1304.0535 (João Elias Figueiredo Soares Rodrigues et al.)

Ordering and phonons in Ba$_3$CaNb$_{2}$O$_9$ complex perovskite    [PDF]

João Elias Figueiredo Soares Rodrigues, Edvan Moreira, Débora Morais Bezerra, Adeilton Pereira Maciel, Carlos William de Araujo Paschoal

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.

View original: http://arxiv.org/abs/1304.0535