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  • 1
    Electronic Resource
    Electronic Resource
    Mischkristallbildung in den Systemen Co1−x Ni x Cr2S4, Cu1−x Ni x Cr2S4 und Co1−x Cu x Cr2S4 Chromchalkogenide, 5. Mitt. (1973)
    Springer
    Monatshefte für Chemie 104 (1973), S. 572-578 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Durch Zusammensintern der Elemente bzw, der binären Sulfide wurde die gegenseitige Mischbarkeit in den Systemen CoCr2S4−NiCr2S4, CuCr2S4−NiCr2S4 und CoCr2S4−CuCr2S4 untersucht. In den Thiospinellen CoCr2S4 und CuCr2S4 können bis zu 20 (26) At% des Kobalts (Kupfers) durch Nickel substituiert werden (950°C), in das monokline NiCr2S4 wird nur wenig Kobalt bzw. Kupfer eingebaut. Zwischen dem halbleitenden, ferrimagnetischen Kobaltchromthiospinell und der metallisch leitenden, ferromagnetischen Kupferverbindung wurde lückenlose Mischkristallbildung beobachtet. Der von derVegardschen Regel abweichende Verlauf der Gitterkonstanten wird im Vergleich mit dem elektrischen und magnetischen Verhalten der Mischkristallreihe diskutiert.
    Notes: Abstract The miscibility within the systems CoCr2S4−NiCr2S4, CuCr2S4−NiCr2S4 and CoCr2S4−CuCr2S4 was studied by annealing the elements or binary sulphides. In the thiospinels CoCr2S4 and CuCr2S4, 20 per cent of cobalt and 26 per cent of copper, resp., can be substituted by nickel at 950°C. In monoclinic NiCr2S4, only small amounts of cobalt or copper are dissolved. The formation of a complete solid solution series was observed between the semiconducting ferrimagnetic CoCr2S4 and the metallic conducting ferromagnetic CuCr2S4. The deviation fromVegard's rule of lattice constants is discussed with respect to the electrical and magnetic behaviour of the solid solution series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903124
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  • 2
    Electronic Resource
    Electronic Resource
    Aluminiumchlorid als Transportmittel zum chemischen Transport von Übergangsmetallchalkogeniden (1974)
    Springer
    Monatshefte für Chemie 105 (1974), S. 849-852 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The closed-tube vapour transport of chalcogenides using anhydrous aluminium chloride as transporting agent has been studied. The conditions for the transport of binary and ternary chromium, manganese, iron, cobalt and nickel sulfides and selenides are communicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00912984
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared reflection spectra, directional dispersion of the phonon modes and dynamical effective charges of FeS2-Marcasite (1985)
    Springer
    Physics and chemistry of minerals 12 (1985), S. 155-160 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The polarized far-infrared reflection spectra of single crystals of FeS2-marcasite are presented in the range from 40–700 cm−1. The spectra show 7 reststrahlen bands, as predicted by group theory. The oscillator parameters ɛα ∞, ωα f, ϱα f, γα f, and the transversal and longitudinal optical phonon frequencies ωTO and ωLO as well as effective ionic charges and oscillator strength weighted mean phonon frequencies were calculated. The anisotropic behaviour of these quantities is discussed in relation to the data for FeS2-pyrite. It is shown that the ionicity of marcasite is considerably smaller than that of pyrite, especially in the a and c direction. The directional dependence of the phonon frequencies is given and discussed with regard to the spectra of polycrystalline samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308209
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  • 4
    Electronic Resource
    Electronic Resource
    Semiempirical band structure calculations on skutterudite-type compounds (1999)
    Springer
    Physics and chemistry of minerals 27 (1999), S. 41-46 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Semiempirical band structure calculations were performed on several skutterudite-type compounds by using the extended Hückel method. Starting with the molecular orbital calculations on isolated P4 and As4 rings, the reason for the band dispersions of the skutterudites was found to be the interactions between the nonmetal atoms. Both the intermolecular and the intramolecular interactions between the phosphorus atoms are stronger than those between the arsenic atoms. Hence, the dispersion of the bands in CoP3 is larger than that in CoAs3. The COOP (crystal orbital overlap population) integrals of the intramolecular P-P bonds reveal the relation between the valence electron count and the observed bond lengths. The P-P bonds in the skutterudite-type compounds like TP3 (T = Co, Rh, Ir) become stronger by reduction as in NiP3 and weaker by oxidation as in RT4X12 (X = P, As, Sb; R = alkaline earth or rare earth metals) because the bands near the Fermi level are bonding. The electronic reason for the geometric distortion of the Ge2Y2 (Y = S, Se) units of mixed skutterudites TGe1.5Y1.5 is caused by an electron pair gap on germanium, which corresponds to low electron density perpendicular to the ring plane on the germanium atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050238
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  • 5
    Electronic Resource
    Electronic Resource
    Lattice dynamics of pyrite FeS2 — polarizable-ion model (1996)
    Springer
