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1Author    J. Pebler, K. Schmidt, H. WasinskiRequires cookie*
 Title    Untersuchung des M2/M3-Phasenübergangs in Vi^Fe^Oa mit x = 0,024 Investigation of the M2/M3 Phase Transition in Vj^Fe^Og with x = 0.024  
 Abstract    Phase The Mössbauer investigations of Vi__!.Fea.02 with x = 0.024 indicate that Fe enters two cation positions of M2 and M3. At the phase transition the two quadrupole splittings show a discontinuous behavior whereas the isomer shift changes continuously with a crossing-over at the M2, M3 transition (Tt, = 275 K). Generally a first order phase transition is accompanied by a change of the cell volume V and a change of the isomer shift. The ob-served continuous behavior of the isomer shift points to a first order transition with 8V + 0. 
  Reference    (Z. Naturforsch. 31b, 1367—1371 [1976]; eingegangen am 5. Juli 1976) 
  Published    1976 
  Keywords    Transition, Field Gradient, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1367.pdf 
 Identifier    ZNB-1976-31b-1367 
 Volume    31 
2Author    Dieter WeberRequires cookie*
 Title    CHsNHsSnBraJa-z = 0-3), a Sn(II)-System with Cubic Perovskite Structure  
 Abstract    CH3NH3SnBr^l3 -.x [x = 0—3) has the cubic perovskite structure with the unit cell parameters a = 5.89 A {x = 3), a = 6.01 A (x = 2) and a = 6.24 A (x = 0) and Z = 1. The compounds show intense colour and conducting property. The U9 Sn Mössbauer data are consistent with the high symmetry environment of the Sn(II)-ion. A bonding model, using a "p-resonance-bonding", can explain the properties of the cubic system. The synthesis is described. 
  Reference    Z. Naturforsch. 33b, 862—865 (1978); eingegangen am 5. Mai 1978 
  Published    1978 
  Keywords    Synthesis, X-ray, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0862.pdf 
 Identifier    ZNB-1978-33b-0862 
 Volume    33 
3Author    Hidenari Inoue, Ekkehard FluckRequires cookie*
 Title    Mößbauer-und Röntgenphotoelektronen-spektroskopische Untersuchungen an Berlinerblau-Analoga des Typs Fe[M B (CN)6] Mößbauer and X-Ray Photoelectron Spectroscopic Studies on Prussian Blue Analogs of the Type Fe[M B (CN)6]  
 Abstract    Prussian Blue analogs of the type Fe[M B (CN)e] (M B = Pd and Pt) crystallize in the face-centered cubic system: space group Fm3m-0^, Z = 4. Magnetochemical and Mößbauer spectroscopic measurements have revealed that nitrogen-coordinated iron(II) ions and carbon-coordinated M B (IV) ions are in the high spin state and in the low spin state, respectively, in the temperature range 4.2 to 300 K. Upon the formation of Fe[M B (CN)ß] from K2[M B (CN)6], the binding energies of N Is, Pd 3d5/2 and Pt 4f7/2 increase while the C 1 s binding energy decreases. This tendency could be interpreted in terms of the inductive effect of iron(II) ions attached to the nitrogen end of cyanide ligands. 
  Reference    Z. Naturforsch. 38b, 687—691 (1983); eingegangen am 7. Februar 1983 
  Published    1983 
  Keywords    Mößbauer Spectra, X-Ray Photoelectron Spectra, Prussian Blue Analogs 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0687.pdf 
 Identifier    ZNB-1983-38b-0687 
 Volume    38 
4Author    Hubert Schmidbaur, Beatrix Milewski-Mahrla, FritzE. WagnerRequires cookie*
 Title    Synthese, Struktur und Sb-Mößbauer-Spektren kovalenter und ionischer Tetraorganoantimon(V) -Verbindungen Synthesis, Structure and Sb-Mößbauer Spectra of Covalent and Ionic Tetraorganoantimony(V) Compounds  
 Abstract    Tetramethylstibonium and tetraphenylstibonium oxinate*(l, 2) and anthranilate (4, 5) have been prepared from the antimony pentaorganyls and 8-oxy-quinoline or anthranilic acid, respectively. The crystal structure determination of 1 revealed covalent molecules with planar bidentate oxinate as part of a distorted coordination octahedron at antimony. -121 Sb-Mößbauer spectra of 1, 2, 4, 5 and of tetramethylstibonium acetylacetonate (3) are also in agreement with covalent structures, but a pentacoordinate environment of Sb is more likely for the anthranilates 4, 5. The spectra of the hydrogendicarboxylates 6-9, however, point to ionic stuctures with, if any, only weak donor interactions of the anions with the stibonium cations. 
