Ab initio study of the opto-electronic and elastic properties of MgGaxAl(2 − x)O4 ZhiBin Chen, Honglin Tan, Lan Yu and Chao Xiang Eur. Phys. J. B, 88 11 (2015) 281 Published online: 02 November 2015 DOI: 10.1140/epjb/e2015-60329-5