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'Mössbauer spectroscopy' in keywords Facet   section ZfN Section B  [X]
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1Author    H. P. FritzRequires cookie*
 Title    The Stannides RE R hSn (RE = Ho -Yb) and ScTSn (T = Pd, Pt) -Structure Refinements and 119Sn Mössbauer Spectroscopy  
 Abstract    The stannides RERhSn (RE = Ho -Yb) and ScTSn (T = Pd, Pt) were prepared by reaction of the elements in sealed tantalum tubes in a high-frequency furnace, by arc-melting, or by a tin-flux technique in quartz tubes. The rhodium based stannides crystallize with the ZrNiAl type structure, space group P62m. The four structures were refined from single crystal X-ray data: a = 754.5(3), c = 377.1(1) pm, wR2 = 0.0357, 233 F 2 values for HoRhSn, a = 753.3(1), c = 372.16(8) pm, wR2 = 0.0721, 233 F 2 values for ErRhSn, a = 753.7(3), c = 369.0(2) pm, wR2 = 0.0671,233 F 2 values for TmRhSn, and a = 753.17(5), c = 366.53(4) pm, wR2 = 0.0566, 180 F 2 values for YbRhSn with 14 parameters for each refinement. ScPdSn and ScPtSn adopt the HfRhSn type, a superstructure of ZrNiAl, space group P62c: a = 747.5(1), c = 710.2(1) pm, for ScPdSn, and a = 738.37(9), c = 729.47(9) pm, wR2 = 0.0452,369 F 2 values, 18 variables for ScPtSn. Structural motifs in these stannides are transition metal centered trigonal prisms formed by the rare earth and tin atoms. While these prisms are regular in the rhodium based stannides, significant distortions occur in ScPdSn and ScPtSn. The formation of the superstructure can be ascribed to packing reasons. The shortest interatomic distances occur between the transition metal (T) and tin atoms. These atoms form three-dimensional [FSn] networks in which the rare earth atoms fill distorted hexagonal channels. The series RERhSn displays a somewhat unique behavior. The a lattice parameter is more or less independent of the rare earth element, while the c lattice parameter shows the expected lanthanoid contraction. ll9Sn Mössbauer spectroscopic data of the rhodium stannides show signals at isomer shifts varying from 1.77 to 1.82 mm/s subject to quadrupole splitting between 0.75 to 0.82 mm/s. 
  Reference    Z. Naturforsch. 56b, 589—597 (2001); received April 12 2001 
  Published    2001 
  Keywords    Stannides, Crystal Structure, Mössbauer Spectroscopy 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0589.pdf 
 Identifier    ZNB-2001-56b-0589 
 Volume    56 
2Author    Erwin Riedel, Till Dützmann, Norbert PfeilRequires cookie*
 Title    Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, I Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnV204-ZnFe204 Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, I X-ray Investigation and Mössbauer Spectra of the Spinel System ZnVzCL-ZnFeofL  
 Abstract    The spinel system Zn[FexV2-a;]04 has been prepared by heating mixtures of ZnV2C>4 and ZnFe204 at 1000 °C. The lattice constants increase linearly with x by 3.6 pm, the oxygen parameters are constant with a mean value u = 0.384s. The parameters of room temperature Mössbauer spectra show that in the whole series V(III) and Fe(III) are present. Im I. Teil der Mitteilungsreihe wird über Unter-suchungen der Valenzverteilung in der Mischkri-stallreihe Zn[V2]04-Zn[Fe2]04 mit der Mößbauer-Spektroskopie berichtet. Die Gitterkonstanten, See-beck-Koeffizienten und IR-Spektren des Systems sind bereits gemessen worden [25]. Das Mößbauer-Spektrum von ZnFe2(>4 wurde schon mehrfach ge-messen und die Quadrupolaufspaltung berechnet [13, 14]. In früheren Untersuchungen [15, 16] konn-te durch Messung des Seebeck-Koeffizienten am Spinell ZnFeV04, in den Fe 2+ -Ionen bzw. V 4 +-Ionen eingebaut wurden, die Valenzverteilung Zn[Fe 3 +V 3+ ]04 ermittelt werden. Für die Energie des Elektronenübergangs Fe 3 + + V 3+ Fe 2 + + V 4+ wurde 0,35 eV bestimmt. 2. Untersuchungsmethoden Die Untersuchungsmethoden werden an dieser Stelle für die gesamte Mitteilungsreihe zusammen-fassend beschrieben. Die Röntgenuntersuchung erfolgte mit einer Gui-nier-deWollf-Kamera (CuKa-Strahlung) und mit einem Philips-Diffraktometer (CrKa-Strahlung). Als Eichsubstanz wurde Goldpulver benutzt. Als rönt-genographisch phasenrein betrachtet werden Sub-stanzen, bei denen die stärksten Fremdreflexe der Goniometeraufnahmen weniger als 0,5% der In-tensität des stärksten Spinellreflexes besitzen. Die Gitterkonstante wurde aus 
