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J Mech Behav Biomed Mater. 2014 Apr;32:345-350. doi: 10.1016/j.jmbbm.2013.10.029. Epub 2013 Dec 17.

Computational study of structural, elastic and electronic properties of lithium disilicate (Li(2)Si(2)O(5)) glass-ceramic.

Author information

1
Unité de recherche sciences des matériaux et applications, Département de Physique, Faculté des Sciences Exactes, Université Constantine 1, Constantine 25000, Algérie. Electronic address: biskriz@yahoo.fr.
2
Laboratoire des matériaux magnétiques, Département de physique, Faculté des sciences, Université Djillali LIABES, Sidi-Bel-Abbès 22000, Algérie. Electronic address: habib_rached@yahoo.fr.
3
Unité de recherche sciences des matériaux et applications, Département de Physique, Faculté des Sciences Exactes, Université Constantine 1, Constantine 25000, Algérie.
4
Laboratoire des matériaux magnétiques, Département de physique, Faculté des sciences, Université Djillali LIABES, Sidi-Bel-Abbès 22000, Algérie.

Abstract

The objective of this study is to investigate theoretically the structural, elastic and electronic properties of Lithium Disilicate (LD) crystal (Li2Si2O5), using the pseudo potential method based on Density Functional Theory (DFT) with the Local Density Approximation (LDA) and the Generalized Gradient Approximation (GGA). The calculated structural properties namely the equilibrium lattice parameters and cell volume are in good agreement with the available experimental results. However, for the LD crystal elastic moduli: Shear modulus G, Young's modulus E and Poisson's ratio ν we have found a discrepancy between our theoretical values and experimental ones reported in polycrystalline sample containing LD crystals. The calculated elastic properties show that LD is more rigid compared with other components. We also investigated the mechanical stability of Li2Si2O5 compound and we have noticed that this compound is stable against elastic deformations. On the basis of shear to bulk modulus ratio analysis, we inferred that Li2Si2O5 compound is brittle in nature. In order to complete the fundamental characteristics of this compound we have measured the elastic anisotropy. Our results for the energy band structure and Density of States (DOS) show that Li2Si2O5 compound has an insulator characteristic.

KEYWORDS:

Elastic properties; Electronic properties; Glass-ceramics; Lithium disilicate crystal; Structural properties

PMID:
24411692
DOI:
10.1016/j.jmbbm.2013.10.029
[Indexed for MEDLINE]

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