Propiedades Estructurales Y Electrónicas Mediante Primeros Principios Del Sistema BiGdO3
Resumen
Se utilizó el método de Ondas Planas Aumentadas y Diagolizadas FP-LAPW con la Aproximación de Gradiente Generalizado (GGA), dentro del formalismo que provee la teoría del Funcional de Densidad (DFT) para estudiar las propiedades estructurales y electrónica del BiGdO3, con parámetro de red a=8.2836 Bohr en su estructura cúbica, con grupo de simetría Pm-3m. A pesar de su aplicación tecnológica, no existe trabajo teórico acerca este material. El estudio estructural consistió en deducir las energías de cohesión en función del parámetro de red. Luego se realiza una gráfica de energía contra volumen y de allí mediante ajuste a la ecuación de estado de Murnaghan se determinó el módulo de volumen y su derivada con respecto a la presión; además, se optimizaron el valor de la constante de red. En el estudio de las características electrónicas se han determinado curvas de energía en contra número de onda (k) y la densidad de estados (DOS) con spin.
The full potential linearized plane wave (FP-LAPW) method and the generalized gradient aproximation (GGA) were performed in the framework of density functional theory (DFT) by calculating the structural and electronic properties of BiGdO3 with cubic structure and symmetry group pm-3m and lattice parameter a = 8.2836 Bohr. The cohesion energy was deduced as a function of the lattice constant. A plot of energy as a function of volume is given and this is adjusted by means of Murnaghan equation thus determining the bulk modulus which is derived as a function of pressure. In addition we have optimized the lattice constant value. In this study of electronics characteristics the curves of energy as a function of wave number and density of states (dos) with spin is determined.
The full potential linearized plane wave (FP-LAPW) method and the generalized gradient aproximation (GGA) were performed in the framework of density functional theory (DFT) by calculating the structural and electronic properties of BiGdO3 with cubic structure and symmetry group pm-3m and lattice parameter a = 8.2836 Bohr. The cohesion energy was deduced as a function of the lattice constant. A plot of energy as a function of volume is given and this is adjusted by means of Murnaghan equation thus determining the bulk modulus which is derived as a function of pressure. In addition we have optimized the lattice constant value. In this study of electronics characteristics the curves of energy as a function of wave number and density of states (dos) with spin is determined.
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