  Reference    Z. Naturforsch. 35b, 1257—1260 (1980); eingegangen am 2. Juni 1980 
  Published    1980 
  Keywords    Zinc-Iron-Vanadium Spineis, Mössbauer Spectroscopy, Valence Distribution 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1257.pdf 
 Identifier    ZNB-1980-35b-1257 
 Volume    35 
3Author    Erwin Riedel, Hümeyra AnikRequires cookie*
 Title    Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems FeV204-ZnV204 Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, IV X-Ray and Mössbauer Investigation of the Spinel System FeV204-ZnV204  
 Abstract    In the spinel system FeV204-ZnV204 pure Fe(II)-spinels could not be prepared. Möss-bauer spectra show that the solid solution has the composition Fea; 2+ Zni_2:[P 1 e2/ 3+ V2-2/]04, y depending on the partial pressure of oxygen during preparation. The reaction of 1/3 Fe + 1/3 Fe203 -+-V2O3 in a closed tube was also studied by X-ray and Mössbauer investigation. 
  Reference    Z. Naturforsch. 38b, 1630—1634 (1983); eingegangen am 14. Juli 1983 
  Published    1983 
  Keywords    Zinc-Iron-Vanadium-Spinels, Mössbauer Spectroscopy, Cation Distribution 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1630.pdf 
 Identifier    ZNB-1983-38b-1630 
 Volume    38 
4Author    Erwin Riedel, Hümeyra Anik, Till DützmannRequires cookie*
 Title    Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, III Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnFeV04-Fe304 Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, III X-ray Investigation and Mössbauer Spectra of the Spinel System ZnFeV04-Fe304  
 Abstract    The spinel system Zni_zFe2:[Fei+2;Vi_I]04 has been prepared by heating mixtures of ZnFeV(>4 and Fe3Ü4 at 1000 °C. The lattice constants, the oxygen parameters and the Mössbauer parameters show that a transition from a nearly normal to an inverse distribu-tion of Fe(II) and Fe(III) exists. 
  Reference    Z. Naturforsch. 36b, 1228—1233 (1981); eingegangen am 4. Mai 1981 
  Published    1981 
  Keywords    Zinc-Iron-Vanadium Spineis, Mössbauer Spectroscopy, Valence Distribution, Charge Hopping 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1228.pdf 
 Identifier    ZNB-1981-36b-1228 
 Volume    36 
5Author    Rolf-Dieter Hoffmann3, Dirk Kußmanna, Ute Ch, Rainer Rodewald3, Pöttgen3, Carsten Rosenhahnb, BerndD. MoselbRequires cookie*
 Title    New Stannides CaTSn2 (T = Rh, Pd, Ir) and Ca2Pt3 Sn5 -Synthesis, Structure and Chemical Bonding  
 Abstract    New stannides CaTSm (T = Rh, Pd, Ir) and Ca2P hSn5 were prepared as single phase materials by a reaction o f the elements in glassy carbon crucibles under flowing purified argon. The four compounds were investigated by X-ray diffraction both on powders and single crystals and their structures were refined from single crystal data. The stannides CaTSn2 (T = Rh, Pd, Ir) adopt 
  Reference    Z. Naturforsch. 54b, 709 (1999); received February 25 1999 
  Published    1999 
  Keywords    Intermetallic Calcium Compounds, Crystal Structure, Mössbauer Spectroscopy, Chemical Bonding 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0709.pdf 
 Identifier    ZNB-1999-54b-0709 
 Volume    54 
6Author    Dirk Kußmann3, Rainer Pöttgen, Ute Ch, Carsten Rodewald3, BerndD. Rosenhahnb, Gunter Moselb, Bernd Kotzyba3, Künnen3Requires cookie*
 Title    Structure and Properties of the Stannide Eu2Au2Sn5, and its Relationship with the Family of BaAl4-Related Structures  
