V. ACKNOWLEDGEMENTS This work was supported by the National Natural Science Foundation of China (No.U1204501, No.11304141, No.11105115). We thank Prof. Alberto Qtero-de-laRoza and his colleague for the FEQHA model (Gibbs2 code). We also acknowledge Prof. M. A. Blanco and his co-workers for their QHD model (Gibbs code).
Atomistic modeling based on the accurate first-principles method is used to investigate the lattice parameter, elastic constant, elastic modulus including bulk modulus (B) and shear modulus (G), Poisson's ratio, ...
ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China (No.U1204501, No.11105115, and No.11304141), the Project of Basic and Advanced Technology of Henan Province of China (No.112300410021), and the Key Project of Henan Ed- ucational Committee (No.12A140010). The authors are grateful to Prof. M. A. Blanco from the Departamento de Qufmica Ffsicay Analitica, Faculatad de Qufmica, Universidad de Oviedo for the Gibbs code.
Atomistic modeling based on the density functional theory combined with the quasi-harmonic approximation is used to investigate the lattice parameters and elastic moduli of the P6 and P6' phases of Si3N4. β-Si3N4 is...