Unusual magnetic behavior of the amorphous metallic materials M2SnTe4 where M = Co and Ni

Foise, J.W.; O’Connor, Charles J.; Haushalter, Robert C.

doi:10.1016/0038-1098(87)90923-9

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…The onset of photoelectron intensity in the spectrum of PtPb 12 − occurs at 2.8 AE 0.1 eV. The small feature with a maximum at 2.7 eV originates from a contaminant-most likely the mass-coincident Pb 13 − ion. The simulated PE spectrum of PtPb 12 − is overlaid on the experimental PE spectrum presented in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…Moreover, it is not clear if they exist outside of ultrahigh vacuum conditions. Although gas-phase studies of Al 13 − show that it is uniquely stable among the Al n − series, the Pb n − clusters and their endohedral cousins, the Pt@Pb n − clusters, show two species with enhanced stabilityone at n ¼ 10 and another at n ¼ 12. However, the electronic stability of the icosahedral n ¼ 12 clusters, as evidenced by the NMR and PES properties, seems to be superior to the n ¼ 10 series, likely because of the enhanced aromaticity of the icosahedron.…”

Section: Discussionmentioning

confidence: 96%

“…The use of soluble Zintl clusters for the preparation of unique materials was pioneered by Haushalter and O'Connor in the 1980s in their work on magnetic spin glasses, electronic materials, and metallic coatings (8)(9)(10)(11)(12)(13). Since that time, scientists have pursued new materials utilizing various Zintl ion precursors to both ionically and covalently link the cluster anions into oligomers (14)(15)(16)(17)(18), polymers (19,20), network solids (21)(22)(23), and nanomaterials (24)(25)(26).…”

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confidence: 99%

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Photoelectron spectroscopic and computational studies of the Pt@Pb101- and Pt@Pb121-/2- anions

Grubisic

Wang

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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A combination of anion photoelectron spectroscopy and density functional theory calculations has elucidated the geometric and electronic structure of gas-phase endohedral Pt/Pb cage cluster anions. The anions, Pt@Pb 10 1− and Pt@Pb 12 1− were prepared from "preassembled" clusters generated from crystalline samples of ½Kð2,2,2-cryptÞ 2 ½Pt@Pb 12 that were brought into the gas phase using a unique infrared desorption/photoemission anion source. The use of crystalline ½Kð2,2,2-cryptÞ 2 ½Pt@Pb 12 also provided access to K½Pt@Pb n − anions in the gas phase (i.e., the K þ salts of the Pt@Pb n 2− anions endohedral complex is the only bare cluster that has been structurally characterized in the solid state, solution, and the gas phase.endohedral clusters | negative ions | mass spectrometry T he synthesis, characterization, and solution chemistry of the soluble main group polyanions (i.e., Zintl ions) have a 120-y history (1) that has been well reviewed (2-7). The use of soluble Zintl clusters for the preparation of unique materials was pioneered by Haushalter and O'Connor in the 1980s in their work on magnetic spin glasses, electronic materials, and metallic coatings (8-13). Since that time, scientists have pursued new materials utilizing various Zintl ion precursors to both ionically and covalently link the cluster anions into oligomers (14-18), polymers (19,20), network solids (21-23), and nanomaterials (24-26). Simultaneously, gas-phase chemists have prepared bare (e.g., ligand-free) clusters in molecular beams, studied their size-dependent properties, and explored possible condensed-phased manifestations (27-30). Especially notable was the discovery of C 60 (31) in molecular beam experiments and its subsequent macroscopic synthesis (32). Several other cluster species (not yet assembled into solids) show unusual gas-phase stability (e.g., metcar cages Ti 8 C 12 and Zr 8 C 12 , refs. 33 and 34, and Al 13 1− -type cluster anions comprising icosahedral cages of group 13 elements with one atom inside; i.e., Al@Al 12 1− , refs. 27, 35, and 36). Traditional inorganic cluster compounds are stabilized by ligand spheres that reduce cluster-core interactions. By contrast, bare gas-phase clusters devoid of ligands are vulnerable to coalescence. Combining the attributes of both are salts composed of Zintl cluster anions and their countercations. Not only are Zintl cluster anions ligand free with several structural similarities to gas-phase clusters (e.g., Pt@Pb 12 2− is isostructural to Al 13 1− and the As 20 shell of As@Ni 12 @As 20 3− is isostructural to Ti 8 C 12 and C 20 ), but they can also be prepared in macroscopic quantities, fully characterized, and used in subsequent reactions. Several researchers (3,14,(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48) have prepared and isolated a number of salts of endohedral Zintl anion clusters with unprecedented structures and unique properties; e.g., σ-aromaticity, paramagnetism, and remarkable dynamic exchange processes. These "intermetalloid" clusters (3, 5, 48-51) display struct...

