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short communications
Slightly twinned and untwinned single crystals of Ba2NaNb5O15 have been studied by X-ray techniques. Oscillation and full rotation X-ray photographs show the c axis to be twice the previously reported value; therefore, there are 8 formula units per unit cell. It was also found that Cmm2 (C2v11) is not the correct space group assignment for the crystals studied, and that Ccc2 (C2v13) appears to be likely.