Analytical expression for pyroelectric coefficient p for the compounds with wurtzit structure is given. Obtained values of p for AlN and GaN are in satisfactory agreement with the first-principles calculations. Pyroelectric effect in the uniform epitaxial films and heterostructures is discussed. Keywords: pyroelectric coefficient, wurtzite structure, monocrystal, thin film, heterostructure.
For the bulk and monolayer IV group carbides in the scope of Keating and/or Harrison models analytical expressions are obtained for second order elastic constants cij, sound velocities v, third order elastic constants cijk, pressure dependencies of cij and v, Grneisen constant, thermal expansion coefficient and temperature dependence of bulk moduli. It is shown that in the row of SiC-GeC-SnC values of all considered characteristics decrease while thermal expansion coefficient increases. All the model estimations are compared with experimental data and calculating results of other authors. Keywords: force constants, elastic constants, sound velocities, anharmonic characteristics.
Model of C-AB-D Janus structure as the compound formed by theinteracting through atoms A and B dimers A-C and B-D, where A and B atoms are in the sites of two-dimensional hexagonal lattice and C and D atoms are on the opposite sides from AB list is proposed. In the scope of tight-binding theory and Green's function method general equation for the dispersion low is obtained. The particular cases of C-AA-D and A-AB-B compounds are considered and analytical expressions for theirelectronic spectra is fulfilled. The effect of the external mechanicaldeformation on the band parameters including effective masses is examined. Problem of the magnetic states in Janus compounds is discussed. Keywords: model of interacting dimers, electronic spectrum, effectof deformation, magnetic states.\
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