 Abstract    The stannide Eu2Au2Sn.i was prepared by high-frequency melting of the elements in a sealed tantalum tube. The structure of Eu-iAu^Sn^ was refined from single crystal X-ray data: P2\/m, a = 928.6(2), b = 465.8(2), c = 1042.9(3) pm, ß = 92.28(2)°, wR2 = 0.0653, 1220 F2 values and 56 variables. The structure of Eu2Au2Sns is of a new type, it can be considered as an ordered defect variant of the BaAU type. Due to the ordered defects, the coordination number (CN) of the two crystallographically different europium sites is reduced from CN 16 to CN 14. The gold and tin atoms in Eu2Au2Sn_s form a complex three-dimensional [A ^Sns] polyanion in which the europium atoms are embedded. Within the polyanion short Au-Sn and Sn-Sn distances are indicative of strongly bonding Au-Sn and Sn-Sn interactions. A detailed group-subgroup scheme for various ordered and defect variants of the BaAU family is presented. EuiA^Sn? shows Curie-Weiss behavior above 50 K with an experimental magnetic moment of 7.90(5) /ub/Eu, indicating divalent europium. Antiferromagnetic ordering is detected at 5.8(5) K at low fields and a metamagnetic transition occurs at a critical field of 1.4(2) T. Eu2Au2Sns is a metal with a specific resistivity of 150±20 p f i cm at room temperature. The results of l:i|Eu and 119Sn Mössbauer spectroscopic experiments are compatible with divalent europium and show complex hyperfine field splitting with a transferred magnetic hyperfine field at the tin nuclei at low temperature. 
  Reference    Z. Naturforsch. 54b, 1155—1164 (1999); received June 7 1999 
  Published    1999 
  Keywords    Europium Gold Stannide, Crystal Structure, Mössbauer Spectroscopy, Group-Subgroup Relations 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1155.pdf 
 Identifier    ZNB-1999-54b-1155 
 Volume    54 
7Author    Erwin Riedel, Norbert PfeilRequires cookie*
 Title    Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, II Röntgenographische Untersuchung, Seebeck Koeffizienten, Mößbauer-und IR-Spektren der Mischkristallreihen Fe2V04-ZnV204 und Fe2V04-ZnFe204 Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, II X-ray Investigation, Seebeck Coefficients, Mössbauer and IR Spectra of the Solid Solutions Fe2V04-ZnV204 and Fe2V04-ZnFe204  
 Abstract    The spinel series Fe2V04-ZnV204 and Fe2V04-ZnFe204 have been prepared and investigated. The lattice constants and Mössbauer spectra lead to a distribution of cations which proves that Fe2V04 is a partially inverse spinel with Fe(II) and Fe(III) on the tetrahedral site. The Seebeck effect is interpreted with a model of both tetrahedral and octahedral conduction based on charge hopping. 
  Reference    Z. Naturforsch. 35b, 1261—1267 (1980); eingegangen am 2. Juni 1980 
  Published    1980 
  Keywords    Zinc-Iron-Vanadium Spineis, Mössbauer Spectroscopy, Seebeck Effect, Charge Hopping, Cation Distribution 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1261.pdf 
 Identifier    ZNB-1980-35b-1261 
 Volume    35 
8Author    Z. NaturforschRequires cookie*
 Title    Zinn(IV)  
 Abstract    Komplexe mit diaciden Azo(hydrazono)verbindungen. Kristallstruktur von Bis[4-(2'-hydroxyphenylazo)-3-methyl-l-phenyl-pyrazol-5-onato(2-)]zinn(IV) Tin(IV) Complexes with Diacidic Azo(hydrazono) Compounds. Crystal Structure of Bis[4-(2'-hydroxyphenylazo)-3-methyl-l-phenyl-pyrazol-5-onato(2-)]tin(IV) Wolfgang Banße3, Tin(IV) complexes of diacidic azo and hydrazono compounds were synthesized by the reaction of these ligands with SnCl2acac2 and SnCl2 • 2H20 , respectively. The complexes were further characterized by Mössbauer spectroscopy. For bis[4-(2'-hydroxyphenylazo)-3-methyl-l-phenyl-pyrazol-5-onato(2-)]tin(IV) force field calculations have been performed and the crystal structure was determined by X-ray analysis. 
  Reference    Z. Naturforsch. 52b, 237—242 (1997); eingegangen am 16. Oktober 1996 
  Published    1997 
  Keywords    Tin(I V) Complexes, Diacidic Azo Compounds, Mössbauer Spectroscopy, Molecular Mechanics Study, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0237.pdf 
 Identifier    ZNB-1997-52b-0237 
 Volume    52