O3SiSr
Machida, K. I.Adachi, G. Y.Shiokawa, J.Shimada, M.Koizumi, M.Suito, K.Onodera, A.
Inorganic Chemistry (1982) 21, 1512-1519
a=6.874Å b=6.894Å c=9.717Å
α=85.01° β=110.57° γ=104.01°
a=7.452Å b=6.066Å c=13.479Å
α=90° β=117.09° γ=90°