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Section: Resultsmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 96%

mentioning

confidence: 99%

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Photoelectron spectroscopic and computational studies of the Pt@Pb101- and Pt@Pb121-/2- anions

Grubisic

Wang

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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“…Neutron diffraction experiments, carried out on olivine samples of Fe 2Àx Zn x SiO 4 , have revealed that, in addition to the above magnetic configurations, short-range magnetic order exists at low temperature [12]. The magnetic results obtained on amorphous samples of II 2 SnTe 4 showed that these materials exhibit spin-glass behavior with an evident weak ferromagnetic component observed at low temperature [13]. However, as indicated by Mikus et al [14], a comprehensive picture for the magnetic properties of this group of materials is still lacking.…”

Section: Introductionmentioning

confidence: 90%

Magnetic properties for the Mn2GeTe4 compound

Quintero

Caldera

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…Amorphous intermetallic chalcogenide compounds have a wide variety of physical characteristics from electrical to magnetic properties, such as semiconducting property, spin-glass behavior, etc . A simple metathesis reaction between divalent transition metal halides and Zintl phase precursors provides amorphous intermetallic chalcogenide compounds. − The syntheses of the amorphous intermetallic chalcogenide compounds of M 3 (SbTe 3 ) 2 and M 3 (GaTe 3 ) 2 (M = Cr, Mn, Fe, Co, Ni) were reported by Jung and co-workers, using Zintl phase precursors of K 3 SbTe 3 and K 3 GaTe 3 , respectively. − Some amorphous intermetallic chalcogenide compounds show spin-glass behavior at the extremely low temperatures of 3−22 K. Under irradiation of laser, a magnetic bubble or magnetic hole is generated below the spin-glass freezing temperature. − These photomagnetic effects in amorphous intermetallic chalcogenide compounds have a potential application of high-density magnetooptic storage medium for erasable magnetic memory devices. For these amorphous intermetallic chalcogenide compounds, however, few spectroscopic studies have been reported to understand the physical characteristics induced by the restricted environments.…”

Section: Introductionmentioning

confidence: 99%

Structural Confinement Effects of Ternary Chalcogenide in Mesoporous AlMCM-41 of Different Pore Diameters

2003

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Structural confinement effects of amorphous ternary chalcogenide of Ni 3 (SbTe 3 ) 2 in mesoporous channels of different pore diameters have been studied. Insertion of the guest into the channels of AlMCM-41 was probed by the results of transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), and photoluminescence (PL) and photoluminescence excitation (PLE). From powder XRD patterns, characteristic diffraction peaks were observed for the ternary chalcogenide incorporated in AlMCM-41, which indicated long-range ordering and increased crystallinity. The competition between the homogeneous broadening and the inhomogeneous broadening of the characteristic XRD peak profiles of the guest chalcogenides are evaluated in a series of the hosts. As the mesopore diameter decreases, the strain is enlarged in the nanosize guest chalcogenide while the estimated particle size from the full width at half-maximum (fwhm) of the respective Lorentzian profiles is similarly preserved. The characteristic energy level, for the nanophase ternary chalcogenide, induced by the strain is gradually red shifted in the nanocomposites with decreasing the pore diameter. The structural confinement causes the suppression of phonon coupling to the photoexcited carriers in the ternary chalcogenide incorporated in AlMCM-41, and the coupling is more suppressed in the nanocomposite of smaller pore diameter. Such phonon suppression induced by the structural confinement results in longer PL lifetimes as the pore diameter decreases.

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Unusual magnetic behavior of the amorphous metallic materials M2SnTe4 where M = Co and Ni

Cited by 11 publications

References 6 publications

Photoelectron spectroscopic and computational studies of the Pt@Pb101- and Pt@Pb121-/2- anions

Photoelectron spectroscopic and computational studies of the Pt@Pb101- and Pt@Pb121-/2- anions

Magnetic properties for the Mn2GeTe4 compound

Structural Confinement Effects of Ternary Chalcogenide in Mesoporous AlMCM-41 of Different Pore Diameters

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