2.77 (KFe2S3).
OBSERVATION OF THE ANTIFERROMAGNETIC TRANSITION IN THE LINEAR CHAIN COMPOUND KFeS2 BY MAGNETIC SUSCEPTIBILITY AND HEAT CAPACITY MEASUREMENTS.
Johnston,Mraw,Jacobson
, p. 255 - 258 (1982)
Magnetic susceptibility ( CHI ) and heat capacity measurements on KFeS//2 are reported. The data were obtained on a specially purified sample over the temperature ranges 10-360 K and 225-296 K, respectively.
Regular versus alternating (FeS4)(n) chains: Magnetism in KFeS2 and CsFeS2
Tiwary, Satish K.,Vasudevan, Sukumaran
, (2008/10/08)
We report crystal magnetic susceptibility results of two S=1/2 one-dimensional Heisenberg antiferromagnets, KFeS2 and CsFeS2. Both compounds consist of (FeS4)(n) chains with an average Fe-Fe distance of 2.7 ?. InKFeS2, all intrachain Fe-Fe distances are identical. Its magnetic susce ptibility is typical of a regular antiferromagnetic chain with spin-spinexchange parameter J=-440.7 K. In CsFeS2, however, the Fe-Fe distances alternate between 2.61 and 2.82 ?. This is reflected in its magnetic susceptibility, which could be fitted with J=-640 K, and the degree of alternation, α=0.3. These compounds form a unique pair, and allow for a convenient experimental comparison of the magnetic properties of r egular versus alternating Heisenberg chains.
