SODIUM NITRIDE ELECTRIDE

One time I wrote down a drawing of a Fm-3m unit cell with sodium cations in the faces and a nitride dianion in the center and electrons on the corners to form a perovskite-like sodium-nitride-electride as a novel inorganic perovskite-electride...I sent the drawing to Professor DiSalvo in 1992 about...he answered me for me to come down to talk to him about nitrides and electrides...I saw him some times after that but we never had a chance to talk about nitrides and electrides...I will make a drawing of the structure some time and scan it in and send the scan to Roald and to Jon with some background comments on it...it might exist