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  • 1
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Kaliumthiochromite (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 975-985 
    Details
    ISSN: 1434-4475
    Keywords: 2H-K0.5(H2O)0.2CrS2 ; KCr3S5 ; Layer compounds ; Potassium thiochromites ; Topotactic thermal degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract KCrS2, KCr5S8 and the new compound KCr3S5 were prepared by the reaction of H2S with chromium in K2CO3 melts. KCr3S5 (space group C2/m,a=19.16 Å,b=3.49 Å,c=12.02 Å, β=123.0°) is isotypic with TlCr3S5 having a psilomelane like channel structure. The thermal degradation: $$KCrS_2 \xrightarrow{{ - K_2 S}}KCr_3 S_5 \xrightarrow{{ - K_2 S}}KCr_5 S_8$$ was studied and the topochemical relations between the products are discussed. A new layered phase K0.5(H2O)0.2CrS2 having a 2 H stacking sequence (space group P63/mmc,a=3.36 Å,c=16.83 Å) was prepared from polysulfide melts. The dehydration of this phase was studied by TGA and X-rays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798765
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  • 2
    Electronic Resource
    Electronic Resource
    Thermogravimetrische Untersuchungen an zeolithischen Erdalkalithioferraten(III) (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 475-481 
    Details
    ISSN: 1434-4475
    Keywords: Chalcogenides ; Thermogravimetry ; Zeolitic Hydrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The degradation of the hydrates of the alkaline earth thioferratesM(FeS2)2·xH2O,M=Ca, Sr, Ba, resulting from ion exchange on KFeS2, is studied by TG and by X-ray diffraction analysis. The zeolitic character of the very loosely bound water in these compounds is proved. There exist several cristallographically distinct phases as a function of the water content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903244
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  • 3
    Electronic Resource
    Electronic Resource
    Na3Fe2S4, ein Thioferrat mit gemischt valenter sk∞/1[FeS2]-Kette (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 83-89 
    Details
    ISSN: 1434-4475
    Keywords: Chalcogenides ; Na3Fe2S4 ; Thioferrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Na3Fe2S4 has been prepared from Na2S, S and Fe. It crystallizes in space group Pnma,a=6.6333 (5) Å,b=10.675 (1) Å,c=10.677 (2) Å,Z=4. The crystal structure, as determined from single crystal four-circle diffractometer data (R=2.8%), consists of sk∞/1[FeS2]-chains formed by slightly distorted edge sharing [FeS4]-tetrahedra, the iron atoms having a formal valency of +2.5. The sodium ions are approximately octahedrally coordinated. Exposed to air, Na3Fe2S4 readily takes up water to form a hydrate by a pertially topochemical reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00906245
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