Electronic, mechanical and piezoelectric properties of glass-like complex NaSi Ge O ( = 0.0, 0.25, 0.50, 0.75, 1.0).

Motivated by our previous work on pristine NaSiO, we proceeded with calculations on the structural, electronic, mechanical and piezoelectric properties of complex glass-like NaSi Ge O ( = 0.0, 0.25, 0.50, 0.75, 1.0) by using density functional theory (DFT). Interestingly, the optimized bond lengths and bond angles of NaSiO and NaGeO resemble each other with high similarity. On doping we report the negative formation energy and feasibility of transition of NaSiO → NaGeO while the structural symmetry is preserved. Analyzing the electronic profile, we have observed a reduced band gap on increasing = Ge concentration at Si-sites. All the systems are indirect band gap (-) semiconductors. The studied systems have shown mechanical stabilities by satisfying the Born criteria for mechanical stability. The calculated results have shown highly anisotropic behaviour and high melting temperature, which are a signature of glass materials. The piezoelectric tensor (both direct and converse) is computed. The results thus obtained predict that the systems under investigation are potential piezoelectric materials for energy harvesting.