Связь макроскопических характеристик твердого тела с энергией связи иона в решетке металлов

The paper examines the relationship between the macroscopic parameters, such as the Young's modulus in the Hooke's law, the sound speed and the Debye characteristic temperature, with the binding energy of an individual atom. A formula for calculating the elastic deformation modulus is proposed. A simple formula is obtained to calculate the sound speed in a metal rod. It is suggested that the Debay characteristic temperature is connected with the binding energy of the ion in the solid lattice.

Future of Nanotechnology

Nanotechnology is the science that studies the use of matter on a nanometric scale. It is the promising means of manipulating individual atom and molecule of an object at the nanoscale. It is an emerging science which is expected to have strong future developments. Although it is hard to predict what will happen to nanotechnology in the next 100 years, we know that nanotechnology will be a powerful tool of science and technology in the future. This paper introduces recent trends in nanotechnology and its future scope. It also addresses known barriers to future progress in nanotechnology and its applications.

On atom–atom `short contact' bonding interactions in crystals

Professor Dunitz questions the usefulness of ascribing crystalline structural stability to individual atom–atom intermolecular interactions viewed as bonding (hence stabilizing) whenever linked by a bond path. An alternative view is expressed in the present essay that articulates the validity and usefulness of the bond path concept in a crystallographic and crystal engineering context.

The Characteristics of the Long-Time Averaged Kinetic Energy of the Atoms in LJ Cluster

Using the standard microcanonical molecular-dynamics method, the behaviors of the individual atoms in the LJ clusters are investigated. It is found that the characteristics of the long-time averaged kinetic energy of the individual atom in the solid-like clusters are related with the symmetry of the clusters. Different symmetries result in different kinetic energy distributions over the atoms of the clusters.

Lifetime analysis of individual-atom contacts and crossover to geometric-shell structures in unstrained silver nanowires

We study the crossover of quantum point contacts from (i) individual-atom contacts to (ii) electronic-shell effects and finally to (iii) geometric-shell effects in electrochemically deposited silver contacts. The method allows the fabrication of mechanically unstrained structures, which is a requirement for determining the individual atomic configuration by means of a detailed lifetime analysis of their conductance. Within the geometric-shell model, the sequence of conductance maxima is explained quantitatively based on the crystal structure data of silver, and the growth mechanism of the nanowires is discussed.