In this work we performed a detailed investigation about ordering in \bcn 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 {\it ab initio} calculations in \bcn to assign the optical phonons. The results showed that sintering temperature improves order while sintering time is not so efficient to promote order.
Cite
@article{arxiv.1304.0535,
title = {Ordering and phonons in Ba$_3$CaNb$_{2}$O$_9$ complex perovskite},
author = {João Elias Figueiredo Soares Rodrigues and Edvan Moreira and Débora Morais Bezerra and Adeilton Pereira Maciel and Carlos William de Araujo Paschoal},
journal= {arXiv preprint arXiv:1304.0535},
year = {2013}
}