Search results for "Lamb–Mössbauer factor"

showing 3 items of 3 documents

Anomalous pressure dependence of the Lamb-Mössbauer factor in a spin crossover system

1986

The dependence of the f-factor on temperature and on pressure up to 1500 bar has been measured in the spin crossover compound [Fe(2-pic-ND2)3]cl2·EtOD. In the transition region around Tc=146.7 K the pressure dependence of f shows an anomalous increase, which can be explained on the basis of a theoretical model for spin transitions developed by us.

Nuclear and High Energy PhysicsCondensed matter physicsChemistrySpin crossoverLamb–Mössbauer factorPhysical and Theoretical ChemistryPressure dependenceCondensed Matter PhysicsAtomic and Molecular Physics and OpticsSpin-½Bar (unit)Hyperfine Interactions
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Lamb-Mössbauer factor in the spin crossover compound Fe(tpa)(NCS)2

1994

The Lamb-Mossbauer factor in spin crossover compounds has been the subject of controversial discussions in the literature. For several compounds, a significantly larger Lamb-Mossbauer factor for the complex molecules in the low-spin (fls) than in the high-spin (fhs) state has been reported, while for compounds studied in our laboratory such differences could not be observed. We prepared the compound Fe(tpa)(NCS)2, thef factors of which were reported to be very different. We could not prove thef factors of this compound to be different. The implications of a different structural phase of compound prepared by us are discussed.

Nuclear and High Energy PhysicsCrystallographyStructural phaseChemistryStereochemistrySpin crossoverMoleculeLamb–Mössbauer factorPhysical and Theoretical ChemistryCondensed Matter PhysicsAtomic and Molecular Physics and OpticsHyperfine Interactions
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Tin(IV), Monomethyltin(IV), and Dimethyltin(IV) Complexes with thiol sulfur and heterocyclic nitrogen donors: Molecular dynamics and structure by119S…

1995

The molecular dynamics of the complexes Sn(SPyN)4 (1), SnCl2(SPyN)2 (2), MeSn(SPy)3 (3), MeSnCl(SPyN)2 (4), Me2Sn(TCy)2 (5), Me2SnCl(TOx) (6), and Me2Sn(TUr) (7) [HSPy = 2-mercaptopyridine; HSPyN = 2-mercaptopyrimidine; HTCy = 2-thiocytosine; HTOx = 8-thioquinoline; H2TUr = 2-thiouracil] has been investigated by variable temperature 119Sn Mossbauer spectroscopy. The area under the resonant peaks has been determined as function of temperature, from which Debye temperatures and cut-off frequencies, as well as recoil-free fractions (Lamb Mossbauer factor) and mean square displacements of 119Sn, have been calculated. By fingerprint procedures on the basis of literature data, monomeric structure…

chemistry.chemical_classificationchemistry.chemical_elementQuadrupole splittingPolymerInorganic ChemistryCrystalchemistry.chemical_compoundMolecular dynamicsCrystallographyMonomerchemistryMössbauer spectroscopyPolymer chemistryLamb–Mössbauer factorTinZeitschrift f�r anorganische und allgemeine Chemie
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