Properties and Applications of Nanocrystalline Alloys from Amorphous Precursors: Proceedings of the NATO Advanced Research Workshop on Properties and Applications … Slovak Republic, from 9 – 15 June 2003.

Properties and Applications of Nanocrystalline Alloys from Amorphous Precursors: Proceedings of the NATO Advanced Research Workshop on Properties and Applications … Slovak Republic, from 9 – 15 June 2003.

Metallic (magnetic and non-magnetic) nanocrystalline materials have been known for over ten years but only recent developments in the research into those complex alloys and their metastable amorphous precursors have created a need to summarize the most important accomplishments in the field. This book is a collection of articles on various aspects of metallic nanocrystalline materials, and an attempt to address this above need.

The main focus of the papers is put on the new issues that emerge in the studies of nanocrystalline materials, and, in particular, on (i) new compositions of the alloys, (ii) properties of conventional nanocrystalline materials, (iii) modeling and simulations, (iv) preparation methods, (v) experimental techniques of measurements, and (vi) different modern applications. Interesting phenomena of the physics of nanocrystalline materials are a consequence of the effects induced by the nanocrystalline structure. They include interface physics, the influence of the grain boundaries, the averaging of magnetic anisotropy by exchange interactions, the decrease in exchange length, and the existence of a minimum two-phase structure at the atomic scale.

Attention is also paid to the special character of the local atomic ordering and to the corresponding interatomic bonding as well as to anomalies and particularities of electron density distributions, and to the formation of metastable, nanocrystalline (or quasi-crystalline) phases built from exceptionally small grains with special properties. Another important focus of attention are new classes of materials which are not based on new compositions, but rather on the original and special crystalline structure in the nanoscale.

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Nanocasting: A Versatile Strategy for Creating Nanostructured Porous Materials

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This book focuses on the synthesis of porous solids from the viewpoint of methodology and introduces the science of nanocasting from fundamental principles to their use in synthesis of various materials. It starts by outlining the principles of nanocasting, requirements to the templates and precursors and the tools needed to probe matter at the nanoscale level. It describes how to synthesize nano structured porous solids with defined characteristics and finally discusses the functionalization and application of porous solids. Special attention is given to new developments in this field and future perspectives. Topics covered include inorganic chemistry, organic chemistry, solution chemistry, sol-gel and interface science, acid-base equilibria, electrochemistry, biochemistry and confined synthesis.

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Ga interdiffusion of substrate during inas nanowire growth.

Chemical composition analysis shows that nanowires were composed of the indium, gallium and arsenic elements, all homogeneously distributed along the nanowire. The presence of Ga in the chemical composition of the nanowire was surprising because only indium and arsenide were used as precursors during the MBE growth. Our results has been found that a strong interdiffusion of gaas (111)B substrate occurs during growth, creating a ternary ingaas alloy in the nanowires