  Reference    Z. Naturforsch. 38b, 1477—1483 (1983); eingegangen am 14. Juli 1983 
  Published    1983 
  Keywords    Organoantimony Compounds, Mößbauer Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1477.pdf 
 Identifier    ZNB-1983-38b-1477 
 Volume    38 
5Author    E. Bill1, N. Blaes2, K. F. Fischer3, U. G. Onser2, K. H. Pauly3, R. Preston2, F. Seel4, R. Staab4, A.X T Rautw Ein1Requires cookie*
 Title    Crystal Structure and Mössbauer Spectroscopic Investigation of the Low Temperature Molecular Dynamics of Hexa(2-ethylimidazole)iron(II) Hydridotetracarbonylferrate(-II)  
 Abstract    The title compound 1 was synthesized as reaction product of pentacarbonyl iron with 2-ethyl-imidazole. A Zerewitinoff-determination shows that we are rather dealing with hydrido-tetracar-bonylferrate(-II) than with tetracarbonylferrate(-I) as supposed in a preceding paper. A new crystal structure analysis of 1 was performed. With respect to [HFe(CO)4]~ we found that three CO groups are ordered with normal tetrahedral angles, while the fourth CO group shows statisti­ cal distribution over three sites (disordered sites). The temperature parameters of the disordered CO sites are considerably more anisotropic than those of the ordered CO sites. Experimental Mössbauer spectra have been recorded between 4.2 K and 288.7 K. 1 exhibits a Mössbauer pattern with two subspectra, one for each of the cations and the anions. The cation subspectrum reflects normal ferrous high-spin behavior, while the anion subspectrum shows peculiar anomalies around 200 K. On the basis of our X-ray structure results molecular orbital calculations have been performed with the aim of deriving electric field gradient tensors for the various stochastic substates of [HFe(CO)4]~. These tensors were then used within the frame on an analytical lineshape formula. It turns out that the statistical distribution of the fourth CO group over three sites is associated with a jump behavior, similar to trapped diffusion, of the CO group among the three sites and not with static disorder. The Fe atom follows this jumb behavior, however, its triangular displacement body with jump distance d ~ 0.30 Ä is considerably smaller than that of the CO group. 
  Reference    Z. Naturforsch. 39b, 333 (1984); eingegangen am 15. A u gu st/10. Oktober 1983 
  Published    1984 
  Keywords    Hydridotetracarbonylferrate, Crystallography, Mössbauer Spectra, Temperature Factors, Molecular Dynamics 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0333.pdf 
 Identifier    ZNB-1984-39b-0333 
 Volume    39 
6Author    Requires cookie*
 Title    Mössbauer-spektroskopische Untersuchungen an Na2MnFeF7  
 Abstract    Mössbauer Spectroscopic Investigation of N a2M nFeF7 J . P e b l e r , K. S c h m i d t , D. B a b e l und W. V e r s c h a r e n In contrast to the Mössbauer spectrum of the orthorhombic compound Na2N iF eF 7 that of the manganous compound Na2MnFeF7 gives evidence of two different iron positions. This rules out Na^MnFeF? to be isostructural with N a2N iF eF 7 , which crystallizes like most compounds Na2MHMin F 7 in the weberite structure, the M111 ions occupying only one site in space group Im m 2-C |°. The Mössbauer data evaluated for the two iron sites (Fe 1 /Fe 2 respectively) in Na2MnFeF7 are: 0 = 0/90°, cp = undetermined/700, rj — 0.6 both, H = 551/541 kOe, Vzz = + 2 .7 • 1018 Vcm-2 both. NaMnFeF7 is antiferromagnetic with a Neel temperature of Tn — 94 K for both iron positions. 
  Reference    (Z. Naturforsch. 32b, 369—372 [1977]; eingegangen am 27. Dezember 1976) 
  Published    1977 
  Keywords    Mössbauer Spectra, Internal Field, Field Gradient 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0369.pdf 
 Identifier    ZNB-1977-32b-0369 
 Volume    32 
7Author    Jürgen Pebler, Wolfgang PetzRequires cookie*
 Title    Mössbauer-Untersuchungen an Eisencarbonylkomplexen m it Carben-, Alkoxycarbonyl-und Carbamoylliganden Mössbauer Investigations of Iron Carbonyl Complexes w ith Carbene, Alkoxycarbonyl and Carbamoyl Ligands  
 Abstract    The Mössbauer parameters of (CO^FeL complexes were determined, were L are carbon ligands. The isomer shifts show strong ^-interactions, if backbonding from the substituents ofthe carbon atom is possible. The quadrupole splitting of [(CO)4FeCONMe2]2Ni indicates a coordination number of six for the iron atoms with iron-nickel interactions. 
