Ordering and phonons in Ba3CaNb2O9 complex perovskite

Behavior of the ratio ΨCa,Nb in function of the sintering temperature and of the sintering time for BCN ceramics. [Display omitted] •We obtained for the first time Ba3CaNb2O9 samples by Pechini modified method.•We investigated in detail the order kinetics of Ba3CaNb2O9 by Raman spectroscopy under temperature and time sintering changes.•We classified the phonons observed in Ba3CaNb2O9 using an ab initio method. In this work we performed a detailed investigation about ordering in Ba3CaNb2O9 perovskite. The sintering temperature and time were changed to obtain samples with different ordering. The order parameters were probed by Raman spectroscopy based on a partial disordered model. To use the partial disordered model correctly we performed ab initio calculations in Ba3CaNb2O9 to assign the optical phonons. The results showed that sintering temperature improves order while sintering time is not so efficient to promote order.