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Presents a study which examined the effects of aluminum substitution on the magnetic properties of R cobalt[sub5], where R= ytrrium, praseodymium, neodymium and samarium. Impact of aluminum substitution on cobalt sublattice moments; Methods; Results.

Presents a study that examined the effect of aluminum substitution on the magnetic properties of rare earth cobalt[sub5]. Experimental procedures; Results and discussion.

Presents a study which examined the effect of cobalt and aluminum substitutions for iron in PrFeB sintered magnets and heat treatment on their properties. Materials and methods used; Comparison of the optimum magnetic properties of R-Fe-B and R-Fe-Co-Al-B magnets; Description of the demagnetization curves for Pr[sub15]Fe[sub62.5]Co[sub16]Al[sub1]B[sub5.5] magnets; Effect of post-sintering heat-treatment quench temperature in Pr-Fe-Co-Al-B magnets.

This study explores the effect of several enhancing methods, namely acid wash pretreatment, ultrasound treatment and addition of nickel catalyst on the nitrate removal efficiency of three zero-valent metals - iron, aluminium and zinc. It is hoped that by learning about the major reaction pathways of nitrate removal with zero-valent metals and the main factors influencing the reactivity of those zero-valent metals, optimum process conditions may be identified. The study results show that direct transfer of electrons is the major reaction pathway. Thus increasing a clean, fresh metal surface and decreasing the thickness of the diffusion layer to accelerate mass transfer are the main determinants of reaction rate. In the absence of a clean, fresh metal surface, the catalytic reaction of nickel becomes the primary removal pathway. [ABSTRACT FROM AUTHOR]