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An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
ReO3 nanoparticles in the diameter range of 8.5-32.5 nm have been prepared by decomposition of the Re2O7-dioxane complex under solvothermal conditions and characterized by X-ray diffraction, electron microscopy, optical spectroscopy, and scanning probe microscopy. The nanoparticles have the cubic (Pm3m {221} space group) structure with the lattice parameter increasing with decreasing size. The particles are metallic and show a plasmon band around 520 nm, which becomes blue-shifted with a decrease in size. The metallicity of the nanoparticles is also confirmed by tunneling conductance measurements. The nanoparticles show paramagnetic or diamagnetic behavior depending on the size, with evidence for superparamagnetism at low temperatures when the size is small.
Dependence of the magnetic properties of FePt nanoparticles with an average diameter, D, of 5 nm on the interparticle separation, d, has been investigated by employing different spacer molecules. The observed decrease in the blocking temperature and Curie−Weiss temperature with increase in d as well as the increase in saturation magnetization with increase in d have been explained on the basis of a simple model for the case d ≪ D where the magnetic nanoparticles are treated as finite dipoles coupled through anisotropic multipolar interactions.
Amorphous carbon nanotube brushes were prepared by a simple method using glucose as the carbon precursor. The functional surfaces of these nanotubes were covered with gallium ions and then calcined to get gallium oxide nanotube brushes. The gallium oxide nanotube brushes were successfully converted to crystalline GaN nanotube brushes by treatment of ammonia at 800 °C. The method is applicable to make other nanobrushes as well.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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A. K. Cheetham Several compounds are known to exhibit magnetoresistance, a change in electrical resistivity in the presence of magnetic field. Such materials are of interest both for technology and basic science. In their Perspective, Rao and Cheetham discuss recent results on magnetoresistance in rare-earth manganate materials, which exhibit especially interesting fundamental physical phenomena.
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No abstract is provided for this article.
Some energy aspects of the Pm3m—Fm3m transformation of CsCl have been studied quantitatively. Effects of addition of RbCl, KCl and CsBr to CsCl on the transformation have been examined. Above a critical concentration of RbCl or KCl, the transformation becomes irreversible and at much higher concentrations the Fm3m form gets stabilized. Lattice energy differences between the Pm3m and Fm3m forms of CsCl as well as its solid solutions have been calculated employing various forms of the modified Born-Mayer model with three, and four, structure-dependent parameters. Both the three and the four parameter equations are satisfactory when a higher van der Waals term is used. The four parameter equation satisfactorily explains the variation in the transformation energy of the solid solutions of CsCl with the mole fraction of RbCl.
No abstract is provided for this article.
C. N. R. Rao, K. J. Rao, S. Ramasesha, D. D. Sarma and S. Yashonath, Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 1992, 89, 179 DOI: 10.1039/PC9928900179
