Nitrogen oxides and tropical agriculture

Article Abstract:

There is much evidence that agricultural activities have led to increased nitrous oxide (N(sub2)O) and nitric oxide (NO) emissions. Nitrous oxide is one of the greenhouse gases contributing to the depletion of ozone. Veldkamp, Keller and Nunez, have examined measurements of nitrogen oxide fluxes from soils and argue that fluxes may be substantially higher in tropical regions than in temperate regions. The propose that site selection for flux measurements should consider the differences in soil moisture systems and fertilizer management.

Research, Agriculture, Nitrogen oxides, Nitrogen oxide, Tropics

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Ferroelectricity in oxides

Article Abstract:

R.E. Cohen did not account for dynamical properties in his ascription of ferroelectricity in certain oxides to transition metal-oxygen p-d hybridization effects. R. Migoni and his colleagues have offered a comprehensive view of ferroelectriciy. They hold that the doubly ionized oxygen ion may be necessary for the occurrence of the polar ferroelectric state. Their useful model is not limited to perovskite oxides, and suggests that ferroelectricity derives from dynamic interactions.

Models, Materials, Metallic oxides, Metal oxides, Polarization (Electricity)

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Charge-ordering in oxides

Article Abstract:

Transition elements forming mixed-valence oxides that are expected to have ordered arrangements of d-shell electrons. The transfer in oxides of transition metals possessing 3d shells can lead to multiple charge states for the metal cations.

Analysis, Transition metals, Charge transfer, Chemical properties

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