BaGd2Mn2O7
Kamegashira, N.Meng JianMori, T.Fukuda, T.Murase, A.Satoh, H.Shishido, T.
Materials Letters (2003) 57, 1941-1944
a=5.5374Å b=5.5374Å c=20.618Å
α=90° β=90° γ=90°