    Physics and chemistry of minerals 23 (1996), S. 497-502 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Lattice dynamical calculations of the pyrite FeS2 were performed using the polarizable-ion model (PIM) with different sets of short-range force constants. Not until the mean deviations between the observed and the calculated phonon energies become smaller than 3 cm-1, the true force field can be established. In the case of only slightly greater deviations, the force fields computed differ strongly being without any physical meaning. The results are discussed with respect to the force constants K i , F i , and H i , the effective dynamic charges and polarizabilities of the atoms involved, and the eigenvectors and potential energy distributions of the phonon modes. The most important short-range force constants are K 1 (Fe-S stretching): 0.5 N cm-1, K 2 (internal stretching of the S2 units): 1.0 N cm-1, F 1 (Fe....Fe stretching): 0.2 N cm-1, which indicate repulsive interactions of Fe atoms due to the occupied t 2g orbitals despite the relatively large Fe⋯Fe distances of 383 pm, and F 2 and F 3 (both intermolecular S2⋯S2 interactions): 0.2 N cm-1. The great TO/LO splittings of some of the IR allowed phonon modes (species F u) are caused by the large polarizabilities (2.4.106 and 3.3.106 pm3) of the atoms involved rather than by their effective charges (Fe: 0.2 e).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241999
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  • 6
    Electronic Resource
    Electronic Resource
    Ternäre Bromide mit Spinell-Struktur (1981)
    Springer
    Naturwissenschaften 68 (1981), S. 328-328 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01047476
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  • 7
    Electronic Resource
    Electronic Resource
    Li2CrCl4 ein neuer Chloridspinell mit schneller Lithiumionenleitung (1986)
    Springer
    Naturwissenschaften 73 (1986), S. 623-623 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368778
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  • 8
    Electronic Resource
    Electronic Resource
    Single crystal raman studies of pyrite-type RuS2, RuSe2, OsS2, OsSe2, PtP2, and PtAs2 (1991)
    Springer
    Physics and chemistry of minerals 17 (1991), S. 716-719 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Single crystal Raman spectra of pyrite-type RuS2, RuSe2, OsS2, OsSe2, PtP2, and PtAs2 are presented and discussed with reference to the energies of the X-X stretching modes ν x-x (A g, F g) and the X2 librations $$R_{x_2 } $$ (E, 2Fg). The main results obtained are (i) strong Raman resonance effects, (ii) different sequences for ν x-x (A g) and $$R_{x_2 } $$ (E g), i.e., $$\nu _{x - x} 〉 R_{x_2 } $$ for PtP2 and PtAs2 and $$\nu _{x - x} 〉 R_{x_2 } $$ for OsS2, owing to the interplay of intraionic and interionic lattice forces, (iii) greater strengths for the intraionic P-P and As-As bonds compared to the S-S and Se-Se bonds, respectively, and (iv) a strong influegnce of the metal ions on the strength of the X-X bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202242
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  • 9
    Electronic Resource
    Electronic Resource
    Lattice vibration spectra. LXVIII. Single-crystal Raman spectra of marcasite-type iron chalcogenides and pnictides, FeX2 (X=S, Se, Te; P, As, Sb) (1991)
    Springer
    Physics and chemistry of minerals 18 (1991), S. 265-268 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Single-crystal Raman spectra of marcasite-type FeS2, FeSe2, and FeTe2 and loellingite-type FeP2, FeAs2, and FeSb2 are presented and discussed with reference to the energies of the two X-X stretching modes v x-x (A g, B 1g) and the four X2 librations Rx2 (A g, B 1g, B 2g, B 3g). The main results obtained are that (i) the intraionic X-X bonds of FeS2 marcasite and FeS2 pyrite are nearly equal in strengths (mean values of the S-S stretching modes 418 and 420 cm-1, respectively) and (ii) the interactions of the metal ions and the dumbbell-like X2 units increase on going from the chalcogenides to the respective pnictides and from FeS2 marcasite to pyrite (as shown from the frequencies of the X2 librations).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202579
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4 (1993)
    Springer
    Physics and chemistry of minerals 20 (1993), S. 27-32 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Infrared and Raman spectra of the basic copper salts malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4, as well as of deuterated and 13C substituted samples are presented and discussed in terms of group theory and the hydrogen bonds present. The main results are that (i) the hydrogen donor strengths of the OH− ions are strongly increased due to the very great synergetic effect of the copper ions, (ii) the acceptor strengths of the H-bond acceptor groups (SO4 2-, CO3 2-, and OH− ions) are significantly modified by the linkage and coordination of the acceptor atoms — this complicates true assignment of the OH bands observed to the two and six different OH− ions present in malachite and brochantite, respectively -, and (iii) the Cu — O stretching modes at 430–590 cm−1 and 420–520 cm−1 for malachite and brochantite, respectively, exhibit strong, partially covalent Cu — O bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202247
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