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In contradiction to former investigations Cu 3 P- and Cu 3 As are anti-isostructural with LaF 3  (space group P3̄c1, 6 formula units in the unit cell). Phosphorus (arsenic) is surrounded by 11 copper atoms, Cu(1) has 4, Cu(2) and Cu(3) 3 phosphorus (arsenic) atoms as neighbours. It is very likely that α-Li,Sb, Li 3 As, Li 3 P, Na 3 Bi, Na 3 Sb, Na 3 As, Na 3 P, K 3 Bi, K 3 Sb, K 3 As also belong to the Cu 3 P type of structure. These compounds have been described earlier in the so-called Na 3 As type of structure (space group P6 3 /mmc) containing only two formula units in the unit cell.

Über Verbindungen vom Anti-LaF 3 -Strukturtyp