First-principles studies of electronic, optical, and mechanical properties of
γ
-Bi
2
Sn
2
O
7
Hu Chao-Hao
1, 2, †,
, Yin Xue-Hui
1, 2
, Wang Dian-Hui
3
, Zhong Yan
1, 2
, Zhou Huai-Ying
1, 2
, Rao Guang-Hui
1, 2
Directional dependence of Young’s modulus of cubic
γ
-Bi
2
Sn
2
O
7
.