  Reference    (Z. Naturforsch. 32b, 1431—1434 [1977]; eingegangen am 8. August 1977) 
  Published    1977 
  Keywords    Mössbauer Spectra, Iron Carbonyl Complexes, Carbenoid Ligands 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1431.pdf 
 Identifier    ZNB-1977-32b-1431 
 Volume    32 
8Author    Günter Schmid, Eckhard WelzRequires cookie*
 Title    Synthese und Eigenschaften von /^-Silandiyl-Eisencarbonylen [1] Synthesis and Properties of //2-Silanediyl Iron Carbonyls [1]  
 Abstract    The synthesis of dinuclear complexes of the types [(CO)4FeSiR 1 R 2 ]2 and Fe2(CO)7(SiR 1 R 2)2 is described. IR, mass and Mössbauer spectroscopic data are discussed. 
  Reference    Z. Naturforsch. 34b, 929—933 (1979); eingegangen am 29. Januar/27. März 1979 
  Published    1979 
  Keywords    ^2-Silanediyl, Iron Carbonyls, IR, Mass Spectra, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0929.pdf 
 Identifier    ZNB-1979-34b-0929 
 Volume    34 
9Author    Fritz Seel, Rudi Lehnert, Eckhard Bill, Alfred TrautweinRequires cookie*
 Title    Produkte der Umsetzung des Pentacarbonyleisens mit N-substituierten Imidazolen Products of the Reaction of Pentacarbonyl Iron with N-Substituted Imidazoles  
 Abstract    1-Methyl-, 1-ethyl-, 1,2-dimethyl-and 1,2,3,4-tetramethylimidazole react with penta-carbonyliron to yield [FeIm6][Fe(CO)8] (1), [FeIm6][Fe(CO)4]2 (2), [FeIm4][Fe(CO)4] (3) and Fe(Im)(CO)2 (4) (Im = substituted imidazole). The crystal and molecular structures of 1 and 2 have been determined by X-ray diffraction. For 1 and 2 agreement between calculated and measured Mössbauer absorption intensities was obtained by taking into account Debye-Waller-factors, which were derived from the X-ray diffraction experiments. 
  Reference    Z. Naturforsch. 35b, 631—638 (1980); eingegangen am 18. Dezember 1979 
  Published    1980 
  Keywords    Imidazole Derivatives, Pentacarbonyl Iron, Crystal Structure, Molecular Structure, Mößbauer Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0631.pdf 
 Identifier    ZNB-1980-35b-0631 
 Volume    35 
10Author    Herbert Schumann, Heinrich NeumannRequires cookie*
 Title    Organometallphosphin-substituierte Übergangsmetallkomplexe, XXVII [1] Reaktionen von Pentacarbonylmangan-und Pentacarbonylrheniumbromid mit Organoelement(rVb)phosphinen Organometalphosphine-Substituted Transition Metal Complexes, XXVII [1] Reactions of Pentacarbonylmanganese-and Pentacarbonylrheniumbromide with Organoelement(IVb) Phosphines  
 Abstract    The reactions of pentacarbonyl manganese bromide and pentacarbonyl rhenium bromide with di(ter£-butyl)trimethylsilyl phosphine, teri-butyl-bis(trimethylsilyl)-, -(germyl)-, -(stannyl) phosphine, as well as with tris(trimethylsilyl)-, -(germyl)-, and -(stannyl) phosphine result in the elimination of one CO ligand and the formation either of corresponding bromo-tetracarbonyl(organometalphosphine)manganese or -rhenium complexes or of corresponding octacarbonyl-bis(/z-organometalphosphido)dimanganese or -dirhenium complexes. The IR, NMR, and Mössbauer spectra are reported and discussed. 
