Table 1: Some cryslallographic data for the AII3LaM3O12 (AII = Sr, Ba; M = Nb, Ta) compounds.

Compound Sr3LaNb3O12 Sr3LaTa3O12 Ba3LaNb3O12 Ba3LaTa3O12
Distribution of the (AII,La) non-block cations 0,82Sr+ 0,18La 0,75Sr + 0,25La 0,75Ba + 0,25La 0,75Ba + 0,25La
Distribution of the (AII,La) internal cations 0,68Sr + 0,32La 0,75Sr + 0,25La 0,75Ba + 0,25La 0,75Ba + 0,25La
Distortion rates (Δ) of the border layer’s MO6 octahedrons 72 • 10-4 60 • 10-4 37 • 10-4 18 • 10-4
Distortion rates (Δ) of the inner layer’s MO6 octahedrons 0 0 0 0
Crystal data source [27] [33] [32] [11]