Aluminum, Gallium, Indium, and Thallium

Akitt, J. W.

doi:10.1007/978-1-4613-1783-8_9

Cited by 26 publications

(14 citation statements)

References 153 publications

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“…LCGG and GCGG have similar shift behavior despite the addition of the magnetic Gd ions, indicating that the GCGG shift is also dominated by the Cr transfer hyperfine field. The fitted chemical shift δ are −82 and −202 ppm for LCGG and GCGG results, respectively, which are within the typical range of Ga chemical shifts Figure d shows the spin–lattice relaxation rate vs temperature using an inversion recovery method.…”

Section: Resultssupporting

confidence: 65%

“…The fitted chemical shift δ are −82 and −202 ppm for LCGG and GCGG results, respectively, which are within the typical range of Ga chemical shifts. 58 Figure 5d shows the spin−lattice relaxation rate vs temperature using an inversion recovery method. T 1 was measured by fitting the data to multiexponential recovery curves for 71 Ga (I = 3/2) central transitions.…”

Section: The Magnetic Specific Heat C M Which Is Obtained Asmentioning

confidence: 99%

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Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

et al. 2020

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In this paper, the hyperkagome lattice of Gd spins in a garnet compound, Gd 3 CrGa 4 O 12 , is studied using bulk measurements and density functional computations, and the observation of large magnetocaloric effect corresponding to an entropy change, ΔS m = 45 J kg −1 K −1 (≈ 45 J mol −1 K −1 ) at 2 K, 8 T is reported. Though the compound defies long-range magnetic order down to 0.4 K, a broad feature below 10 K is observed in the specific heat with two low temperature anomalies at T* ≈ 0.7 K and T S ≈ 2.45 K. The anomaly at T* is reminiscent of one in Gd 3 Ga 5 O 12 , where it is related to the development of a complex magnetic phase, whereas the T S -peak is accounted for by a multilevel Schottky-like model. The spin−lattice relaxation times studied by nuclear magnetic resonance experiments show that the relaxation is dominated by the magnetic fluctuations in Cr which has a longer relaxation time compared to that of the garnet, Lu 3 CrGa 4 O 12 containing a nonmagnetic rare earth. Our firstprinciples density functional theory calculations agree well with the experimental results and support short-range magnetic order in the Gd-sublattice and antiferromagnetism in the Cr-sublattice. The importance of spin fluctuations and short-range order in the rare earth and transition metal lattices in garnets resulting in large magnetocaloric effect is brought out through this work.

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Section: Resultssupporting

confidence: 65%

Section: The Magnetic Specific Heat C M Which Is Obtained Asmentioning

confidence: 99%

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

et al. 2020

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“…Finally, quite in contrast with the useful information given by the IH and 31 p spectra, E7AI-NMR measurements of these reaction mixtures proved to be practically useless, owing to the expected very large broadness of the signals due to the Al-biomolecule complex (Akitt, 1987).…”

Section: Reactivity Of Al(acac)3 (1) and Al(malt)3 (2) With Dppc In Cmentioning

confidence: 99%

Reactivity of Al(III) with membrane phospholipids: a NMR approach

Zambenedetti¹,

Tisato²,

Corain³

et al. 1994

Biometals

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The complexes Al(acac)3 (1) (acac = 2,4-pentanedionate) and Al(malt)3 (malt = 3-hydroxy-2-methyl-4-pyronate) (2) react with DL-alpha-dipalmitoylphosphatidylcholine (DPPC) under a 1:1 molar ratio in CDCl3 at 37 degrees C, as shown by the substantial release of ligands (20-50%) from the metal coordination sphere (1H-NMR), by evident changes in the 1H-NMR spectrum of DPPC in the reaction mixture and by the appearance of a 31P-NMR signal due to metal-coordinated DPPC. 31P-NMR spectra reveal that both 1 and 2 also react with DPPC in water, in the presence of 1% Triton X-100 and Tris buffer. Under these conditions, 1 and 2 do not react with ghosts from human erythrocytes. On the contrary, the far less hydrolytically stable complex Al(lact)3 (lact = lactate) appears to be reactive under identical conditions, as shown by 31P-NMR spectra.

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“…Several related studies have employed 27 Al, 69/71 Ga, and 17 O NMR spectroscopy to investigate the structural features of Keggin-structured Al 13 and Ga 13 oxy-hydroxy cations as well as other ionic cluster species both in the solid and solution states. [20][21][22][23][24][25][26][27][28] While the quadrupolar nature of Al and Ga nuclei often hampers their observation due to a combination of rapid relaxation and very large linewidths (see section 2.4 below), solid-state NMR (ssNMR) nevertheless has provided information on the local coordination environment of gallium sites and the coordination number of aluminum sites (e.g., tetrahedral vs. octahedral) (Table 1). 29,30 NMR methods have long been used to follow reactions affecting the symmetric Keggin-structure ions, but recently, more advanced ssNMR methods have been used to study aluminum and gallium-based hydroxy-aquo cations (referred to earlier as "f-Al 13 " and "f-Ga 13 " and shown in detail in Fig.…”

Section: William Caseymentioning

confidence: 99%

An overview of selected current approaches to the characterization of aqueous inorganic clusters

et al. 2015

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This Perspective article highlights some of the traditional and non-traditional analytical tools that are presently used to characterize aqueous inorganic nanoscale clusters and polyoxometalate ions. The techniques discussed in this article include nuclear magnetic resonance spectroscopy (NMR), small angle X-ray scattering (SAXS), dynamic and phase analysis light scattering (DLS and PALS), Raman spectroscopy, and quantum mechanical computations (QMC). For each method we briefly describe how it functions and illustrate how these techniques are used to study cluster species in the solid state and in solution through several representative case studies. In addition to highlighting the utility of these techniques, we also discuss limitations of each approach and measures that can be applied to circumvent such limits as it pertains to aqueous inorganic cluster characterization.

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Aluminum, Gallium, Indium, and Thallium

Cited by 26 publications

References 153 publications

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order

Reactivity of Al(III) with membrane phospholipids: a NMR approach

An overview of selected current approaches to the characterization of aqueous inorganic clusters

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