  Reference    Z. Naturforsch. 36b, 708—712 (1981); eingegangen am 27. Februar 1981 
  Published    1981 
  Keywords    Organometal Phosphines, Tetracarbonylmanganese Complexes, Tetracarbonylrhenium Complexes, NMR Spectra, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0708.pdf 
 Identifier    ZNB-1981-36b-0708 
 Volume    36 
11Author    P. Gütlich, B. Lehnis, K. Römhild, J. SträhleRequires cookie*
 Title    Gemischtvalente Bromoaurate(I,III) und ihre Mößbauer-Spektren Mixed Valent Bromo Aurates(I.III) and their Mößbauer Spectra  
 Abstract    New nonstoichiometric cesium bromo aurates(I,III) Csi+a;(AuBr4)(AuBr2, Br3,Br)z have been synthesized, in which the almost equally shaped anions AuBro -and Br3~ can inter-change themselves. The compounds crystallize in a disordered cubic perovskite structure with a = 547.5 pm or in a tetragonal superstructure with a 16-fold perovskite cell (a = 1553, c = 1099 pm). The investigations show that other bromoaurates as the previously reported "Cs2AgAuBr6" can contain perceptible amounts of Br3 _ ions also. The IR and 197 Au Mössbauer spectra of the new bromoaurates and of Cs2AuoBr6 are discussed. 
  Reference    Z. Naturforsch. 37b, 550—556 (1982); eingegangen am 12. Januar 1981 
  Published    1982 
  Keywords    Mixed Valent Bromo Aurates(I, III), Synthesis, Structure, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0550.pdf 
 Identifier    ZNB-1982-37b-0550 
 Volume    37 
12Author    B. Gyurcsik3, N. Buzásb, T. Gajdab, L. Nagyb, E. Kuzmannc, A. Vértesc, K. BurgerbRequires cookie*
 Title    The Stability and Structure of Complex Species Formed in Equilibrium Reactions of Diethyltin(IV) with N-D-Gluconylamino Acids in Aqueous Solution  
 Abstract    Complex formation equilibria of diethyltin(IV) with five TV-D-gluconylamino acids in aque­ ous solution (I = 0.1 M, NaC104) were studied and the stabilities of the species were deter­ mined by potentiometric titrations. Diethyltin(IV) complexes of a-amino acid derivatives are water-soluble in the physiological pH range, while in the presence of 7V-D-gluconyl-/?-alanine a precipitate is formed, which dissolves with increasing pH. 13C NM R measurements showed that in the /V-D-gluconyl-a-amino acid complexes the ligand is coordinated through its depro-tonated carboxylate oxygen, amide nitrogen and C(2)-hydroxy group, while for the soluble /V-D-gluconyl-/?-alanine complex the ligand is coordinated via the deprotonated carboxylate and C(3)-, C(4)-, C(5)-hydroxy groups. Mössbauer measurements reflected the geometry of the complexes formed. 
  Reference    Z. Naturforsch. 50b, 515—523 (1995); received September 28 1994 
  Published    1995 
  Keywords    Diethyltin(IV), /V-D-Gluconylamino Acid Complexes, Potentiometry, Mössbauer Spectra, NM R Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0515.pdf 
 Identifier    ZNB-1995-50b-0515 
 Volume    50 
13Author    Sima Rabbani, Erwin RiedelRequires cookie*
 Title    Verteilung und Valenz der Kationen im Spinellsystem ZnFeGa04-F e 2G a 0 4 Distribution and Valence of the Cations in the Spinel System Z n F eG a 0 4-F e 2G a 0 4  
 Abstract    For the spinel system Zn1_A ;F e^ G a/l(Fe1+/lG a1_ /l)04 the index X has been determined by X-ray measurements: X = 0 in the region 0 < x < 0,35; the increase of X to 0,62 within 0,35 < x < 1 is nearly linear. The distribution of Fe2+ and Fe3+ ions over the lattice sites has been derived from lattice constants and ionic distances, and also by Mössbauer spectroscopy. In the spinels with x < 0,3 the tetrahedral sites are preferably occupied by Fe2+ ions, for x > 0,5 Fe3+ ions dominate. At x = 0,4 the occupation of the lattice sites by iron ions is statistical, the high temperature Mössbauer spectrum shows a single line only. All spinels are n-type hopping conductors mainly conducting via the octahedral sites. 
  Reference    (Z. Naturforsch. 51b, 47—51 [1996]; eingegangen am 30. Juni 1995) 
  Published    1996 
  Keywords    Iron Gallium Spineis, Cation Distribution, Valence Distribution, Mössbauer Spectra, Seebeck Coefficients 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0047.pdf 
 Identifier    ZNB-1996-51b-0047 
 Volume    51