自動車工学の進歩
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概要

Oxide properties under different conditions of pressure and temperatures a molecular dynamics simulation

Y. Chergui

Zinc oxide semiconductor is a promised material due to its properties between ionic and covalent band. In this work we investigate molecular dynamics and dl_poly_4 software to analyze the band behavior under the effect of pressures and temperatures. Our system composed of 2916 atoms in a simulation box of 9x9x9 dimension. The range of pressure is 0-200GPa and for temperature is 300-3000K, we will study the variation of the distance between ZnO atoms. Our outcomes are in concurrence with the accessible information because of no more data under past conditions. This outcome is significant in nanosacle and macroscale particularly in industry field and geophysics. Isothermal and isobaric gatherings practices of ZnO wurtzite stage have been researched, by equal atomic elements technique and utilizing Buckingham potential, which contains long-range Coulomb, loathsome remarkable, and alluring scattering terms. To lead our computations, we have utilized dl_poly 4 programming, under which the strategy is actualized. We have inspected the impact of the temperature and tension on molar volume in the scopes of 300–3000 K and 0–200 GPa. Isothermal-isobaric connections, vacillations, standard mistake, balance time, molar volume and its variety versus time are anticipated and dissected. Our outcomes are near accessible trial information and hypothetical outcomes. Boron nitride honeycomb structure is another three-dimensional material like carbon honeycomb, which has pulled in a lot of consideration because of its exceptional structure and properties. In this paper, the malleable mechanical properties of boron nitride honeycomb structures in the crisscross, rocker and pivotal bearings are learned at room temperature by utilizing atomic elements reenactments. Impacts of temperature and strain rate on mechanical properties are likewise talked about. As indicated by the noticed elastic mechanical properties, the piezoelectric impact the crisscross way was examined for boron nitride honeycomb structures. The acquired outcomes demonstrated that the disappointment strains of boron nitride honeycomb structures under pliable stacking were up to 0.83, 0.78 and 0.55 in the rocker, crisscross and hub headings, separately, at room temperature. These discoveries demonstrated that boron nitride honeycomb structures have incredible flexibility at room temperature. Besides, temperature significantly affected the mechanical and ductile mechanical properties of boron nitride honeycomb structures, which can be improved by bringing down the temperature inside a specific reach. What's more, strain rate influenced the greatest elasticity and disappointment strain of boron nitride honeycomb structures. Besides, because of the novel polarization of boron nitride honeycomb structures, they had a magnificent piezoelectric impact. The piezoelectric coefficient e got from sub-atomic elements was 0.702 C/m2 , which was lower than that of the monolayer boron nitride honeycomb structures, e=0.79 C/m2 . Such amazing piezoelectric properties and disappointment strain distinguished in boron nitride honeycomb structures propose a wide possibility for the use of these new materials in novel nanodevices with ultrahigh ductile mechanical properties and ultralight-weight materials. Boron nitride (BN) has a comparative structure to graphene and shows phenomenal mechanical and electrical properties. The two-dimensional BN films have been effectively stripped out by utilizing micromechanical cleavage. These structures uncover high precious stone quality and naturally visible congruity. BN nanobelts are manufactured by a straightforward ZnS nanoribbon templating technique and have great optical properties. The wide utilization of two-dimensional materials in different fields has pulled in light of a legitimate concern for various exploration bunches in three-dimensional materials. A tale boron nitride honeycomb (BNHC) structure comprising of crisscross edged BN nanosheets is proposed by Wu et al. also, they affirmed basic solidness of this material. Specifically, carbon honeycomb (CHC) structures which are like BNHCs, have been effectively manufactured. These honeycomb structures can be utilized for putting away different gases and fluids as well as a lattice for new composite materials. Since the main report by Wang et al. on a model nanogenerator dependent on zinc oxide nanowires, piezoelectric nanomaterials have gotten broad consideration. It has been discovered that BN has a place with the piezoelectric materials and shows great piezoelectric impact. The piezoelectric impact implies that when an outer weight is applied to a piezoelectric material, a potential contrast is created on the outside of the material. On the other hand, a piezoelectric material misshapes when an outer electric field is applied to it. The substance is that when weight is misused to a piezoelectric material, the non-centrosymmetric particles inside the precious stone begins to be energized and results in a likely distinction. Inferable from the synchronous ownership of piezoelectricity and semiconductor properties, the piezopotential made in the precious stone strongly affects the transporter transport at the interface/intersection. The piezoelectric potential created by the mechanical misshapening of a piezoelectric material can be utilized as the entryway voltage to change the transporter transmission qualities and subsequently improves the presentation of photovoltaic gadgets, for example, nanosensors, nanogenerators, nanotransistors, etc. As per the thickness utilitarian hypothesis (DFT) counts, it is discovered that BN nanosheets display more grounded piezoelectric coupling than customary massive Wurtzite structures. The piezoelectric impact of BNHC structures has been dissected by utilizing a blend of limited component and sub-atomic elements reenactments and studies have demonstrated that BNHC structures give a decent piezoelectric impact and piezopotential properties which can be effectively changed by directing the grid steady. Since mechanical properties of a material straightforwardly influence its application in different fields, thusly, it is important to examine this significant boundary. There are numerous investigations on the mechanical properties of BN nanotubes, for instance, the flexible properties of an individual multi-divider BN nanotube is resolved tentatively and the outcomes affirm that these nanotubes are exceptionally translucent with not many deformities. Additionally, mechanical properties of monolayer frameworks of honeycomb structures are examined by utilizing a condition of state (EOS). The results indicate that graphene is the most elastic, followed by BN films and both materials have considerable strength. Inspired by the excellent mechanical properties and wide applications of 2D materials, such as BN nanosheets and graphene, it is reasonable to build three-dimensional materials with excellent mechanical properties. Some studies have shown that mechanical properties of CHC structures bear a strong cell-size effect and anisotropy.