There are many applications in modern science in which a very precise knowledge of atom spacings i.e. lattice parameters is crucial. These include multi layer hetero structures in device manufacturing and core-rim nano particles, for example. In general it is interesting to know the change in spacings – or the strain in the proximity of a lattice defect or a coherent interface between two diffe...

MeV ion irradiation of GaAs crystals at room temperaure has shown that the lattice strain perpendicular to the sample surface saturates to ~ 0.47. for <100> cut and ~ 0.3% for <111> and <110> cut crystals with zero parallel strain in all cases. In this paper , the thermal recovery behavior of the saturated strain in GaAs (100) is presented for a 15 min isochronal annealing . The recovery of str...

We report the intrinsic electronic properties of LiFePO4 (LFP) with different particle sizes measured by broad-band impedance spectroscopy and diffuse reflectance spectroscopy. The electronic properties show typical size-dependent effects with decreasing particle size (up to 150 nm). However, at the nanoscale level, we observed an enhancement in the polaronic conductivity about an order of magn...

The role of elastic strain for magnetoelectric materials and devices is twofold. It can induce ferroic orders in thin films of otherwise non-ferroic materials. On the other hand, it provides the most exploited coupling mechanism in two-phase magnetoelectric materials and devices today. Complex oxide films (perovskites, spinels) are promising for both routes. The strain control of magnetic order...

Strain confinement in heterostructured films significantly affects ionic conductivity of the electrolytes for solid oxide fuel cells based on a multi-layered design strategy. Nearly ideal tensile strain can be achieved by a dedicated manipulation of the lattice mismatch between adjacent layers and fine control of the layer thicknesses to minimize the formation of dislocations and thus to achiev...

The role of elastic strain for magnetoelectric materials and devices is twofold. It can induce ferroic orders in thin films of otherwise non-ferroic materials. On the other hand, it provides the most exploited coupling mechanism in two-phase magnetoelectric materials and devices today. Complex oxide films (perovskites, spinels) are promising for both routes. The strain control of magnetic order...

High energy 2D X-ray powder diffraction experiments are widely used for lattice strain measurement. The 2D to 1D conversion of diffraction patterns is a necessary step used to prepare the data for full pattern refinement, but is inefficient when only peak centre position information is required for lattice strain evaluation. The multi-step conversion process is likely to lead to increased error...

Rhenium disulfide (ReS2) is a semiconducting two-dimensional material with marked in-plane structural anisotropy. This lattice anisotropy the stem of many quasi-1D properties observed in this material. In work, we focus on strain engineering optical and vibrational through mechanical deformations lattice. particular, exciton energy can be shifted by applying uniaxial strain, gauge factor six ti...

Generalized formulae for the strain energy of hexagonal thin films on both hexagonal and rhombohedral substrates have been developed. These formulae require knowledge of the elastic stiffness coefficients and the lattice parameters of the film and only the lattice parameters of the substrate. Example calculations of the strain energy present in the strained film-substrate material combinations ...

The unique lattice structure and properties of graphene have drawn tremendous interests recently. By combining continuum and atomistic approaches, this paper investigates the mechanical properties of single-atomic-layer graphene sheets. A theoretical framework of nonlinear continuum mechanics is developed for graphene under both in-plane and bending deformation. Atomistic simulations are carrie...